Hello.
To start, I installed RedHat 6.1 with root on RAID1. /boot is non-RAID.
It's using RedHat's 2.2.12-20 kernel which seems to have extra RAID stuff in it.
RAID1 is actually built as a module so it loads an initrd that has only
raid1.o, sh, and insmod in it.
I tried to upgrade to 2.2.16 by building the proper RAID support but to no
avail. Basically, it does not seem to autodetect the RAID devices. So, I read
md.txt and it says I need to pass md=x,x,x,x,x but it doesn't work for RAID1.
Well, I tried it anyway and it gets close but complains that the devices are
not linear or striped. Well, duh.
I'm left wondering why redhat's hacks to 2.2.12 have seemingly not made it into
the kernel after all this time. Am I missing some obvious or obfuscated step?
Are there any plans for RAID1 boot/autodetect support?
I don't see us moving our production systems to 2.4 before the end of the year,
so I don't care about 2.4's support. If there are no other plans to do this
integration into 2.2 then I wouldn't mind spending a day or two patching in
redhat's changes.
Ideas?
For shits and giggles, here is what I have experienced so far:
RedHat 2.2.12 booting:
md driver 0.90.0 MAX_MD_DEVS=256, MAX_REAL=12
md.c: sizeof(mdp_super_t) = 4096
partition check:
hda: hda1 hda2 hda4 < hda5 hda6 hda7 hda8 hda9 hda10 >
hdc: hdc1 hdc2 hdc4 < hdc5 hdc6 hdc7 hdc8 hdc9 hdc10 >
autodetecting RAID arrays
(read) hda5's sb offset: 524544 [events: 0000001f]
(read) hda6's sb offset: 2097536 [events: 0000001f]
(read) hda7's sb offset: 2097536 [events: 0000001f]
(read) hda8's sb offset: 524544 [events: 0000001f]
.
.
.
(read) hdc10's sb offset: 7307392 [events: 00000008]
autorun ...
considering hdc10 ...
(and so on... although I don't understand why the version number is 0.90.0)
2.2.16 booting:
md driver 0.36.6 MAX-MD_DEV=4, MAX_REAL=8
raid1 personality registered
partition check:
hda: hda1 hda2 hda4 < hda5 hda6 hda7 hda8 hda9 hda10 >
hdc: hdc1 hdc2 hdc4 < hdc5 hdc6 hdc7 hdc8 hdc9 hdc10 >
Oops! md0 not running, giving up!
hdc: hdc1 hdc2 hdc4 < hdc5 hdc6 hdc7 hdc8 hdc9 hdc10 >
Oops! md0 not running, giving up!
Bad md_map in ll_rw_block
EXT2-fs: unable to read superblock
Oops! md0 not running, giving up!
Bad md_map in ll_rw_block
isofs_read_super: bread failed, dev=09:00, iso_blknum=16, block=32
kernel panic: VFS: Unable to mount root fs on 09:00
--
Robert Dale
Digital Mission
