[Linux-cluster] Finding the bottleneck between SAN and GFS2

Daniel Dehennin daniel.dehennin at baby-gnu.org
Wed Jul 1 09:02:52 UTC 2015

Steven Whitehouse <swhiteho at redhat.com> writes:

> Why are you using the ping_pong test? Does qemu use fcntl locks? Are
> you trying to share any of those images across nodes? (i.e. mounted on
> more than one node at once?)

No, but I didn't know what and where to look, I test it if it could be

> What is the raw speed of the block device? I'd also suggest checking
> the files that are created to see if they are being fragmented (the
> filefrag tool will tell you) in case that is the problem?

Erf, I didn't check before before using it as LVM PV.

Now I can only test through GFS2-cLVM-multipath.

I'll see if I can have another LUN to check the raw speed of the block


Daniel Dehennin
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