[Beowulf] Forwarded from a long time reader having trouble posting
toon.knapen at gmail.com
Wed Dec 2 03:59:55 PST 2009
> I believe the older kernels handle the extra cores rather poorly, and don't
> even recognize the intel CPUs as NUMA enabled. You didn't mention hardware
> software RAID. I'd recommend RAID scrubbing, and if software that requires
> think) >= 2.6.21, although (I think) Redhat back ported it into their
> kernels in 5.4, or maybe 5.3. Definitely not in 5.1 though.
For performance reasons we added the 3ware card to handle the raid.
> I've not seen a particularly big difference on random workloads typical of
> databases. Are the databases bigger than ram? Does your 3ware have a
> battery? Allowing the raid controller to acknowledge writes before they
> the disk might be a big win (if your DB has lots of writes)? Can you
> afford a
> SSD to hold the berkeley DB?
The card has 512 MB of memory. I suppose it will cache the writes there. But
the bdb's can be up to 70 GB large so we'll never be able to pull them in
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