Speeding up resilvering

[Karl Denninger]

On 7/8/2015 08:50, Matthew Seaman wrote:
> Hi,
>
> I've a zpool which is taking an inordinately long time to resilver and
> replace a device.  It had only got to about 8% completion after a day,
> implying over a week to resilver about 6TB data.
>
> Now, I've applied the resilver performance tuning sysctls from
> https://wiki.freebsd.org/ZFSTuningGuide:
>
> vfs.zfs.scrub_delay=0
> vfs.zfs.top_maxinflight=128
> vfs.zfs.resilver_min_time_ms=5000
> vfs.zfs.resilver_delay=0
>
> but it doesn't seem to have made a great deal of difference.  Most of
> the benefit there would apparently come from reducing scrub_delay or
> resilver_delay -- but this system is only booted to single user mode, so
> the drives are otherwise idle and the resilver should have automatically
> switched to running full throttle anyhow.
>
> Given the machine is not going to be doing anything else other than
> resilvering for the time being, is there any more aggressive tuning or
> tricks to get it to go faster that people would recommend?
>
> 	Cheers,
>
> 	Matthew
>

What OS version?

-- 
Karl Denninger
karl at denninger.net <mailto:karl at denninger.net>
/The Market Ticker/
/[S/MIME encrypted email preferred]/
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