Hi Jeff,
At 21:14 16.01.00 -0700, Jeff V. Merkey wrote:
>Is there a way with the RAID stuff to concatonate together
>several partitions and make them look like one logical
>partition? We can do this under NT for converting
>multi-segment NetWare volumes to NTFS, and want to do the
>same for EXT2 (we will give this tools away since
>it is on Linux).
Yes, you can: it's called linear raid mode; both the raid stuff currently
in the kernel (raid 0.4?) and the newer 0.90 raid code support this mode.
For the raid code in the kernel use
mdadd /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1
mdrun -pl /dev/md0
where /dev/sda1 /dev/sdb1 /dev/sdc1 are the partitions you want to
concatenate into a logical device.
For the new raid stuff you'd use a /etc/raidtab file to describe the device:
raiddev /dev/md0
raid-level linear
nr-raid-disks 3
nr-spare-disks 0
persistent-superblock 0
chunk-size 4
device /dev/sda1
raid-disk 0
device /dev/sdb1
raid-disk 1
device /dev/sdc1
raid-disk 2
and start the raidarray using
raid0run /dev/md0
Both these setups work without using any raid superblocks; advantage:
should work with pre-existing data. disadvantage: neat features like
automatic startup of raid devices by the kernel and finding the partition
regardless of SCSI ID aren't available. (the new raidcode works best if it
can place a 4k datastructure, the raid superblock, at the end of each
partition being part of a raid device).
Bye, Martin
"you have moved your mouse, please reboot to make this change take effect"
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