Re: [Xen-users] Xen SAN Questions

[Matthew Sacks <ntwrkd@xxxxxxxxx>]

Just to clarify, which GFS are you talking about?
Two exist.

On Wed, Jan 28, 2009 at 7:01 AM, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
> On Wed, Jan 28, 2009 at 9:09 PM, Tait Clarridge
> <Tait.Clarridge@xxxxxxxxxxxx> wrote:
>> Well I figured out one thing, that my numbers were totally off for EXT3 and 
>> XFS without DRBD haha.
>>
>> I will do some more testing, I can't believe I ruled out "dd" as a viable 
>> benchmark.
>>
>> *smacks forehead*
>>
>> Thanks for the help, I am testing with those DRBD config options now.
>
> I'd be interested to hear about your results.
>
> To tell the truth, I was tempted to try a similar setup. I decided
> against it though, because :
> - using local disks provide higher I/O throughput. Using
> network-attach disks, however, is mostly limited by the network
> interconnect speed. For example, 1 Gbps network link could only give
> max (theoretical) throughput of 125 MBps while local disks can easily
> give 235 MBps (tested with dd)
> - active-active DRBD setup can produce split-brain
>
> So in the end I settled for scheduled zfs-based backup. That is :
> - when using opensolaris dom0, I can use zvol-backed storage and do
> backups from dom0
> - when using Linux dom0, I use zfs-fuse on domU and perform backups there.
>
> Again, I'd be interested to hear about your results. If you can get
> something like 200 MBps then I'd probably try to implement a similar
> setup.
>
> Hint : You probably want to stay away from GFS as domU's backend
> storage. Just use LVM-backed storage (with cLVM, of course) for MUCH
> faster performance. To measure its performance, a simple way is using
> dd on the block device.
>
> Regards,
>
> Fajar
>
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