[zfs-discuss] System started crashing hard after zpool reconfigure and OI upgrade
I have two identical Supermicro boxes with 32GB ram. Hardware details at the end of the message. They were running OI 151.a.5 for months. The zpool configuration was one storage zpool with 3 vdevs of 8 disks in RAIDZ2. The OI installation is absolutely clean. Just next-next-next until done. All I do is configure the network after install. I don't install or enable any other services. Then I added more disks and rebuild the systems with OI 151.a.7 and this time configured the zpool with 6 vdevs of 5 disks in RAIDZ. The systems started crashing really bad. They just disappear from the network, black and unresponsive console, no error lights but no activity indication either. The only way out is to power cycle the system. There is no pattern in the crashes. It may crash in 2 days in may crash in 2 hours. I upgraded the memory on both systems to 128GB at no avail. This is the max memory they can take. In summary all I did is upgrade to OI 151.a.7 and reconfigured zpool. Any idea what could be the problem. Thank you -- Peter Supermicro X9DRH-iF Xeon E5-2620 @ 2.0 GHz 6-Core LSI SAS9211-8i HBA 32x 3TB Hitachi HUS723030ALS640, SAS, 7.2K ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] System started crashing hard after zpool reconfigure and OI upgrade
I'm sorry. I should have mentioned it that I can't find any errors in the logs. The last entry in /var/adm/messages is that I removed the keyboard after the last reboot and then it shows the new boot up messages when I boot up the system after the crash. The BIOS log is empty. I'm not sure how to check the IPMI but IPMI is not configured and I'm not using it. Just another observation - the crashes are more intense the more data the system serves (NFS). I'm looking into FRMW upgrades for the LSI now. On Wed, Mar 20, 2013 at 8:40 AM, Will Murnane will.murn...@gmail.comwrote: Does the Supermicro IPMI show anything when it crashes? Does anything show up in event logs in the BIOS, or in system logs under OI? On Wed, Mar 20, 2013 at 11:34 AM, Peter Wood peterwood...@gmail.comwrote: I have two identical Supermicro boxes with 32GB ram. Hardware details at the end of the message. They were running OI 151.a.5 for months. The zpool configuration was one storage zpool with 3 vdevs of 8 disks in RAIDZ2. The OI installation is absolutely clean. Just next-next-next until done. All I do is configure the network after install. I don't install or enable any other services. Then I added more disks and rebuild the systems with OI 151.a.7 and this time configured the zpool with 6 vdevs of 5 disks in RAIDZ. The systems started crashing really bad. They just disappear from the network, black and unresponsive console, no error lights but no activity indication either. The only way out is to power cycle the system. There is no pattern in the crashes. It may crash in 2 days in may crash in 2 hours. I upgraded the memory on both systems to 128GB at no avail. This is the max memory they can take. In summary all I did is upgrade to OI 151.a.7 and reconfigured zpool. Any idea what could be the problem. Thank you -- Peter Supermicro X9DRH-iF Xeon E5-2620 @ 2.0 GHz 6-Core LSI SAS9211-8i HBA 32x 3TB Hitachi HUS723030ALS640, SAS, 7.2K ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] System started crashing hard after zpool reconfigure and OI upgrade
