Urgent Problem i/o ;(

[Gr-R]

Is this iSCSI target? or NAS Volume?
Have you tried without the bond?

[javiercampos]

ISCSI target.
Also turn off the bond.

[Gr-R]

Open a support case, so we can see your system logs

[webguyz]

What model disk controller? Do you have Jumbo Frames enabled? Did you tweak the ISCSI target settings as described in various threads in this forum? Getting between 52 MB/s - 89 MB/s depending on traffic using your command line in a centos 5 vm using LSI 9260 disk controller and RAID 10 Sata Drives and Jumbo Frames,target settings tweaked and using MPIO (not bonded). Have about 32 vms active under Xenserver 6.0

[javiercampos]

Thanks for the answers, I contacted support and make the following changes:

maxRecvDataSegmentLen=262144
MaxBurstLength=16776192
Maxxmitdatasegment=262144
FirstBurstLength=65536
DataDigest=None
maxoutstandingr2t=8
InitialR2T=No
ImmediateData=Yes
headerDigest=None
Wthreads=8

and jumbo frames 9000 and my disk SEAGATE ST31000424SS 00069WK36GJR

[javiercampos]

Do you have any additional configuration xenserver?
What version do you have? payment or free?

[Al-S]

What is the build of your Xenserver? is it the latest? as your xen might have an issue with your NIC drivers, did you checked for that!

[webguyz]

Do you have any additional configuration xenserver?
What version do you have? payment or free?

payment or free is the same as far as base functinality of xenserver goes. Prefer MPIO to bonding because you can get close to 2 gig throughput, but in bonding your still only getting 1 gig max throughput to any one server.

[javiercampos]

switch are using some special?