Hello there
I'm using CentOS 5.1 (as well as RHEL 5.1). Since my more immediate problem is with CentOS, and not my production environment (RHEL) i figured i'd try here, rather than RedHat. Google doesn't seem to give me anything useful and Red Hat's documentation on the subject (
http://www.redhat.com/docs/manuals/e...ath/index.html) is not particularly useful either.
I've got two RAID provided disk groups /sda and /sdb which i've blacklisted in /etc/multipath.conf so that they don't show up. So remaining visible are /sdc and /sdd which are my HBAs. However i don't believe the problem is with multipathd.
I believe device mapper is what's at fault alas i can't find much about actually configuring IT itself.
when my system has started i get the following output from `fdisk -l`
Code:
root@fact /]# fdisk -l
Disk /dev/sda: 146.1 GB, 146163105792 bytes
255 heads, 63 sectors/track, 17769 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 16 128488+ 83 Linux
/dev/sda2 17 1060 8385930 83 Linux
/dev/sda3 1061 2104 8385930 83 Linux
/dev/sda4 2105 17769 125829112+ 5 Extended
/dev/sda5 2105 3148 8385898+ 83 Linux
/dev/sda6 3149 3670 4192933+ 83 Linux
/dev/sda7 3671 4192 4192933+ 83 Linux
/dev/sda8 4193 4714 4192933+ 83 Linux
/dev/sda9 4715 4968 2040223+ 82 Linux swap / Solaris
/dev/sda10 4969 17769 102824001 83 Linux
Disk /dev/sdb: 146.1 GB, 146163105792 bytes
255 heads, 63 sectors/track, 17769 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 17769 142729461 83 Linux
Disk /dev/sdc: 322.1 GB, 322122547200 bytes
255 heads, 63 sectors/track, 39162 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 39162 314568733+ 83 Linux
Disk /dev/sdd: 322.1 GB, 322122547200 bytes
255 heads, 63 sectors/track, 39162 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdd1 1 39162 314568733+ 83 Linux
Disk /dev/dm-0: 322.1 GB, 322122547200 bytes
255 heads, 63 sectors/track, 39162 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/dm-0p1 1 39162 314568733+ 83 Linux
Disk /dev/dm-1: 322.1 GB, 322118383104 bytes
255 heads, 63 sectors/track, 39161 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/dm-1 doesn't contain a valid partition table
/sda and /sdb, no issue, /sdc and /sdd with their single underlying partition, matching in size (and in fact layout) /dev/dm-0 the amalgamation of the two, with it's amalgamated /dev/dm-0p1 . and then there is /dev/dm-1 which is >just< smaller than sdc, sdd and dm-0 .
Until last week, i found this odd but accepted it, because although i could not interact with dm-0 OR dm-0p1 i could interact with dm-1 which worked swell. But now that i have a basically working system, i would like to tie up loose ends.
what is dm-1 and why don't i have a /dev/dm-0p1 ? Any documentation i find doesn't really go beyond setting up dm, and never goes into interacting with the device, beyond that you end up using it (thus adding to my confusion).
Does anyone have any familiarity with this, and is thus able to help me out?
Please?
cheers, chakkerz