I'm going to need some help with the crash dumps. I'm not very familiar with Solaris. Do I have to enable something to get the crash dumps? Where should I look for them? Thanks for the help. On Wed, Mar 20, 2013 at 8:53 AM, Michael Schuster michaelspriv...@gmail.com wrote: How about crash dumps? michael On Wed, Mar 20, 2013 at 4:50 PM, Peter Wood peterwood...@gmail.comwrote: I'm sorry. I should have mentioned it that I can't find any errors in the logs. The last entry in /var/adm/messages is that I removed the keyboard after the last reboot and then it shows the new boot up messages when I boot up the system after the crash. The BIOS log is empty. I'm not sure how to check the IPMI but IPMI is not configured and I'm not using it. Just another observation - the crashes are more intense the more data the system serves (NFS). I'm looking into FRMW upgrades for the LSI now. On Wed, Mar 20, 2013 at 8:40 AM, Will Murnane will.murn...@gmail.comwrote: Does the Supermicro IPMI show anything when it crashes? Does anything show up in event logs in the BIOS, or in system logs under OI? On Wed, Mar 20, 2013 at 11:34 AM, Peter Wood peterwood...@gmail.comwrote: I have two identical Supermicro boxes with 32GB ram. Hardware details at the end of the message. They were running OI 151.a.5 for months. The zpool configuration was one storage zpool with 3 vdevs of 8 disks in RAIDZ2. The OI installation is absolutely clean. Just next-next-next until done. All I do is configure the network after install. I don't install or enable any other services. Then I added more disks and rebuild the systems with OI 151.a.7 and this time configured the zpool with 6 vdevs of 5 disks in RAIDZ. The systems started crashing really bad. They just disappear from the network, black and unresponsive console, no error lights but no activity indication either. The only way out is to power cycle the system. There is no pattern in the crashes. It may crash in 2 days in may crash in 2 hours. I upgraded the memory on both systems to 128GB at no avail. This is the max memory they can take. In summary all I did is upgrade to OI 151.a.7 and reconfigured zpool. Any idea what could be the problem. Thank you -- Peter Supermicro X9DRH-iF Xeon E5-2620 @ 2.0 GHz 6-Core LSI SAS9211-8i HBA 32x 3TB Hitachi HUS723030ALS640, SAS, 7.2K ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss -- Michael Schuster http://recursiveramblings.wordpress.com/ ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] System started crashing hard after zpool reconfigure and OI upgrade
Hi Jim, Thanks for the pointers. I'll definitely look into this. -- Peter Blajev IT Manager, TAAZ Inc. Office: 858-597-0512 x125 On Wed, Mar 20, 2013 at 11:29 AM, Jim Klimov jimkli...@cos.ru wrote: On 2013-03-20 17:15, Peter Wood wrote: I'm going to need some help with the crash dumps. I'm not very familiar with Solaris. Do I have to enable something to get the crash dumps? Where should I look for them? Typically the kernel crash dumps are created as a result of kernel panic; also they may be forced by administrative actions like NMI. They require you to configure a dump volume of sufficient size (see dumpadm) and a /var/crash which may be a dataset on a large enough pool - after the reboot the dump data will be migrated there. To help with the hangs you can try the BIOS watchdog (which would require a bmc driver, one which is known from OpenSolaris is alas not opensourced and not redistributable), or with a software deadman timer: http://www.cuddletech.com/**blog/pivot/entry.php?id=1044http://www.cuddletech.com/blog/pivot/entry.php?id=1044 http://wiki.illumos.org/**display/illumos/System+Hangshttp://wiki.illumos.org/display/illumos/System+Hangs Also, if you configure crash dump on NMI and set up your IPMI card, then you can likely gain remote access to both the server console (physical and/or serial) and may be able to trigger the NMI, too. HTH, //Jim Thanks for the help. On Wed, Mar 20, 2013 at 8:53 AM, Michael Schuster michaelspriv...@gmail.com mailto:michaelsprivate@gmail.**commichaelspriv...@gmail.com wrote: How about crash dumps? michael On Wed, Mar 20, 2013 at 4:50 PM, Peter Wood peterwood...@gmail.com mailto:peterwood...@gmail.com** wrote: I'm sorry. I should have mentioned it that I can't find any errors in the logs. The last entry in /var/adm/messages is that I removed the keyboard after the last reboot and then it shows the new boot up messages when I boot up the system after the crash. The BIOS log is empty. I'm not sure how to check the IPMI but IPMI is not configured and I'm not using it. Just another observation - the crashes are more intense the more data the system serves (NFS). I'm looking into FRMW upgrades for the LSI now. On Wed, Mar 20, 2013 at 8:40 AM, Will Murnane will.murn...