Re: Raid 0+1

[Lars Marowsky-Bree <lmb@suse.com>]

On 2012-11-30T15:27:56, Sebastian Riemer <sebastian.riemer@profitbricks.com> wrote:

> Yes, it is possible but it only makes sense if you want to mirror to
> another server as most people know that the alternative DRBD is too slow
> for serious storage requirements.
> 
> Create the RAID-0 first, then take your RAID-0 device and e.g. an iSCSI
> device from another storage server with the same setup and create a
> RAID-1 over them. Then, you've got your stacked MD layers.
> 
> With the flag write-mostly you can even tell the read balancing that the
> remote device is slower than the local one.

That is somewhat orthogonal to the original discussion, but in which
benchmarks is this approach faster than DRBD - aren't the bottlenecks
still the spindle and the network IO?



Regards,
    Lars

-- 
Architect Storage/HA
SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 21284 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde

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