> Ricardo Kleemann <[EMAIL PROTECTED]> writes: > > That's wonderful! > > > > Now will Linux implement anything greater than RAID0? It does. Raid1 is in development. It does partial mirroring using about 1/3rd of the disk space for 'backup' data.
> > Would you say your performance is significantly increased with striping? I have an ncr53c815 card with two 312mb XT 1986 scsi-1 SLOW maxtor drives. They definately perform much better after being raid0'ed. If there would be a point at which the data read from a drive was faster than the cpu could crunch the raid0 'virtual' device, it would be slower than no raid at all. I personally don't see how any setup could be this 'disk fast' and 'cpu slow'. >From my experience it is significantly faster. It is literally (for me) doubling the number of read-heads that can be reading or writing data at a given time. > > How many drives can be striped? You can have 4 raid devices. /dev/md0 - /dev/md3. I am not aware of a limitation on the number of 'block' devices that can be grouped under each raid device. I would also be surprised if you were not able to increase the numbers if you needed to. Reminds me of ppp/slip in it's early stages. A default limit of 4. Then they raised it to 16, and finally to on-the-fly-creation of devices up to a default limitation of 256, with an easy #define to change to increase this limitation. I see no reason why the raid devices will not follow this pattern. > md just groups a number of physical disk partitions into one logical one, > /dev/md*. I'm being picky, but no, it groups block devices. I couldn't get it to work with a loopback device, so perhaps right now block device = hard drive. But it shouldn't have to. One happy raid0 user. -- Todd Fries .. [EMAIL PROTECTED]
