Re: How do I increase NBUF safely?

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02-15-2008, 10:00 AM

Mike Brown

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Re: How do I increase NBUF safely?

google account wrote:
>
> Hello...
>
> My OpenServer 5.0.6 system seems to be suferring random go slows, and
> I am getting data out of sar suggests strongly that it is a disk
> system bottleneck and I should increase my NBUF to cope better with
> it... My big issue is that I really have absolutley no idea how to
> increase the NBUF figure, nor do I know how much to increase it by so
> as not to run myself low of memory in the system
>
> Can someone let me know...? Or point me to instructions?
>
> Just incase it make a difference, the system itself is an Intel Mobo
> with dual P3 Xeon processors and 1Gig of physical memory. I beleive
> it has been configured to have 3gig swap. The disk system is a SCSI
> RAID5 + hotspare thing, with 4 10000rpm 36g scsi drives...
>
> Thanks
>
> googleboy.

On a different angle, if your raid controller support RAID 1+0, then
reconfigure your hard drives. You will have to unload/reload with a
supertar.

I have seen RAID 5 causing a bottleneck, normally with a database and
numerous small writes. The RAID 1+0 has better performance in the same
test. With a three drive RAID 5 and one spare you can sustain a single
hard drive failure without loss of data ( performance will be hurt even
more during the rebuild ) but a second failure will cause a total volume
loss. With RAID 1+0 you can have a single drive failure with no loss
of data ( performance degredation will occur when the failed drive is
replaced, but its less noticable then with RAID 5 ), and it is possible
that a second hard drive can fail without the volume going down. A third
failure before any drive replacement will always kill it. So RAID 1+0
is no less secure than RAID 5, has better performance and you already
own the four drives.

Mike

--
Michael Brown

The Kingsway Group

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Re: How do I increase NBUF safely?