Bill Sommerfeld wrote:
> On Thu, 2008-06-05 at 23:04 +0300, Cyril Plisko wrote:
>
>> 1. Are there any reasons to *not* enable compression by default ?
>>
>
> Not exactly an answer:
>
> Most of the systems I'm running today on ZFS root have compression=on
> and copies=2 for rpool/ROOT
>
I've been experimenting with this, too, and will likely settle
on the same: copies=2, compression=on
IIRC, grub ZFS does lzjb, but not gzip
>> 2. How can I do it ? (I think I can run "zfs set compression=on
>> rpool/ROOT/snv_90" in the other window, right after the installation
>> begins, but I would like less hacky way.)
>>
>
> what I did was to migrate via live upgrade, creating the pool and the
> pool/ROOT filesystem myself, tweaking both copies and compression on
> pool/ROOT before using lucreate.
>
> I haven't tried this on a fresh install yet.
>
Two ways to do this from DVD/LiveCD:
1. change the parameters after the rpool is created, but before packages
are being installed. This can be a little tricky to get the
timing right,
especially for OpenSolaris -- it is easier with SXCE because
there is a
fair amount of time required to build the dump and swap volumes prior
to building the root file system. Anyway, I just open a terminal
window and type the appropriate zfs commands.
2. replace /sbin/zpool with a script that does what you want prior to
beginning the installation -- ugly but possible.
JumpStart may allow you more flexibility, if you do JumpStarts you
should check the docs to see if there is an easier way.
-- richard
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