[BBLISA] Moving from RAID 0 to LVM RAID?

[Edward Ned Harvey]

In nearly all situations, I'll recommend hardware raid controller, with
hotswappable hard drives, and at least raid 5 configuration.  So you get the
performance & size benefit of a bunch of disks, with at least some
redundancy to prevent data loss during hardware failure.



> -----Original Message-----
> From: bblisa-bounces at bblisa.org [mailto:bblisa-bounces at bblisa.org] On
> Behalf Of Scott R. Ehrlich
> Sent: Thursday, March 06, 2008 6:58 PM
> To: bblisa at bblisa.org
> Subject: [BBLISA] Moving from RAID 0 to LVM RAID?
> 
> So I've learned a valuable RAID 0 lesson, and it fortunately was not a
> major
> catastrophy.  I got lucky, and had a workable-enough backup on tape to
> make the
> user who needed some data happy.
> 
> Now, from the OS side, LVM is an option.   Say the RAID controller only
> allows
> hardware striping or mirroring for logical volumes, but I want to use
> more than
> two disks, and I don't want the RAID 0 problem again.
> 
> When I get a replacement disk and build the system from the ground up
> again, I
> could, conceivably, use hardware RAID 1 for the OS on two disks, and
> CentOS 5
> 64-bit's LVM for software RAID 5 (or maybe 1+0 if available) on the
> remaining
> for 4 disks, maybe 3 disks as active and the 4th as a hot spare?
> 
> I've never had much faith in software raid, since it is not hardware-
> based, and
> there would be a performance hit, but in this case, it could be an
> option.
> 
> Insights from the OS-created RAID experience welcome.
> 
> Thanks again.
> 
> Scott
> 
> _______________________________________________
> bblisa mailing list
> bblisa at bblisa.org
> http://www.bblisa.org/mailman/listinfo/bblisa