@gmail.com mailto:will.murn...@gmail.com** wrote: Does the Supermicro IPMI show anything when it crashes? Does anything show up in event logs in the BIOS, or in system logs under OI? On Wed, Mar 20, 2013 at 11:34 AM, Peter Wood peterwood...@gmail.com mailto:peterwood...@gmail.com** wrote: I have two identical Supermicro boxes with 32GB ram. Hardware details at the end of the message. They were running OI 151.a.5 for months. The zpool configuration was one storage zpool with 3 vdevs of 8 disks in RAIDZ2. The OI installation is absolutely clean. Just next-next-next until done. All I do is configure the network after install. I don't install or enable any other services. Then I added more disks and rebuild the systems with OI 151.a.7 and this time configured the zpool with 6 vdevs of 5 disks in RAIDZ. The systems started crashing really bad. They just disappear from the network, black and unresponsive console, no error lights but no activity indication either. The only way out is to power cycle the system. There is no pattern in the crashes. It may crash in 2 days in may crash in 2 hours. I upgraded the memory on both systems to 128GB at no avail. This is the max memory they can take. In summary all I did is upgrade to OI 151.a.7 and reconfigured zpool. Any idea what could be the problem. Thank you -- Peter Supermicro X9DRH-iF Xeon E5-2620 @ 2.0 GHz 6-Core LSI SAS9211-8i HBA 32x 3TB Hitachi HUS723030ALS640, SAS, 7.2K __**_ zfs-discuss mailing list zfs-discuss@opensolaris.org mailto:zfs-discuss@**opensolaris.orgzfs-discuss@opensolaris.org http://mail.opensolaris.org/** mailman/listinfo/zfs-discusshttp://mail.opensolaris.org/mailman/listinfo/zfs-discuss __**_ zfs-discuss mailing list zfs-discuss@opensolaris.org mailto:zfs-discuss@**opensolaris.orgzfs-discuss
Re: [zfs-discuss] [BULK] System started crashing hard after zpool reconfigure and OI upgrade
No problem Trey. Anything will help. Yes, I did a clean install overwriting the old OS. Just to make sure, you actually did an overwrite reinstall with OI151a7 rather than upgrading the existing OS images? If you did a pkg image-update, you should be able to boot back into the oi151a5 image from grub. Apologies in advance if I'm stating the obvious. -- Trey On Mar 20, 2013, at 11:34 AM, Peter Wood peterwood...@gmail.com wrote: I have two identical Supermicro boxes with 32GB ram. Hardware details at the end of the message. They were running OI 151.a.5 for months. The zpool configuration was one storage zpool with 3 vdevs of 8 disks in RAIDZ2. The OI installation is absolutely clean. Just next-next-next until done. All I do is configure the network after install. I don't install or enable any other services. Then I added more disks and rebuild the systems with OI 151.a.7 and this time configured the zpool with 6 vdevs of 5 disks in RAIDZ. The systems started crashing really bad. They just disappear from the network, black and unresponsive console, no error lights but no activity indication either. The only way out is to power cycle the system. There is no pattern in the crashes. It may crash in 2 days in may crash in 2 hours. I upgraded the memory on both systems to 128GB at no avail. This is the max memory they can take. In summary all I did is upgrade to OI 151.a.7 and reconfigured zpool. Any idea what could be the problem. Thank you -- Peter Supermicro X9DRH-iF Xeon E5-2620 @ 2.0 GHz 6-Core LSI SAS9211-8i HBA 32x 3TB Hitachi HUS723030ALS640, SAS, 7.2K ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] System started crashing hard after zpool reconfigure and OI upgrade
