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List:       freebsd-fs
Subject:    Re: [developer] Re: [zfs] Re: April OpenZFS Leadership Meeting
From:       Igor Kozhukhov <igor () dilos ! org>
Date:       2019-04-24 16:19:07
Message-ID: 4C9A42C6-5024-4A87-A45C-A43A4562C3BA () dilos ! org
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> 
> For anecdotal experience regarding root pool compression, the issue was there with \
> older GRUB loader of OpenSolaris and contemporary Solaris 10; I believe it was \
> fixed in the illumos branch after the fork (can't find and point to a commit now, \
> possibly soon after lz4 introduction; no idea about state of later Solaris \
> releases). 
> The problem manifested by GRUB refusing to read datasets (rpool, rpool/ROOT, \
> rpool/ROOT/$BENAME) that had the compression enabled (even if no blocks were in \
> fact compressed) or disabled at the moment but compressed blocks encountered during \
> a read. 
> This was one of main reasons early on for my split-root support scripts, so /usr \
> could be separated into a gzip-9'ed dataset and shrink from ~3gb to ~1gb on a \
> default install. 
> On my current laptop I see rpool has compression=off, rpool/ROOT has lz4 and \
> rootfs(es) inherit that. Works well WRT stability and performance.

it is known issue with compression=on on rpool, but it is know working scenario for \
compression=on rpool/ROOT as dataset with root fs - it is working fine on Intel and \
SPARC it is why i tried to explain to: do not use compression=on on pool itself , but \
use it on dataset where root file system available = rpool/ROOT and inherit to BE in \
rpool/ROOT/*.

but my English is not good in this context.

-Igor

> 
> Hope this helps,
> Jim
> 
> --
> Typos courtesy of K-9 Mail on my Android
> 
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