Re: Raid 5 Storage Slow Speed?

["aashram2000" <groups@xxxxxxxxxxx>]

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