[Xen-users] Raid1 performance

[blub@xxxxxxxx]

hello
i've been trying to achieve reasonable disk i/o performance on xen.
on debian 5.0.4 (xen 3.2.1, kernel 2.6.26) the pv/hvm performance is
alright with a raid1 inside the domU. unfortunately the qemu version
(0.9.0) does not cover my needs.

so i've been trying xen 3.4.2 & 4.0.0rc8 on gentoo (2.6.31)
on both versions, the disk i/o performance drops to zero when copying
large files. initially the performance is ok (~30mbyte/s) but drops to
zero after ~300mb, i've tried it with wget/ftp/scp
this happens with both PV & HVM domU's. i've tried multiple nic drivers

the performance seems alright if no raid1 is running on the domU
i cannot run the domU raid1's on the dom0 since there are multiple dom0s
connecting to multiple FC SAN's and the raid1's are done across the SAN's

(btw, the performance with raid1's on the SAN's is excellent on dom0)

anyone else has experienced this issue?


thanks in advance




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