Re: RAID10 Balancing Request for Comments and Advices

Duncan
2015-06-18T04:38:21Z

Hugo Mills posted on Wed, 17 Jun 2015 13:27:36 +0000 as excerpted:

>> Yes, on this 80% full 6x4TB RAID10 -dusage=15 took 2 seconds and
>> relocated "0 out of 3026 chunks”.
>>
>> Out of curiosity, I had to use -dusage=90 to have it relocate only 1
>> chunk and it took les than 30 seconds.
>>
>> So I put a -dusage=25 in the weekly cron just before the scrub.
>
> In most cases, all you need to do is clean up one data chunk to
> give the metadata enough space to work in. Instead of manually iterating
> through several values of usage= until you get a useful response, you
> can use limit=<n> to stop after <n> successful block group relocations.

Thanks, Hugo. It wasn't previously clear to me what the practical usage
for the (relatively new) limit= filter was. Very useful explanation. =:^)

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"Every nonfree program has a lord, a master --
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