We noticed some performance issues on one of our Netapp Filers
and during my investigation I noticed a few things that happen
under the covers and I wanted to share them with you.
Netapp SnapMirror is an asynchronous method of mirroring files
from one location to another. At my company we use it to
replicate property images from one datacentre to another. I've
always wondered what happens to the replica as SnapMirror is a
block copy though obviously the destination may be different
therefore it needs to do something 'smart' to correct the
differences between the two filers.
The 'smart'ness is what is causing performance problems - so lets
go through them.
Here is some of the output of a 'statit' on the SnapMirror
replica. The filer is idle - its not doing any traffic and its
not snapmirroring.
nas02*> statit -e
Hostname: nas02 ID: xxxx Memory: 16376 MB
NetApp …
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Apr
05
2010
Showing entries 1 to 1