You didn't give much detail about the hardware, but you mentioned a PE2950 which I assume is Dell Power Edge 2950. I worked with some of these last year and our standard storage configuration was 4 internal disks configured as a single RAID 5 volume using the embedded RAID controller. Actually what I had recommended was 6 smaller internal disks for the same price.
The RAID 5 provided an acceptable balance between capacity, protection, and performance. We did some minimal testing to see if reconfiguring the same hardware with mirroring (was it 2 RAID 1 volumes or 1 RAID 1+0 volume?) would provide a performance boost (at the expense of capacity), but we did not notice an meaningful difference in our application. Your mileage may vary. Rick On Thu, Mar 6, 2008 at 6:58 PM, Scott R. Ehrlich <[EMAIL PROTECTED]> wrote: > 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 > [email protected] > http://www.bblisa.org/mailman/listinfo/bblisa >
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