RE: Re: Raid 5 Storage Slow Speed?

["Paul Gale" <groups2@xxxxxxxxxxxxxxxx>]

Not sure about stripe size AIUI - smaller is better for small files
and bigger for large - but if storing lots of small files with large
stripe, you lose space i.e. it's inefficient.

Gigabit network may help - I have this on every PC/Server with large packet
support too - the network isn't the bottleneck, now it's the drive/array
performance.

Paul.

> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf
> Of aashram2000
> Sent: 17 February 2007 10:21
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Re: Raid 5 Storage Slow Speed?
>
> I have enabled Cache and get the performance increase.
> I am going to try put a gigabit network card on the machine which I
> have been told makes a difference. Anyone have any experience in that?
> I moving around files that sometimes 1 to 4gb which can be a pain but
> of course I like the redunducy aspect of raid5.
>
> I use Write Thru, cached IO and read head. My strip size is 64k.
>
> Does look like the optimal settings I should have?
>
>
>
> --- In ukha_d@xxxxxxx, "Paul Gale" <groups2@...>
wrote:
> >
> > Also, what options does the raid card give you?
> >
> > I have a 3Ware SATAII PCIe RAID card with a 1.5TB RAID5 array -
> until yesterday I didn't realise that I had write caching disabled on
> it - enabling this (although less secure in the event of power
> failure) increased my performance by 10 times!!!
> >
> > Might be a good idea to run a disk benchmark prog on the machine
> (whilst not transferring) to see what you're getting. IIRC I'm now
> getting 70-80 MB/sec write sequential which is OKish.
> >
> > Paul.
> >
> >
> >
> > > -----Original Message-----
> > > From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On
> Behalf
> > > Of Phil Harris
> > > Sent: 11 February 2007 19:04
> > > To: ukha_d@xxxxxxx
> > > Subject: RE: [ukha_d] Raid 5 Storage Slow Speed?
> > >
> > > Did you let it build the array fully before you started
copying or
> is
> > > it
> > > building whilst copying?
> > >
> > > If the array has already spent time initialising before you
started
> > > copying
> > > then that seems a bit on the slow side IMO (but then again
perhaps
> the
> > > megaraid does its parity calculations in software like the
> highpoint
> > > Rocket
> > > RAID cards did and they were bloody slow too).
> > >
> > > Phil
> > >
> > > > -----Original Message-----
> > > > From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On
> > > Behalf
> > > > Of amar
> > > > Sent: 11 February 2007 18:42
> > > > To: ukha
> > > > Subject: [ukha_d] Raid 5 Storage Slow Speed?
> > > >
> > > > I have a question about raid 5 storage for large video
and music
> > > files
> > > > On my media server.
> > > >
> > > > I have used the megaraid 6port sata card with a linux
distro and
> I am
> > > > transfer data to the new raid 5 configuration but I
find files
> are
> > > > transferring slowly. I was told that would be the case
but I
> never
> > > knew
> > > > it
> > > > would be this slow. Currently its have transferred
277gb and its
> been
> > > > working for nearly 24 hours. Is that normal? Are other
people
> using
> > > > raid5?
> > > > Its transferring data from an internal ide drive to
raid5 config
> -
> > > not
> > > > a
> > > > network transfer.
> > > >
> > > > Any pointers/comments?
> > > >
> > > >
> > > >
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