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Old 08-09-2006, 04:48 PM   #1
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Replacing the raid disks.

I have to replace both disk on compaq BL20 blade (application need more disk space). Currently they are hardware mirrored 2X72GB drives. I want to replace them with 2X146GB.

I have got some idea but i would like to confirm with some of folks here. Here are steps i am thinking :

1. Pull the second mirror drive.

2. insert the new 146GB drive & let it sync with primary disk of 72 gb.probably it would leave rest 72 gb as unused space.i should be able to partition that space using fdisk.

3. once it sync (how to check it? ) try to boot from new 146gb disk. If it goes well insert the second 146GB disk & let complete sync.

Raid controller is compaq cciss. Enclosed output of fdisk :
[root@fcold1 dev]# fdisk -l /dev/cciss/c0d0

Disk /dev/cciss/c0d0: 72.8 GB, 72826629120 bytes
255 heads, 63 sectors/track, 8854 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/cciss/c0d0p1 * 1 10 80293+ 83 Linux
/dev/cciss/c0d0p2 11 271 2096482+ 83 Linux
/dev/cciss/c0d0p3 272 525 2040255 82 Linux swap
/dev/cciss/c0d0p4 526 8854 66902692+ 5 Extended
/dev/cciss/c0d0p5 526 917 3148708+ 83 Linux
/dev/cciss/c0d0p6 918 1178 2096451 83 Linux
/dev/cciss/c0d0p7 1179 3367 17583111 83 Linux
/dev/cciss/c0d0p8 3368 5556 17583111 83 Linux
/dev/cciss/c0d0p9 5557 7016 11727418+ 83 Linux
/dev/cciss/c0d0p10 7017 8476 11727418+ 83 Linux
/dev/cciss/c0d0p11 8477 8854 3036253+ 83 Linux

Old 08-12-2006, 10:44 AM   #2
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I don't think it would work the way you want. You're talking about hardware rather than software RAID. If so it is the BIOS of the RAID controller that is presenting "disks" (actually LUNs) to the system. You'd have to modify the setup of the RAID controller to add more disks.

For Linux I've used only the Dell PERC Raid Controllers (I think they're OEMed from Adaptec). Although I haven't done what you want the setup I have done makes me think one could add a second RAID LUN in the BIOS to make it available to the system as a "DISK". What I don't know is what the impact of replacing with a different size disk would be. It MIGHT just rebuild the original RAID LUN using only the portion of the disk needed (73 GB) for it. On the other hand it MIGHT say "wrong size disk" and do nothing. If it did the former then I would try replacing the other disk and let it rebuild. I'd then use the RAID BIOS to make a second LUN. (Container I think they call it in PERC.)

The one thing I would DEFINITELY do before anything else is backup the entire drive and make sure I had install CDs/DVDs on hand it doesn't work. You may have to just replace both disks at the same time and use the RAID BIOS to create the LUNs you want.

Exploring your RAID BIOS setup screens before replacing anything may give you some idea how well this would work


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