Speeding up resilvering

[Matthew Seaman]

On 2015/07/08 14:58, Karl Denninger wrote:
> 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?
> 

10.1-RELEASE-p10

	Cheers,

	Matthew


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