VMware VM server pings slower on NFS storage

I noticed that a server that had been on an iSCSI LUN-based datastore now has a slower ping time at times once it was moved to an NFS-based datastore.  Has anyone seen this, and, if so, is it any cause for concern?  Is there a way to fix it?  I'm moving a larger server to NFS and want to make sure we're not making things worse than it had been on iSCSI (which was very bad, as of late!)

Environment includes two ESX hosts connected to 8 TB usable storage via iSCSI (5 LUNs) and 2 NFS shares.  The entire storage backend is in one subnet and is protected from the rest of the network via a firewall.
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Danny McDanielClinical Systems AnalystCommented:
since you have identified storage as a change, have you looked at the latency statistics if you have ESX 4.1?

having a snapshot on a VM that is under heavy disk I/O will cause pings to fail, too, so remove any VM snapshots.

also, since both protocols are using a shared network switch...what model/type of network switch(es) are you using?
thomsoneAuthor Commented:
Latency seems low.  The storage uses dell power connect switches.  A vswitch exists for iscsi connections.  Do we need a vswitch for nfs?
Paul SolovyovskySenior IT AdvisorCommented:
What type if nas device are you using for nfs?  
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could be many causes for this.

how many NIC's do your ESX servers have?
are you using VLAN's?
how many ESX Standard Switches do you have?
thomsoneAuthor Commented:
We're using a Scale Computing SAN for this with SATA drives.

BTW, the response time seems to have normalized.
Paul SolovyovskySenior IT AdvisorCommented:
Typically ping times do not reflect performance since there are several layers involved (could be LAN issues and not NFS issue if on different VLANs).  Looks like the issue fixed itself but I would look at the switches, ensure STP, routing, and configuration is setup correctly

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