Re: [zfs-discuss] ZFS - Sudden decrease in write performance

2010-12-02 Thread Louis Carreiro
That's for pointing me towards that site! Saying that "txg_synctime_ms" controls zfs's breathing was how I was thinking about it. Great way to describe it! Unfortunately setting txg_synctime_ms to 1000 or even 1 didn't make an improvement. I tried adding the "disable-ohci=true" to the GRUB boot me

Re: [zfs-discuss] ZFS - Sudden decrease in write performance

2010-11-21 Thread SR
This is probably the same write throttle issue which has been discussed to length on this list. Check the archives for zfs write throttle, especially posts from Jun-Jul 2009. Suresh -- This message posted from opensolaris.org ___ zfs-discuss mailing l

Re: [zfs-discuss] ZFS - Sudden decrease in write performance

2010-11-20 Thread Richard L. Hamilton
arc-discuss doesn't have anything specifically to do with ZFS; in particular, it has nothing to do with the ZFS ARC. Just an unfortunate overlap of acronyms. Cross-posted to zfs-discuss, where this probably belongs. > Hey all1 > > Recently I've decided to implement OpenSolaris as a > target fo

Re: [zfs-discuss] ZFS - Sudden decrease in write performance

2010-11-15 Thread Louis Carreiro
Almost! It seems like it held out a bit further than last time. Now "arcsz" hit's 2G (matching 'c'). But it still drops off. It started at 5.6GB/Min and fell off to less than 700MB/Min. A snippet of my arcstat.pl output looks like the following: Time read miss miss% dmis dm% pmis pm% mm

Re: [zfs-discuss] ZFS - Sudden decrease in write performance

2010-11-15 Thread Khushil Dep
Points to check are iostat,fsstat, zilstat, mpstat, prstat. Check for sw interrupt sharing, disable ohci. On 16 Nov 2010 00:27, "Khushil Dep" wrote: > That controls zfs breathing, I'm on a phone writing this so u hope you won't > mind me pointing you to > listware.net/201005/opensolaris-zfs/11556

Re: [zfs-discuss] ZFS - Sudden decrease in write performance

2010-11-15 Thread Khushil Dep
That controls zfs breathing, I'm on a phone writing this so u hope you won't mind me pointing you to listware.net/201005/opensolaris-zfs/115564-zfs-discuss-small-stalls-slowing-down-rsync-from-holding-network-saturation-every-5-seconds.html On 16 Nov 2010 00:20, "Louis Carreiro" wrote: Almost! It

Re: [zfs-discuss] ZFS - Sudden decrease in write performance

2010-11-15 Thread Khushil Dep
Set your txg_synctime_ms to 0x3000 and retest please? On 15 Nov 2010 23:23, "Louis" wrote: > Hey all1 > > Recently I've decided to implement OpenSolaris as a target for BackupExec. > > The server I've converted into a "Storage Appliance" is an IBM x3650 M2 w/ ~4TB of on board storage via ~10 loca

[zfs-discuss] ZFS - Sudden decrease in write performance

2010-11-15 Thread Louis
Hey all1 Recently I've decided to implement OpenSolaris as a target for BackupExec. The server I've converted into a "Storage Appliance" is an IBM x3650 M2 w/ ~4TB of on board storage via ~10 local SATA drives and I'm using OpenSolaris svn_134. I'm using a QLogic 4Gb FC HBA w/ the QLT driver an