On Fri, 5 Feb 1999, D. Lance Robinson wrote:
> Maybe you could rig a switch in a drive power cable to kill the 12volt
> line. Or you could make a power cable extention with a switch in it.
> Then you could remove it once done testing.
>
> Killing the 12volt line will effectively break the drive. It would be
> interesting to see how various drives handle their error reporting.
I just recently (last Sun) set up a combo RAID 1 and RAID 5 setup and did
some crash testing with only a few test files from /usr/local on the
arrays. I just yanked the power cable from the drive. The end result was
pretty hairy but I did manage to recover all my data after replacing the
unplugged drive with another of exact same geometry. Some of my files
ended up in lost+found. I think part of the problem was that I have
mix/matched partitions. Does anyone else have some recommended testing
procedure? Below are my raidtab entries to illustrate my setup.
In hindsight I would probably not mix raid 1 & 5 on the same drives. The
reason I did this was to utilize max space with my current partitioning
scheme without using a root raid setup.
-Gary
# /etc/raidtab
raiddev /dev/md0
raid-level 5
nr-raid-disks 3
nr-spare-disks 0
parity-algorithm left-symmetric
chunk-size 512
device /dev/sda3
raid-disk 0
device /dev/sdb2
raid-disk 1
device /dev/sdc2
raid-disk 2
raiddev /dev/md1
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
device /dev/sdb1
raid-disk 0
device /dev/sdc1
raid-disk 1
# fdisk output for /dev/sda
Disk /dev/sda: 255 heads, 63 sectors, 554 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sda1 1 29 232911 83 Linux native
/dev/sda2 30 42 104422+ 82 Linux swap
/dev/sda3 43 554 4112640 83 Linux native
# fdisk output for /dev/sdb
Disk /dev/sdb: 255 heads, 63 sectors, 554 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 42 337333+ 83 Linux native
/dev/sdb2 43 554 4112640 83 Linux native
# fdisk output for /dev/sdc
Disk /dev/sdc: 255 heads, 63 sectors, 554 cylinders
Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 42 337333+ 83 Linux native
/dev/sdc2 43 554 4112640 83 Linux native
---
hack together /vt./
To throw something together so it will work. Unlike `kluge together' or
`cruft together,' this does not necessarily have negative connotations.