Great write up Jens. The chance of two MB to be broken is probably low but overheating is a very good point. It was on my to-do list to setup IPMI and seems that now is the best time to do it. Thanks On Wed, Mar 20, 2013 at 1:08 PM, Jens Elkner jel+...@cs.uni-magdeburg.dewrote: On Wed, Mar 20, 2013 at 08:50:40AM -0700, Peter Wood wrote: I'm sorry. I should have mentioned it that I can't find any errors in the logs. The last entry in /var/adm/messages is that I removed the keyboard after the last reboot and then it shows the new boot up messages when I boot up the system after the crash. The BIOS log is empty. I'm not sure how to check the IPMI but IPMI is not configured and I'm not using it. You definitely should! Plugin a cable into the dedicated network port and configure it (easiest way for you is probably to jump into the BIOS and assign the appropriate IP address etc.). Than, for a quick look, point your browser to the given IP port 80 (default login is ADMIN/ADMIN). Also you may now configure some other details (accounts/passwords/roles). To track the problem, either write a script, which polls the parameters in question periodically or just install the latest ipmiViewer and use this to monitor your sensors ad hoc. see ftp://ftp.supermicro.com/utility/IPMIView/ Just another observation - the crashes are more intense the more data the system serves (NFS). I'm looking into FRMW upgrades for the LSI now. Latest LSI FW should be P15, for this MB type 217 (2.17), MB-BIOS C28 (1.0b). However, I doubt, that your problem has anything to do with the SAS-ctrl or OI or ZFS. My guess is, that either your MB is broken (we had an X9DRH-iF, which instantly disappeared as soon as it got some real load) or you have a heat problem (watch you cpu temp e.g. via ipmiviewer). With 2GHz that's not very likely, but worth a try (socket placement on this board is not really smart IMHO). To test quickly - disable all addtional, unneeded service in OI, which may put some load on the machine (like NFS service, http and bla) and perhaps even export unneeded pools (just to be sure) - fire up your ipmiviewer and look at the sensors (set update to 10s) or refresh manually often - start 'openssl speed -multi 32' and keep watching your cpu temp sensors (with 2GHz I guess it takes ~ 12min) I guess, your machine disappears before the CPUs getting really hot (broken MB). If CPUs switch off (usually first CPU2 and a little bit later CPU1) you have a cooling problem. If nothing happens, well, than it could be an OI or ZFS problem ;-) Have fun, jel. -- Otto-von-Guericke University http://www.cs.uni-magdeburg.de/ Department of Computer Science Geb. 29 R 027, Universitaetsplatz 2 39106 Magdeburg, Germany Tel: +49 391 67 52768 ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] System started crashing hard after zpool reconfigure and OI upgrade
I can reproduce the problem. I can crash the system. Here are the steps I did (some steps may not be needed but I haven't tested it): - Clean install of OI 151.a.7 on Supermicro hardware described above (32GB RAM though, not the 128GB) - Create 1 zpool, 6 raidz vdevs with 5 drives each - NFS export a dataset zfs set sharenfs=rw=@10.20.1/24 vol01/htmlspace - Create zfs child dataset zfs create vol01/htmlspace/A $ zfs get -H sharenfs vol01/htmlspace/A vol01/htmlspace/A sharenfsrw=@10.20.1/24 inherited from vol01/htmlspace - Stop NFS shearing for the child dataset zfs set sharenfs=off vol01/htmlspace/A The crash is instant after the sharenfs=off command. I thought it was coincident so after reboot I tried it on another dataset. Instant crash again. I get my prompt back but that's it. The system is gone after that. The NFS exported file systems are not accessed by any system on the network. They are not in use. That's why I wanted to stop exporting them. And, even if they were in use this should now crash the system, right? I can't try the other box because it is heavy in production. At least not until later tonight. I thought I'll collect some advice to make each crash as useful as possible. Any pointers are appreciated. Thanks, -- Peter On Wed, Mar 20, 2013 at 8:34 AM, Peter Wood peterwood...