RedHat Advanced Server 2.1AS Raidtools-1.00.2-1.2 Couldn't seem to find anything relevant in the linux-raid archive... Had an internal discussion regarding the choice of linear versus raid0. We'd like to standardize on a usage within our company. (If this makes a difference: We have a SAN which will present a host with a disk using SCSI over fibre. (That's the extent of my SAN-technical jargon/knowledge.). The virtual disk presented to the host is a 0+1 RAID volume on the other end which is supposed to be transparent to the user/host system.) Disks will not necessarily always be of the same size, but we do want to concatenate them, so I guess linear would be the way to go. Problem is I built a RAID0 array during testing, and was now trying to convert it to linear, by simply: *editing the /etc/raidtab file appropriately: raid-level 0-->raid-level linear *umount /raid_dir *raidstop /dev/md0 *mkraid -R /dev/md0 I would assume that this is the appropriate procedure, but I get a nasty kernel crash, of which I don't have anything able to capture it. (Tried different combinations of enable/disabling the persistent-superblock. I've not been able to reproduce it regularly, but was getting errors that "persistent-superblock was not supported by linear or RAID0" at various times during the boot process, but once I redid the md device with a mkraid, and built a new fs, it seemed to be OK. The logs complained about an invalid superblock on the device 0 everytime.) I'd also like to confirm that RAID0 can only be used for disks of aproximately the same size. If they aren't, does the extra space become unusable? Marco - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
