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тАО08-22-2017 02:00 AM
тАО08-22-2017 02:00 AM
OS 3.8.1.0
Microsoft Hyper-V 2012r2 cluster
iSCSI connections
Periodic during Veeam backup, Veeam ONE reports too high read or write latency on different CSV volumes. A exampel is:
Cluster shared volume 2012 write latency |
20-08-2017 23:29:05 |
"Disk/CSV2012: Write Latency" (272.0 Milliseconds) is above a defined threshold (80.0 Milliseconds) |
But looking at infosight labs, i see the read/write latency on this specific volume during this time never has been above 3ms. How come Windows reports different latencies vs. the storage actual latency?
Robert
Solved! Go to Solution.
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тАО08-28-2017 08:09 AM
тАО08-28-2017 08:09 AM
SolutionHi Robert,
You can always call support for this but if the latency is very low on the array side and very high on the application, that usually signifies an issue either on the network or the host itself. For example, you may not have enough iSCSI sessions set up.
I can take a look if you give me your serial number, dimitris@nimblestorage.com
But first think about bumping the minimum iSCSI session number to 4. You've installed NCM on this host?
On the Windows machine, run тАЬregeditтАЭ from the run window to bring up the Registry Editor. Navigate to HKEY_LOCAL_MACHINE > SOFTWARE > Nimble Storage > Connections > and find the MinConnectionsPerTarget entry. Make that a 4.
Thx
D
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тАО08-29-2017 07:18 AM
тАО08-29-2017 07:18 AM
Re: Write latency numbers from hypervisor vs. storage
Thanks. NCM is installed, and i┬┤ll start with raising the iSCSI connections to 4 and monitor the setup.
If this does not help, i┬┤ll open a case.
Again thanks.