Re: hard- or software-raid?
There is perhaps one extra thing hardware RAID will give you. When it comes
to hardware failures a Hardware RAID card will almost always detect a
failed (or failing) drive before any software based system would. In fact
I've seen a RAID card detect a failed drive before the HDD manufacturers
own Disk Diagnostic software, and they were happy to replace it based on my
RAID cards diagnosis.
At 10:26 24/01/2003 +0100, Tinus Nijmeijers wrote:
My question kind'a stands: If the only thing I ask of it is for the data
to be safe (no speed or "no downtime!" issues) is there any reason to
use hardware over software raid?
I do not care if I have to take the server down for an hour (or 2, or 3)
to replace a disk, be it a raid disk or boot disk. I have plenty of
time, I could even run down to the store, get a new bootdisk, install
debian and be up and running in 2 hours. no problem.
ONLY thing that is important is that the data needs to be safe. if 2 of
the raid-disks fail I need the data to be safe.
(it is, of course, a budget thing. In case of fire I have tapes to get
the data back, there's downtime involved there. So I do care about
downtime. Just that with disks being as cheap as they are I was thinking
that a software raid is soooo cheap to build that maybe that's worth the
extra cash for the 3 extra disks that I need to buy.
scenario 1: boot of scsi, data is on a 200G IDE, tape backup
scenario 2: boot of scsi, data on 4x80G IDE (software-raid5), tape
backup = + EURO 100
scenario 3: boot of scsi, data on 4x80G IDE (hardware-raid5), tape
backup = + EURO 500
scenario 4: boot of scsi, data on 4x80G SCSI (hardware-raid5), tape
backup = + EURO 2200
so for close to nothing (E 100) extra I get software raid.
Is hardware raid "safer"?
(I do not think it is, I'm just waiting for someone to tell me I'm being