@gmail.com wrote: I have two identical Supermicro boxes with 32GB ram. Hardware details at the end of the message. They were running OI 151.a.5 for months. The zpool configuration was one storage zpool with 3 vdevs of 8 disks in RAIDZ2. The OI installation is absolutely clean. Just next-next-next until done. All I do is configure the network after install. I don't install or enable any other services. Then I added more disks and rebuild the systems with OI 151.a.7 and this time configured the zpool with 6 vdevs of 5 disks in RAIDZ. The systems started crashing really bad. They just disappear from the network, black and unresponsive console, no error lights but no activity indication either. The only way out is to power cycle the system. There is no pattern in the crashes. It may crash in 2 days in may crash in 2 hours. I upgraded the memory on both systems to 128GB at no avail. This is the max memory they can take. In summary all I did is upgrade to OI 151.a.7 and reconfigured zpool. Any idea what could be the problem. Thank you -- Peter Supermicro X9DRH-iF Xeon E5-2620 @ 2.0 GHz 6-Core LSI SAS9211-8i HBA 32x 3TB Hitachi HUS723030ALS640, SAS, 7.2K ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Is there performance penalty when adding vdev to existing pool
I'm using OpenIndiana 151a7, zpool v28, zfs v5. When I bought my storage servers I intentionally left hdd slots available so I can add another vdev when needed and delay immediate expenses. After reading some posts on the mailing list I'm getting concerned about degrading performance due to unequal distribution of data among the vdevs. I still have a chance to migrate the data away, add all drives and rebuild the pools and start fresh. Before going that road I was hoping to hear your opinion on what will be the best way to handle this. System: Supermicro with 36 hdd bays. 28 bays filled with 3TB SAS 7.2K enterprise drives. 8 bays available to add another vdev to the pool. Pool configuration: # zpool status pool01 pool: pool01 state: ONLINE scan: scrub repaired 0 in 0h0m with 0 errors on Wed Nov 21 17:41:52 2012 config: NAME STATE READ WRITE CKSUM pool01 ONLINE 0 0 0 raidz2-0 ONLINE 0 0 0 c8t5000CCA01AA8E3C0d0 ONLINE 0 0 0 c8t5000CCA01AA8E3F0d0 ONLINE 0 0 0 c8t5000CCA01AA8E394d0 ONLINE 0 0 0 c8t5000CCA01AA8E434d0 ONLINE 0 0 0 c8t5000CCA01AA793A0d0 ONLINE 0 0 0 c8t5000CCA01AA79380d0 ONLINE 0 0 0 c8t5000CCA01AA79398d0 ONLINE 0 0 0 c8t5000CCA01AB56B10d0 ONLINE 0 0 0 raidz2-1 ONLINE 0 0 0 c8t5000CCA01AB56B28d0 ONLINE 0 0 0 c8t5000CCA01AB56B64d0 ONLINE 0 0 0 c8t5000CCA01AB56B80d0 ONLINE 0 0 0 c8t5000CCA01AB56BB0d0 ONLINE 0 0 0 c8t5000CCA01AB56EA4d0 ONLINE 0 0 0 c8t5000CCA01ABDAEBCd0 ONLINE 0 0 0 c8t5000CCA01ABDAED0d0 ONLINE 0 0 0 c8t5000CCA01ABDAF1Cd0 ONLINE 0 0 0 raidz2-2 ONLINE 0 0 0 c8t5000CCA01ABDAF7Cd0 ONLINE 0 0 0 c8t5000CCA01ABDAF10d0 ONLINE 0 0 0 c8t5000CCA01ABDAF40d0 ONLINE 0 0 0 c8t5000CCA01ABDAF60d0 ONLINE 0 0 0 c8t5000CCA01ABDAF74d0 ONLINE 0 0 0 c8t5000CCA01ABDAF80d0 ONLINE 0 0 0 c8t5000CCA01ABDB04Cd0 ONLINE 0 0 0 c8t5000CCA01ABDB09Cd0 ONLINE 0 0 0 logs mirror-3 ONLINE 0 0 0 c6t0d0 ONLINE 0 0 0 c6t1d0 ONLINE 0 0 0 cache c6t2d0 ONLINE 0 0 0 c6t3d0 ONLINE 0 0 0 spares c8t5000CCA01ABDB020d0AVAIL c8t5000CCA01ABDB060d0AVAIL errors: No known data errors # Will adding another vdev hurt the performance? Thank you, -- Peter ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Is there performance penalty when adding vdev to existing pool
Currently the pool is about 20% full: # zpool list pool01 NAME SIZE ALLOC FREE EXPANDSZCAP DEDUP HEALTH ALTROOT pool01 65.2T 15.4T 49.9T -23% 1.00x ONLINE - # The old data and new data will be equally use after adding the vdev. The FS hold tens of thousands of small images (~500KB) that are read, write and new one added depending on what customers are doing. It's pretty heavy on the file system. About 800 IOPS going up to 1500 IOPS at times. Performance is important. On Wed, Feb 20, 2013 at 3:48 PM, Tim Cook t...@cook.ms wrote: On Wed, Feb 20, 2013 at 5:46 PM, Bob Friesenhahn bfrie...