Le Tue, 22 Jan 2013 13:50:59 +0100
Samuel Kvasnica <samuel.kvasnica@xxxxxxxxx> écrivait:
> Actually, funny way, noalign is always better that sw/su alignment for
> any hardware-RAID I tried so far.
It may be because of lvm in case you're using it.
> But I do not think that mkfs or mount is that much relevant here as
> the local filesystem performance is pretty Ok (actually same as raw
> dd).
>
> The bottleneck issue comes only when exported by NFS over RDMA. And it
> seems more like a "pumping effect"
> that bottleneck.
>
NFS tends to make small IOs and can be tricky, in your case it reminds
me of a random access bottleneck, for instance log access. That's why
I'm wondering what iostat output looks like... Periodical log flushing
could be the culprit.
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Emmanuel Florac | Direction technique
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