Mailinglist Archive: opensuse (3441 mails)

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Re: [opensuse] happy "dmraid" at boot
  • From: "Greg Freemyer" <greg.freemyer@xxxxxxxxx>
  • Date: Mon, 19 Jan 2009 14:31:47 -0500
  • Message-id: <87f94c370901191131t4cd412e3vc469282de6197b33@xxxxxxxxxxxxxx>
On Mon, Jan 19, 2009 at 2:08 PM, David C. Rankin
<drankinatty@xxxxxxxxxxxxxxxxxx> wrote:
Yas say wrote:
You have RAID1 but I have RAID5 which I'm installing Linux on it.

<snip>

Also the only raid I used with Linux before was mdadm - it supported mirror
too. Actually if I just wanted use raid1 I wouldn't buy nothing since Linux
can set it up anyway. You had that system since 10.3 but this's the first
time I put Linux in this system.

So you have 3 disks?


Yep, but only 2 in my RAID1

[11:53 ecstasy:/home/backup/ecstasy/config] # cat /proc/partitions
major minor #blocks name

8 0 488386584 sda
8 1 1 sda1
8 5 72229 sda5
8 6 2104483 sda6
8 7 20972826 sda7
8 8 465234336 sda8
8 16 488386584 sdb
8 17 1 sdb1
8 21 72229 sdb5
8 22 2104483 sdb6
8 23 20972826 sdb7
8 24 465234336 sdb8
8 32 488386584 sdc
8 33 20972826 sdc1
8 34 467411175 sdc2
253 0 488386583 dm-0
253 1 488384001 dm-1
253 2 72229 dm-2
253 3 2104483 dm-3
253 4 20972826 dm-4
253 5 465234336 dm-5

Having never tried RAID5 before, I didn't know a recompile would be
necessary.
But, I do agree with your basic premise that dmraid works great and openSuSE
should fully get behind it and support it. They have been making improvements
on properly handling dmraid arrays on install and making grub behave properly
with them.

See: https://bugzilla.novell.com/show_bug.cgi?id=445602

Just a reminder that the basic Linux approach to software raid is to
use mdraid (software raid) if you can. If that cannot satisfy your
needs, then move to dmraid (fake raid).

Personally, I am seriously considering using mdraid in a project soon,
but I don't envision myself ever using dmraid. I guess you never know
so I won't rule it out.

Greg
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