Date: Sun, 24 Aug 2025 15:03:30 -0400 From: Chris Ross <cross+freebsd@distal.com> To: Frank Leonhardt <freebsd-doc@fjl.co.uk> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS pool balance and performance Message-ID: <0BDA4A7A-DF69-479F-AB13-C3DE34011F52@distal.com> In-Reply-To: <0cb58371-862f-4e14-821f-23eb51765ebf@fjl.co.uk> References: <D20FFFD1-12C8-45F7-879F-5575C62825EC@distal.com> <dcfdc2e0-21c5-4550-a19a-ccaec6d661c7@denninger.net> <2EFBFD1A-7015-44D7-BA4B-49379A6BD535@distal.com> <0cb58371-862f-4e14-821f-23eb51765ebf@fjl.co.uk>
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> On Aug 24, 2025, at 13:36, Frank Leonhardt <freebsd-doc@fjl.co.uk> wrote:
>>
>>
>> Yeah, google search suggested there isn’t any way to rebalance. Is there
>> a way I can identify which vdev files are on? If so, I could delete some
>> files that are principally on raidz1-1, which would help some.
>>
>
> My understanding is that files may be stored across all vdevs. I don't remember there being any restriction that says a file should be on exactly one vdev; it kind of defeats the point.
Yes, I believe the same. I was just wondering if there was a way to find
out if perhaps some files had a larger portion of their blocks on one vdev
or the other. The AI-summarized google search about that suggests I can
use zdb -dddd to get data from which I can extract that, but I haven’t
tried it yet so don’t know if it’s valid.
> I'm rather hoping someone working on current ZFS internals will come along and give a few definitive answers here!
Yup. Thanks.
- Chris
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