Re: [zfs-discuss] Best practice for Sol10U9 ZIL -- mirrored or not?

2010-09-18 Thread Neil Perrin
On 09/17/10 23:31, Ian Collins wrote: On 09/18/10 04:46 PM, Neil Perrin wrote: On 09/17/10 18:32, Edward Ned Harvey wrote: From: Neil Perrin [mailto:neil.per...@oracle.com] you lose information. Not your whole pool. You lose up to 30 sec of writes The default is now 5

Re: [zfs-discuss] Best practice for Sol10U9 ZIL -- mirrored or not?

2010-09-17 Thread Edward Ned Harvey
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- boun...@opensolaris.org] On Behalf Of Bryan Horstmann-Allen The ability to remove the slogs isn't really the win here, it's import -F. The Disagree. Although I agree the -F is important and good, I think the log device removal

Re: [zfs-discuss] Best practice for Sol10U9 ZIL -- mirrored or not?

2010-09-17 Thread David Magda
On Sep 17, 2010, at 20:32, Edward Ned Harvey wrote: When did that become default? Should I *ever* say 30 sec anymore? June 8, 2010, revision 12586:b118bbd65be9: http://src.opensolaris.org/source/history/onnv/onnv-gate/usr/src/uts/common/fs/zfs/txg.c

Re: [zfs-discuss] Best practice for Sol10U9 ZIL -- mirrored or not?

2010-09-17 Thread Neil Perrin
On 09/17/10 18:32, Edward Ned Harvey wrote: From: Neil Perrin [mailto:neil.per...@oracle.com] you lose information. Not your whole pool. You lose up to 30 sec of writes The default is now 5 seconds (zfs_txg_timeout). When did that become default? It was changed more

Re: [zfs-discuss] Best practice for Sol10U9 ZIL -- mirrored or not?

2010-09-17 Thread Ian Collins
On 09/18/10 04:46 PM, Neil Perrin wrote: On 09/17/10 18:32, Edward Ned Harvey wrote: From: Neil Perrin [mailto:neil.per...@oracle.com] you lose information. Not your whole pool. You lose up to 30 sec of writes The default is now 5 seconds (zfs_txg_timeout). When did

[zfs-discuss] Best practice for Sol10U9 ZIL -- mirrored or not?

2010-09-16 Thread Ray Van Dolson
Best practice in Solaris 10 U8 and older was to use a mirrored ZIL. With the ability to remove slog devices in Solaris 10 U9, we're thinking we may get more bang for our buck to use two slog devices for improved IOPS performance instead of needing the redundancy so much. Any thoughts on this?

Re: [zfs-discuss] Best practice for Sol10U9 ZIL -- mirrored or not?

2010-09-16 Thread Bryan Horstmann-Allen
+-- | On 2010-09-16 18:08:46, Ray Van Dolson wrote: | | Best practice in Solaris 10 U8 and older was to use a mirrored ZIL. | | With the ability to remove slog devices in Solaris 10 U9, we're | thinking we may get more