@simple.dallas.tx.us wrote: On Thu, 21 Feb 2013, Sašo Kiselkov wrote: On 02/21/2013 12:27 AM, Peter Wood wrote: Will adding another vdev hurt the performance? In general, the answer is: no. ZFS will try to balance writes to top-level vdevs in a fashion that assures even data distribution. If your data is equally likely to be hit in all places, then you will not incur any performance penalties. If, OTOH, newer data is more likely to be hit than old data , then yes, newer data will be served from fewer spindles. In that case it is possible to do a send/receive of the affected datasets into new locations and then renaming them. You have this reversed. The older data is served from fewer spindles than data written after the new vdev is added. Performance with the newer data should be improved. Bob That depends entirely on how full the pool is when the new vdev is added, and how frequently the older data changes, snapshots, etc. --Tim ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Heavy write IO for no apparent reason
I have a script that rotates hourly, daily and monthly snapshots. Each filesystem has about 40 snapshots (zfsList.png - output of 'zfs list | grep -v home/' - the home directories datasets are snipped from the output. 4 users in total.) I noticed that the hourly snapshots on the heaviest filesystem in use are about 1.2GB in size where on the other system the regular NFS exported filesystem has about 60MB snapshots (gallerySnapshots.png - output of command 'zfs list -t snapshot -r pool01/utils/gallery') I know that the gallery FS is in heavier use then normal but I was told it will be mostly reading and based on the iostat seems that there is heavy writing too. I guess I'll schedule some downtime and disable gallery export and see if that will effect the number of write operations and performance in general. Unless there is some other way to test what/where these write operations are applied. The 'zpool iostat -v' output is uncomfortably static. The values of read/write operations and bandwidth are the same for hours and even days. I'd expect at least some variations between morning and night. The load on the servers is different for sure. Any input? Thanks, -- Peter On Wed, Jan 16, 2013 at 7:49 PM, Bob Friesenhahn bfrie...@simple.dallas.tx.us wrote: On Wed, 16 Jan 2013, Peter Wood wrote: Running zpool iostat -v (attachment zpool-IOStat.png) shows 1,22K write operations on the drives and 661 on the ZIL. Compare to the other server (who is in way heavier use then this one) these numbers are extremely high. Any idea how to debug any further? Do some filesystems contain many snapshots? Do some filesystems use small zfs block sizes. Have the servers been used the same? Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/** users/bfriesen/ http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer,http://www.GraphicsMagick.org/ ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Heavy write IO for no apparent reason
Right on Tim. Thanks. I didn't know that. I'm sure it's documented somewhere and I should have read it so double thanks for explaining it. On Thu, Jan 17, 2013 at 4:18 PM, Timothy Coalson tsc...@mst.edu wrote: On Thu, Jan 17, 2013 at 5:33 PM, Peter Wood peterwood...@gmail.comwrote: The 'zpool iostat -v' output is uncomfortably static. The values of read/write operations and bandwidth are the same for hours and even days. I'd expect at least some variations between morning and night. The load on the servers is different for sure. Any input? Without a repetition time parameter, zpool iostat will print exactly once and exit, and the output is an average from kernel boot to now, just like iostat, this is why it seems so static. If you want to know the activity over 5 second intervals, use something like zpool iostat -v 5 (repeat every 5 seconds) and wait for the second and later blocks. The second and later blocks are average from previous output until now. I generally use 5 second intervals to match the 5 second commit interval on my pools. Tim ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Heavy write IO for no apparent reason
