Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-22 Thread Stephan Budach
Am 22.04.16 um 19:28 schrieb Dan McDonald: On Apr 22, 2016, at 1:13 PM, Richard Elling wrote: If you're running Solaris 11 or pre-2015 OmniOS, then the old write throttle is impossible to control and you'll chase your tail trying to balance scrubs/resilvers against any other workload. From a

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-22 Thread Dan McDonald
> On Apr 22, 2016, at 1:13 PM, Richard Elling > wrote: > > If you're running Solaris 11 or pre-2015 OmniOS, then the old write throttle > is impossible > to control and you'll chase your tail trying to balance scrubs/resilvers > against any other > workload. From a control theory perspective,

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-22 Thread Richard Elling
> On Apr 22, 2016, at 10:28 AM, Dan McDonald wrote: > > >> On Apr 22, 2016, at 1:13 PM, Richard Elling >> wrote: >> >> If you're running Solaris 11 or pre-2015 OmniOS, then the old write throttle >> is impossible >> to control and you'll chase your tail trying to balance scrubs/resilvers >

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-22 Thread Richard Elling
> On Apr 22, 2016, at 5:00 AM, Stephan Budach wrote: > > Am 21.04.16 um 18:36 schrieb Richard Elling: >>> On Apr 21, 2016, at 7:47 AM, Chris Siebenmann wrote: >>> >>> [About ZFS scrub tunables:] Interesting read - and it surely works. If you set the tunable before you start the scrub

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-22 Thread Stephan Budach
Am 21.04.16 um 18:36 schrieb Richard Elling: On Apr 21, 2016, at 7:47 AM, Chris Siebenmann wrote: [About ZFS scrub tunables:] Interesting read - and it surely works. If you set the tunable before you start the scrub you can immediately see the thoughput being much higher than with the standard

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-21 Thread Richard Elling
> On Apr 21, 2016, at 7:47 AM, Chris Siebenmann wrote: > > [About ZFS scrub tunables:] >> Interesting read - and it surely works. If you set the tunable before >> you start the scrub you can immediately see the thoughput being much >> higher than with the standard setting. [...] > > It's perhap

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-21 Thread Chris Siebenmann
[About ZFS scrub tunables:] > Interesting read - and it surely works. If you set the tunable before > you start the scrub you can immediately see the thoughput being much > higher than with the standard setting. [...] It's perhaps worth noting here that the scrub rate shown in 'zpool status' is a

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-21 Thread Stephan Budach
Am 19.04.16 um 23:31 schrieb wuffers: You might want to check this old thread: http://lists.omniti.com/pipermail/omnios-discuss/2014-July/002927.html Richard Elling had some interesting insights on how the scrub works: "So I think the pool is not scheduling scrub I/Os very well. You can incre

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-19 Thread wuffers
You might want to check this old thread: http://lists.omniti.com/pipermail/omnios-discuss/2014-July/002927.html Richard Elling had some interesting insights on how the scrub works: "So I think the pool is not scheduling scrub I/Os very well. You can increase the number of scrub I/Os in the sched

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-17 Thread Stephan Budach
Am 17.04.16 um 20:42 schrieb Dale Ghent: On Apr 17, 2016, at 9:07 AM, Stephan Budach wrote: Well… searching the net somewhat more thoroughfully, I came across an archived discussion which deals also with a similar issue. Somewhere down the conversation, this parameter got suggested: echo "zf

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-17 Thread Dale Ghent
> On Apr 17, 2016, at 9:07 AM, Stephan Budach wrote: > > Well… searching the net somewhat more thoroughfully, I came across an > archived discussion which deals also with a similar issue. Somewhere down the > conversation, this parameter got suggested: > > echo "zfs_scrub_delay/W0" | mdb -kw

Re: [OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-17 Thread Stephan Budach
Am 17.04.16 um 14:07 schrieb Stephan Budach: Hi all, I am running a scrub on a SSD-only zpool on r018. This zpool consists of 16 iSCSI targets, which are served from two other OmniOS boxes - currently still running r016 over 10GbE connections. This zpool serves as a NFS share for my Oracle V

[OmniOS-discuss] Slow scrub on SSD-only pool

2016-04-17 Thread Stephan Budach
Hi all, I am running a scrub on a SSD-only zpool on r018. This zpool consists of 16 iSCSI targets, which are served from two other OmniOS boxes - currently still running r016 over 10GbE connections. This zpool serves as a NFS share for my Oracle VM cluster and it delivers reasonable performa