Messages in this thread | | | Date | Tue, 18 Jan 2000 15:36:00 +0100 | From | Martin Bene <> | Subject | Re: NWFS 2.0 Binaries Released |
| |
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" -------------------------------------------------- Martin Bene vox: +43-664-3251047 simon media fax: +43-316-813824-6 Andreas-Hofer-Platz 9 e-mail: mb@sime.com 8010 Graz, Austria -------------------------------------------------- finger mb@mail.sime.com for PGP public key
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |