> On 6 Jul 2016, at 23:14, Corey Coughlin <corey.coughlin....@gmail.com> wrote: > > Hi all, > Hoping you all can help, have a strange problem, think I know what's going > on, but could use some verification. I set up a raid1 type btrfs filesystem > on an Ubuntu 16.04 system, here's what it looks like: > > btrfs fi show > Label: none uuid: 597ee185-36ac-4b68-8961-d4adc13f95d4 > Total devices 10 FS bytes used 3.42TiB > devid 1 size 1.82TiB used 1.18TiB path /dev/sdd > devid 2 size 698.64GiB used 47.00GiB path /dev/sdk > devid 3 size 931.51GiB used 280.03GiB path /dev/sdm > devid 4 size 931.51GiB used 280.00GiB path /dev/sdl > devid 5 size 1.82TiB used 1.17TiB path /dev/sdi > devid 6 size 1.82TiB used 823.03GiB path /dev/sdj > devid 7 size 698.64GiB used 47.00GiB path /dev/sdg > devid 8 size 1.82TiB used 1.18TiB path /dev/sda > devid 9 size 1.82TiB used 1.18TiB path /dev/sdb > devid 10 size 1.36TiB used 745.03GiB path /dev/sdh > > I added a couple disks, and then ran a balance operation, and that took about > 3 days to finish. When it did finish, tried a scrub and got this message: > > scrub status for 597ee185-36ac-4b68-8961-d4adc13f95d4 > scrub started at Sun Jun 26 18:19:28 2016 and was aborted after 01:16:35 > total bytes scrubbed: 926.45GiB with 18849935 errors > error details: read=18849935 > corrected errors: 5860, uncorrectable errors: 18844075, unverified errors: > 0 > > So that seems bad. Took a look at the devices and a few of them have errors: > ... > [/dev/sdi].generation_errs 0 > [/dev/sdj].write_io_errs 289436740 > [/dev/sdj].read_io_errs 289492820 > [/dev/sdj].flush_io_errs 12411 > [/dev/sdj].corruption_errs 0 > [/dev/sdj].generation_errs 0 > [/dev/sdg].write_io_errs 0 > ... > [/dev/sda].generation_errs 0 > [/dev/sdb].write_io_errs 3490143 > [/dev/sdb].read_io_errs 111 > [/dev/sdb].flush_io_errs 268 > [/dev/sdb].corruption_errs 0 > [/dev/sdb].generation_errs 0 > [/dev/sdh].write_io_errs 5839 > [/dev/sdh].read_io_errs 2188 > [/dev/sdh].flush_io_errs 11 > [/dev/sdh].corruption_errs 1 > [/dev/sdh].generation_errs 16373 > > So I checked the smart data for those disks, they seem perfect, no > reallocated sectors, no problems. But one thing I did notice is that they > are all WD Green drives. So I'm guessing that if they power down and get > reassigned to a new /dev/sd* letter, that could lead to data corruption. I > used idle3ctl to turn off the shut down mode on all the green drives in the > system, but I'm having trouble getting the filesystem working without the > errors. I tried a 'check --repair' command on it, and it seems to find a lot > of verification errors, but it doesn't look like things are getting fixed. > But I have all the data on it backed up on another system, so I can recreate > this if I need to. But here's what I want to know: > > 1. Am I correct about the issues with the WD Green drives, if they change > mounts during disk operations, will that corrupt data? I just wanted to chip in with WD Green drives. I have a RAID10 running on 6x2TB of those, actually had for ~3 years. If disk goes down for spin down, and you try to access something - kernel & FS & whole system will wait for drive to re-spin and everything works OK. I’ve never had a drive being reassigned to different /dev/sdX due to spin down / up. 2 years ago I was having a corruption due to not using ECC ram on my system and one of RAM modules started producing errors that were never caught up by CPU / MoBo. Long story short, guy here managed to point me to the right direction and I started shifting my data to hopefully new and not corrupted FS … but I was sceptical of similar issue that you have described AND I did raid1 and while mounted I did shift disk from one SATA port to another and FS managed to pick up the disk in new location and did not even blinked (as far as I remember there was syslog entry to say that disk vanished and then that disk was added)
Last word, you got plenty of errors in your SMART for transfer related stuff, please be advised that this may mean: - faulty cable - faulty mono controller - faulty drive controller - bad RAM - yes, mother board CAN use your ram for storing data and transfer related stuff … specially chapter ones. > 2. If that is the case: > a.) Is there any way I can stop the /dev/sd* mount points from changing? > Or can I set up the filesystem using UUIDs or something more solid? I > googled about it, but found conflicting info Don’t get it the wrong way but I’m personally surprised that anybody still uses mount points rather than UUID. Devices change from boot to boot for a lot of people and most of distros moved to uuid (2 years ago ? even the swap is mounted via UUID now) > b.) Or, is there something else changing my drive devices? I have most of > drives on an LSI SAS 9201-16i card, is there something I need to do to make > them fixed? I’ll let more senior data storage experts to speak up but most of the time people frowned on me for mentioning anything different than north bridge / Intel raid card / super micro / 3 ware . (And yes I did found the hard way they were right: - marvel controller on my mobo randomly writes garbage to your drives - adapted PCI express card was switching of all the drives mid flight while pretending “it’s OK” resulting in very peculiar data losses in the middle of big files) > c.) Or, is there a script or something I can use to figure out if the > disks will change mounts? > d.) Or, if I wipe everything and rebuild, will the disks with the idle3ctl > fix work now? > > Regardless of whether or not it's a WD Green drive issue, should I just > wipefs all the disks and rebuild it? Is there any way to recover this? > Thanks for any help! IF you remotelly care about the data that you have (I think you should if you came here), I would suggest a good exercise: - unplug all the drives you use for this file system and stop toying with it because you may loose more data (I did because I thought I knew better) - get your self 2 new drives - find my thread from ~2 years ago on this mailing list (might be different email address) - try to locate Chris Mason reply with a script “my old friend” - run this script on you system for couple of DAYS and you will see whenever you have any corruption creeping in - if corruptions are creeping in, change a component in your system (controller / RAM / mobo / CPU / PSU) and repeat exercise (best to organise your self access to some spare parts / extra machine. - when all is good, make and FS out of those 2 new drives, and try to rescue data from OLD FS ! - unplug new FS and put it one the shelf - try to fix old FS … this will be a FUN and very educating exercise … > > ------- Corey > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
