Home
| Calendar
| Mail Lists
| List Archives
| Desktop SIG
| Hardware Hacking SIG
Wiki | Flickr | PicasaWeb | Video | Maps & Directions | Installfests | Keysignings Linux Cafe | Meeting Notes | Blog | Linux Links | Bling | About BLU |
" 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?" >From what I understand about LVM's it doesn't buy you anything and will make your headache only so much worse. If you have a computer that allows 3 drives in it, chances are very high that it will have a raid 5 controller built in, if it doesn't you have several options. RAID 1 2 drives using 2 other drives as backup, Software raid 5 3 drives using one as a hotspare, software raid 4 drives (this benefit is that you don't loose AS much disk space as the other 2). LVM doesn't buy you anything, sure you can group together volumes but if a drive dies, then you loose all the LVM's associated with it, this is bad and in fact your LVM controller may really hate you, I haven't had experience with LVM's and a disk from that group dieing, but i'm almost sure it's not pleasant. If you are seriously concerned about disk I/O this much it's worth it for you to invest in a san, more computers or the like IHMO. ~Ben On Thu, Mar 6, 2008 at 6:56 PM, Scott R. Ehrlich <[hidden email]> 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 > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > > _______________________________________________ > Discuss mailing list > [hidden email] > http://lists.blu.org/mailman/listinfo/discuss >
BLU is a member of BostonUserGroups | |
We also thank MIT for the use of their facilities. |