RE: Raid 5 Storage Slow Speed?

["Paul Gale" <groups2@xxxxxxxxxxxxxxxx>]

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?
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>