Mailinglist Archive: opensuse (1695 mails)

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Re: [opensuse] 10.2 no RAID to 11.0 RAID 1
  • From: Rui Santos <rsantos@xxxxxxxxxxxxx>
  • Date: Mon, 22 Sep 2008 10:52:41 +0100
  • Message-id: <48D76AE9.7020202@xxxxxxxxxxxxx>

Felix Miata wrote:
On 2008/09/20 15:37 (GMT-0400) Per Jessen composed:

Hylton Conacher (ZR1HPC) wrote:

I see 11.0 has an option under the partitioner in YAST for RAID and I
am wondering if thee 11.0 install will allow me to create the RAID
array and set it up if it detects two drives of the same size and with
identical partitions?

Yes it will.

If you have a RAID1 BIOS built into the motherboard, are there any reasons
not to use it, as opposed to just using pure software RAID1?

Well, there are a few advantages, IMO, to prefer Linux Software Raid
over a pseudo-hardware guide:

1) There is the portability issue. I work with a few real-hardware RAID
controllers and I can tell from experience: Having to rely on the
Hardware Manufactures can cost you money. Just an example: if you have
say, an HP RAID card, and your RAID card "dies", you sometimes have to
wait a lot of time to get a compatible replacement. Of course this is
not always the case but, it happens a few times, especially on old
hardware. So, in what portability is concerned, I would prefer the Linux
Raid option.

2) Speed. Your pseudo-raid mobo card, does not do any math for you ( if
required ), but will require the processor to do it all. This is just on
RAID 4/5/6 setup. If you use RAID0, all information is striped onto you
HD's. I don't know if there is any performance improvements with either
of the solutions but, probably there isn't. With a RAID 1, all
information is mirrored to another HD. In this options I would prefer to
use the Linux Raid and rely on Linux to take care of all the
asynchronous writes. In what reading is concerned, Software RAID has
proven effective, as can reed from both HD's with great overall results.

3) Interoperability. With most Intel's chipsets you can hotplug your
HD's. Just use the mdadm tool to remove the HD from the array, remove
the HD, add a new one and rebuild your array. You can do this while your
machine is in production mode. I believe you are unable to do that with
a mobo pseudo-raid ?

4) Routine: If you have a lot a machines to set-up, you can have a
monitoring system witch is common to all the machines. You can save time
and money by just having one monitoring system.

Well, here is my 1 cent...

Rui Santos

Veni, vidi, Linux!

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