[zfs-discuss] Recommendation for home NAS external JBOD

2012-06-17 Thread Koopmann, Jan-Peter
Hi, my oi151 based home NAS is approaching a frightening drive space level. Right now the data volume is a 4*1TB Raid-Z1, 3 1/2 local disks individually connected to an 8 port LSI 6Gbit controller. So I can either exchange the disks one by one with autoexpand, use 2-4 TB disks and be happy.

Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-17 Thread Timothy Coalson
So I can either exchange the disks one by one with autoexpand, use 2-4 TB disks and be happy. This was my original approach. However I am totally unclear about the 512b vs 4Kb issue. What sata disk could I use that is big enough and still uses 512b? I know about the discussion about the

Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-17 Thread Jim Klimov
2012-06-17 19:11, Koopmann, Jan-Peter пишет: Hi, my oi151 based home NAS is approaching a frightening drive space level. Right now the data volume is a 4*1TB Raid-Z1, 3 1/2 local disks individually connected to an 8 port LSI 6Gbit controller. So I can either exchange the disks one by one with

Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-17 Thread Daniel Carosone
On Sun, Jun 17, 2012 at 03:19:18PM -0500, Timothy Coalson wrote: Replacing devices will not change the ashift, it is set permanently when a vdev is created, and zpool will refuse to replace a device in an ashift=9 vdev with a device that it would use ashift=12 on. Yep. [..] while hitachi

Re: [zfs-discuss] Occasional storm of xcalls on segkmem_zio_free

2012-06-17 Thread Sašo Kiselkov
On 06/13/2012 03:43 PM, Roch wrote: Sašo Kiselkov writes: On 06/12/2012 05:37 PM, Roch Bourbonnais wrote: So the xcall are necessary part of memory reclaiming, when one needs to tear down the TLB entry mapping the physical memory (which can from here on be repurposed). So

Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-17 Thread Koopmann, Jan-Peter
Hi Tim, thanks to you and the others for answering. worst case). The worst case for 512 emulated sectors on zfs is probably small (4KB or so) synchronous writes (which if they mattered to you, you would probably have a separate log device, in which case the data disk write penalty may not

Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-17 Thread Carson Gaspar
On 6/17/12 3:21 PM, Koopmann, Jan-Peter wrote: Hi Tim, you might be able to use an adapter to the SFF-8088 external 4 lane SAS connector, which may increase your options. So what you are saying is that something like this will do the trick?

Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-17 Thread Timothy Coalson
worst case).  The worst case for 512 emulated sectors on zfs is probably small (4KB or so) synchronous writes (which if they mattered to you, you would probably have a separate log device, in which case the data disk write penalty may not matter). Good to know. This really opens up the

Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-17 Thread Carson Gaspar
On 6/17/12 6:36 PM, Timothy Coalson wrote: No problem, and yes, I think that should work. One thing to keep in mind, though, is that if the internals of the enclosure simply split the multilane SAS cable into 4 connectors without an expander, and you use SATA drives, the controller will use