[Gluster-users] Ext4 safe for production use with gluster?

[phil cryer]

On Wed, Jul 7, 2010 at 2:45 AM, Daniel Maher <dma+gluster at witbe.net> wrote:
> On 07/07/2010 08:37 AM, Emmanuel Noobadmin wrote:
>
>> Initially, the reading suggested that ext4 would provide a significant
>> performance boost. Quite possibly since it delays write longer,
>> latencies of the network storage is hidden even better especially for
>> temporary files.
>>
>> After subsequent reading, it seems that the cost of the massive delay
>> allocation that could blow up really bad in the event the system
>> crash.
>
>> Assuming I'm using the most likely disk writing applications I'm using
>> is KVM, exim, dovecot, mysql and postgresql, would ext4 be safe for
>> production use or should I stick to ext3?
>
> We set up a small test case in our environment to test Gluster / ext4 in a
> simple 4-node client-replication setup.  After running it through the
> regular Bonnie / IOZone / FFSB tests, we determined that it _worked_, but
> that compared to ext3, we saw some strange timing results overall (wierd lag
> spikes, etc).  Unfortunately the project was scrapped early on (for external
> reasons), and no further investigation was done.  YMMV.

I'm running ext4 on my gluster cluster, can you share some of the
data, or methods/commands you ran? I'd be happy to spec out what ext4
looks like for me (we're just hosting files for web access, so we're
expecting it to be able to handle it), and post the results online to
share.

P

>
> If you do go ahead and put together a test suite, i'm sure i'm not the only
> one that would be interested in seeing the results. :)
>
> --
> Daniel Maher <dma+gluster AT witbe DOT net>
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