On Sun, Mar 22, 2009 at 1:08 AM, Arun Khan <[email protected]> wrote: > Has anyone done a 0+1 SW RAID?
I had similar setups a few years ago when Linux did not have native raid10 support. So I had to create two raid1 devices and then stripe them with a raid0 device on top. My setup worked well enough for me to put into production use, and I think they are still running. Instead of layering multiple raid levels, new Linux kernels offer native raid10 support. I have not used this, it would be good to research this further before making a decision. > I am thinking of configuring 2 disks (sda+sdc) in a RAID0 setup and then > mirror this RAID device on the other 2 disks (sdb+sdd). Do not do it this way. If a single disk fails, the rebuild will take too long. Better way to setup is like this: md0 = raid1 sda+sdc md1 = raid1 sdb+sdd md2 = raid0 md0+md1 mkfs on md2 In case of sda failure, only sda+sdc need to be re-synced. Doing it your way will mean that md0 and md1 need to be re-synced and will take double the time. Note that as long as you are not doing RAID parity computation, as in RAID5/6, SW raid has absolutely no CPU hit. SW RAID0/1 are all good in my book. - Raja _______________________________________________ To unsubscribe, email [email protected] with "unsubscribe <password> <address>" in the subject or body of the message. http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