Great points Jim. I have requested more information how the gallery share is being used and any temporary data will be moved out of there. About atime, it is set to on right now and I've considered to turn it off but I wasn't sure if this will effect incremental zfs send/receive. 'zfs send -i snapshot0 snapshot1' doesn't rely on the atime, right? On Thu, Jan 17, 2013 at 4:34 PM, Jim Klimov jimkli...@cos.ru wrote: On 2013-01-18 00:42, Bob Friesenhahn wrote: You can install Brendan Gregg's DTraceToolkit and use it to find out who and what is doing all the writing. 1.2GB in an hour is quite a lot of writing. If this is going continuously, then it may be causing more fragmentation in conjunction with your snapshots. As a moderately wild guess, since you're speaking of galleries, are these problematic filesystems often-read? By default ZFS updates the last access-time of files it reads, as do many other filesystems, and this causes avalanches of metadata updates - sync writes (likely) as well as fragmentation. This may also be a poorly traceable but considerable used space in frequent snapshots. You can verify (and unset) this behaviour with the ZFS FS dataset property atime, i.e.: # zfs get atime pond/export/home NAME PROPERTY VALUE SOURCE pond/export/home atime offinherited from pond On another hand, verify where your software keeps the temporary files (i.e. during uploads as may be with galleries). Again, if this is a frequently snapshotted dataset (though 1 hour is not really that frequent) then needless temp files can be held by those older snapshots. Moving such temporary works to a different dataset with a different snapshot schedule and/or to a different pool (to keep related fragmentation constrained) may prove useful. HTH, //Jim Klimov __**_ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/**mailman/listinfo/zfs-discusshttp://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Replacing root pool disk
Hi, I was following the instructions in ZFS Troubleshooting Guide on how to replace a disk in the root pool on x86 system. I'm using OpenIndiana, ZFS pool v.28 with mirrored system rpool. The replacement disk is brand new. root:~# zpool status pool: rpool state: DEGRADED status: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. Applications are unaffected. action: Determine if the device needs to be replaced, and clear the errors using 'zpool clear' or replace the device with 'zpool replace'. see: http://www.sun.com/msg/ZFS-8000-9P scan: resilvered 17.6M in 0h0m with 0 errors on Wed Apr 11 17:45:16 2012 config: NAME STATE READ WRITE CKSUM rpoolDEGRADED 0 0 0 mirror-0 DEGRADED 0 0 0 c2t5000CCA369C55DB8d0s0 OFFLINE 0 126 0 c2t5000CCA369D5231Cd0s0 ONLINE 0 0 0 errors: No known data errors root:~# I'm not very familiar with Solaris partitions and slices so somewhere in the format/partition commands I must to have made a mistake because when I try to replace the disk I'm getting the following error: root:~# zpool replace rpool c2t5000CCA369C55DB8d0s0 c2t5000CCA369C89636d0s0 invalid vdev specification use '-f' to override the following errors: /dev/dsk/c2t5000CCA369C89636d0s0 overlaps with /dev/dsk/c2t5000CCA369C89636d0s2 root:~# I used -f and it worked but I was wondering is there a way to completely reset the new disk? Remove all partitions and start from scratch. Thank you Peter ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Replacing root pool disk
Thank you all for the replies. I'll try the suggested solutions. -- Peter On Thu, Apr 12, 2012 at 2:06 PM, Roberto Waltman li...@rwaltman.com wrote: Cindy Swearingen wrote: We don't yet have an easy way to clear a disk label, ... dd if=/dev/zero of=... on the 1st and last 10% (roughly) of the disk has worked fine for me. -- Roberto Waltman __**_ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/**mailman/listinfo/zfs-discusshttp://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
