Wol, et al -- ...and then Wol said... % On 24/11/2022 21:10, David T-G wrote: % > How is linear different from RAID0? I took a quick look but don't quite % > know what I'm reading. If that's better then, hey, I'd try it (or at % > least learn more). % % Linear tacks one drive on to the end of another. Raid-0 stripes across all % drives. Both effectively combine a bunch of drives into one big drive. Ahhhhh... I gotcha. Thanks. % ... % % That's why there's raid-10. Note that outside of Linux (and often inside) % when people say "raid-10" they actually mean "raid 1+0". That's two striped % raid-0's, mirrored. That's basically what I have on the web server: jpo:~ # mdadm -D /dev/md41 | egrep '/dev|Level' /dev/md41: Raid Level : raid1 0 8 17 0 active sync /dev/sdb1 1 8 34 1 active sync /dev/sdc2 jpo:~ # mdadm -D /dev/md42 | egrep '/dev|Level' /dev/md42: Raid Level : raid1 0 8 18 0 active sync /dev/sdb2 1 8 33 1 active sync /dev/sdc1 jpo:~ # mdadm -D /dev/md40 | egrep '/dev|Level' /dev/md40: Raid Level : raid0 0 9 41 0 active sync /dev/md/md41 1 9 42 1 active sync /dev/md/md42 jpo:~ # jpo:~ # jpo:~ # parted /dev/sdb p Model: ATA ST4000VN008-2DR1 (scsi) Disk /dev/sdb: 4001GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags 1 1049kB 2000GB 2000GB Raid1-1 2 2000GB 4001GB 2000GB Raid1-2 4 4001GB 4001GB 860kB ext2 Seag4000-ZDHB2X37-ext2 jpo:~ # parted /dev/sdc p Model: ATA ST4000VN008-2DR1 (scsi) Disk /dev/sdc: 4001GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Disk Flags: Number Start End Size File system Name Flags 1 1049kB 2000GB 2000GB Raid1-2 2 2000GB 4001GB 2000GB Raid1-1 4 4001GB 4001GB 860kB Seag4000-ZDHBKZTG-ext2 % ... % % Either version (10, or 1+0), gives you get the speed of striping, and the % safety of a mirror. 10, however, can use an odd number of disks, and disks % of random sizes. That's still magic to me :-) Mirroring (but not doubling up the redundancy) on an odd number of disks?!? % % Cheers, % Wol HAND :-D -- David T-G See http://justpickone.org/davidtg/email/ See http://justpickone.org/davidtg/tofu.txt
