Vmotion IO rate problem

[vm4you]

Hi,

Plateform is HP ML370 G5 with last firmware / ESX 3.5 with last patch. Host A is running LP10000 (2 gbit/s) with last firmware / Host B is running LPe11000 (4 gbit/s) with last firmware. SAN is Cisco MDS9222i / Storage HDS USP/VM.

We noticed a well know IO intensive VM running performing poorly on Host B running 2Gbit/s HBA (10000 KBps instead of 100000 KBps...). This VM was running before on Host A with normal performance (100000 KBps), we have just Vmotion it on Host B when we noticed the problem.

We did then following action :

• Vmotion VM back to Host A running 4Gbit/s HBA : same problem

• Vmotion VM to move back to Host B : ok, performance are here : 100000 KBps

We reproduce many time this problem, is it a SAN problem ?, a storage problem ?.

Is it supported to Vmotion a VM between host with one running a 2gbit/s card and the other a 4gbit/s card ?

Any idea about this problem ?

Thanks.

[mike_laspina]

Hello,

There are a lot of possible's.

Can you post the following.

output of /var/log/vmkwarning

output of esxcfg-info -n

output of esxcfg-mpath -l

also run esxtop -b > esxtop.csv for 30 seconds and post the csv file it creates.

[spex]

Maybe one of your uplinks of the storage array ist bad. Since the hds is active/active a change in pathing can occure if vm is vmotioned.

Just one of many possible guess's.

Regards

Spex