high disk latency after moving iscsi to 10 GIG

[marshallmathers]

Hello i moved iscsi over to 10 GIG and am seeing a high number of high latency alerts ?

has this happened to anyone else before? we are running latest version of 5.5 .

Using intel x520 10 GIG CNA and CISCO N3k Switches. San is IBM v3700 .

KAVG and DAVG are hitting 200+ when looking at esxtop in hba mode.

[TheBobkin]

Hello,

DAVG of 200+ is not a good sign.

Does your SAN require any specific Multipathing plug-ins?

Are the drivers and firmware on the new links latest as per HCL?

Attach a vmkernel.log and a vobd.log from a host if you want and I can take a look.

Bob

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[schepp]

Hey, don't know if the IBM storage is affected, but high latency is often observed due to the feature "delayed ack".

You can read about it here:

ESX/ESXi hosts might experience read or write performance issues with certain storage arrays (100259...