Re: Software RAID

[Bill <ngc4013@xxxxxxx>]

fedora-list-request@xxxxxxxxxx wrote:

Message: 2
Date: Sat, 24 Jun 2006 11:42:54 +0200
From: Mogens Kjaer <mk@xxxxxx>
Subject: Re: Software RAID
To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
Message-ID: <449D091E.7050207@xxxxxx>
Content-Type: text/plain; charset=us-ascii; format=flowed

Tom Spec wrote:
...
  

Clearly it's not as good as hardware RAID, but still I think
it is MUCH  better than nothing.
    

The SCSI hardware RAID controllers I've seen in the past
(HP/Compaq SmartArray and an IBM serveraid) have all
had worse performance than using Linux software RAID.

Software RAID (RAID 5 in my case) was 2x faster writing and
3x faster reading than hardware RAID.

Mogens

  

I have been using software RAID5 and RAID0 for about 5 years formatted with reiserfs and the last couple of years it has been managed using mdadm. I currently have 8 JBOD RAID arrays totaling ~14TB running on Adaptec RAID controller cards. Only two problems I have seen are the speed of RAID5 is a little disappointing and a couple of the drive array chassis behave funny when booting. I think it's the time delay needing to be longer before starting the server to fix the booting issues. As for the RAID5 performance issue I am thinking of moving two boxes each over to RAID0 then set them up as a RAID1 between them. That may solve my need for speed.

Bill Cronk