On Fri, Nov 21, 2008 at 12:16:05PM -0800, Heady wrote:
> Folks,
> I've been struggling with a similar problem for a while now.  My write
> speeds are around 110M/s whereas, even following A. Eijkhoudt's advice
> I've only been able to get 34M/s reads.
> * The initiator is Open-iSCSI running on the Xen client.  The exported
> targets are then S/W RAID1 and the resulting md1 is then divided using
> client side LVM2 presenting the LVs to the client.
> So the software stack is quite layered.  However, this doesn't seem to
> be a problem for writes (110M/s) just reads (30-34M/s).

Are you using partitions on the client iSCSI devices? Are your partitions
aligned for example with 64k boundary? Have you tried without partitions?

I'd measure with the raw iSCSI device (/dev/sdX) first, and then start
adding additional layers (md-raid, lvm, etc).

-- Pasi

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