ZFS committed to the FreeBSD base.
alex.wilkinson at dsto.defence.gov.au
Thu Apr 12 02:57:59 UTC 2007
0n Thu, Apr 12, 2007 at 12:51:25AM +0200, Bernd Walter wrote:
>On Wed, Apr 11, 2007 at 05:49:11PM -0400, David Schultz wrote:
>> On Sat, Apr 07, 2007, Dag-Erling Smrgrav wrote:
>> > Bernd Walter <ticso at cicely12.cicely.de> writes:
>> > > On Sat, Apr 07, 2007 at 09:43:59PM +0200, Dag-Erling Smørgrav wrote:
>> > > > ZFS is now also available on pc98 and amd64.
>> > > Great to read - is it just atomic.S missing for the remaining
>> > > architectures?
>> > Yes. Ideally, ZFS would use FreeBSD's atomic operations instead of
>> > its own. I believe that the reason it doesn't is (at least in part)
>> > that we don't have 64-bit atomic operations for i386. I have
>> > unfinished patches for cleaning up the atomic operations on all
>> > platforms; I'll dust them off and see what I can do.
>I already did a good cleanup of arm atomic functions based on your
>work a while ago.
>> As I recall, Solaris 10 targets PPro and later processors, whereas
>> FreeBSD supports everything back to a 486DX. Hence we can't
>> assume that cmpxchg8b is available. The last time I remember this
>> coming up, people argued that we had to do things slow way in the
>> default kernel for compatibility.
>486 support is definitively needed, but it is very unlikely that many
>real existing 486 system has enough RAM for ZFS.
>AFAIK a ELAN520 can have up to 256MB, but I doubt that one would
>spend so much RAM for such a system without better use for it.
>Not shure about 586, this is more likely.
>But I'm not very familar with x86 assembly, so I don't even know which
>CPUs have cmpxchg8b.
>If ZFS wouldn't be so greedy I might have used it on flash media for
>x86 and ARM systems, but those boards usually don't have enough RAM.
>> Any ideas how ZFS and GEOM are going to work out, given that ZFS
>> is designed to be the filesystem + volume manager in one?
>Although you want to use ZFS RAID functionality GEOM has still many
>goodies avalable, such as md, ggate, partition-parsing, encyption, etc.
>There are other cool points, which I've found possible lately.
partition-parsing ? got any info on that ? I have never heard of it.
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