Re: [Moosefs-users] Best FileSystem for chunkers.

[Elliot F. <efi...@gm...>]

We tried using FreeBSD/ZFS with one disk per zpool just for simplicity
sake.  ZFS is unable to correct bit errors in this configuration, so
if you get a bit error, the pool goes offline.  MFS doesn't like that
at all. :)  We ended up using good old UFS2.

On Thu, May 17, 2012 at 1:44 PM, Steve Wilson <st...@pu...> wrote:
> On 05/17/2012 03:26 PM, Atom Powers wrote:
>> On 05/17/2012 11:56 AM, Steve Wilson wrote:
>>> I'd like to know if anyone has tried a file system with compression like
>>> ZFS on Linux.  Some have mentioned that it might yield a performance
>>> improvement.  I might give it a try on our next pair of chunk servers
>>> but it would be good to know if anyone else has gone this route before
>>> and what their experience has been.
>> I use ZFS on FreeBSD, which is one of the main reasons I use FreeBSD on
>> my chunk servers.
>>
>> Good:
>> * Compression, 1.16x in my environment
> I don't know if 1.16x would give me much improvement in performance.  I
> typically see about 1.4x on my ZFS backup servers which made me think
> that this reduction in disk I/O could result in improved overall
> performance for MooseFS.
>> * zraid
>> * probably improved performance (I haven't done a comparison on MooseFS
>> but saw better performance over UFS for "standard" file system use)
>> * Easy to carve up for other uses on the same server
>>
>> Bad:
>> * high RAM requirement
> Is the high RAM due to using raidz{2-3}?  I was thinking of making each
> disk a separate ZFS volume and then letting MooseFS combine the disks
> into an MFS volume (i.e., no raidz).  I realize that greater performance
> could be achieved by striping across disks in the chunk servers but I'm
> willing to trade off that performance gain for higher redundancy (in the
> case of using simple striping) and/or greater capacity (in the case of
> using raidz, raidz2, or raidz3).
>
>>
>> Ugly:
>> * FreeBSD is tricky to build with bootable ZFS
>> * Linux ZFS is FUSE.
>
> If someone is using Linux, I would definitely recommend the ZFS native
> on Linux port (http://zfsonlinux.org/) rather than the FUSE version of
> ZFS.  I've been using it for my backup servers for about six months now
> and with very good success.
>
> Steve
>
>
>
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