On Fri, 3 Aug 2001 06:19, Brian May wrote: > Alvin> hi ya george > > Alvin> for raid1.... typically /dev/hda is copied to /dev/hdb > > Alvin> - dont know why you'd wanna mirror a partition... ( > Alvin> system will still be dead since the rest of the required ( > Alvin> partition is not available > > Easy, you create a separate software-RAID1 partition for every > partition on you harddisk, so in affect you mirror one harddisk on to > the other harddisk. > > It might be possible (?) to mirror /dev/hda to /dev/hdb, but then you > need to subdivide that space up into partitions.
Sure, it's quite possible to mirror /dev/hda to /dev/hdb, but then the auto-detect RAID stuff (which relies on having partition type 0xfd) won't work. But then it won't work with RAID in a module on an initrd either - and with the modern setup this is what you should be doing. > lvm could be used to do this (AFAIK), but all my attempts to use lvm > up to now have failed. Yes. Ideally you mirror the raw devices (if the sizes match) and then run LVM on that. For different size disks you have to mirror a whole disk to a partition on the larger disk, but such mirroring won't give best performance either... -- http://www.coker.com.au/bonnie++/ Bonnie++ hard drive benchmark http://www.coker.com.au/postal/ Postal SMTP/POP benchmark http://www.coker.com.au/projects.html Projects I am working on http://www.coker.com.au/~russell/ My home page
