Messages in this thread |  | | Date | Fri, 3 May 2002 19:10:52 +0200 (CEST) | From | Roy Sigurd Karlsbakk <> | Subject | Re: IDE hotplug support? |
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On Thu, 2 May 2002, Jakob Østergaard wrote:
> On Thu, May 02, 2002 at 09:26:38PM +0100, Alan Cox wrote: > > > >=20 > > > > 8 x 130MBy/s >>>> PCI bus throughput... I would rather recommend > > > > a classical RAID controller card for this kind of > > > > setup. > > > > > > Because RAID controllers do not use the PCI bus ??? ;) > > > > The raid card transfers the data once, software raid once per device for > > Raid 1/5 - thats a killer. > > For RAID-1 it's a killer (for writes), I agree. > > But I really doubt it would be so horrible for RAID-5 - after all, it's only > one extra block (the parity block) for each N-1 blocks written (for an N disk > RAID-5). The penalty should be less, the more disks you have in the array. > > But seriously, has anyone out there ever seen a hardware RAID controller with > a *sustained* RAID-5 thoughput of more than 60 MB/sec ? Not that I think it > is impossible, but I've never heard about it. Enlighten me, please, and not > with marketing numbers...
I was doing some testing on a Compaq ProLiant 380 (perhaps G2 - don't remember) that was doing some 70-80MB/s on a RAID-5. That was, however, on 12 drives, 6 on each a controller. I managed to do a little more with JBOD and Linux Software RAID-5. That said, this was 18GB drives, which aren't the fastest drives on earth...
roy
-- Roy Sigurd Karlsbakk, Datavaktmester
Computers are like air conditioners. They stop working when you open Windows.
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