LinuxQuestions.org - /dev/hdc1 always disappears on reboot

Ok, so I have an ubuntu 7.04 system with a 5x250gb software Raid-5
array.

On boot, I get dropped to the recovery console, at which point /dev/
hdc1 is missing. /dev/hdc is present, and running fdisk -l /dev/hdc
shows the proper partition is present. Running partprobe doesnt pick
up the partition, and it isn't listed in /proc/partitions.

the way I have fixed this temporarily is as follows:

fdisk /dev/hdc
immediately hit w to rewrite the partition as it's currently setup.
mdadm /dev/md0 -a /dev/hdc1 <--|| Re-add the partition to the array
mdadm -R /dev/md0 <--|| Reactivate the array

The array rebuilds, I fsck the array, mount the drive, boot into
ubuntu.

The problem is, I have to go through this every single time I
reboot.

So, does anyone have any thoughts as to why this is happening?

kernel version is 2.6.20-16-generic smp
ubuntu 7.04, completely updated as of last week.
motherboard is a via P4-PB400.

Code:

--------------------------------------------------------

--  /etc/mdadm.conf:

--------------------------------------------------------



DEVICE partitions



# auto-create devices with Debian standard permissions

CREATE owner=root group=disk mode=0660 auto=yes



# automatically tag new arrays as belonging to the local system

HOMEHOST <system>



# instruct the monitoring daemon where to send mail alerts

MAILADDR root



# definitions of existing MD arrays

ARRAY /dev/md0 level=raid5 num-devices=5 UUID=4d06b8f6:35bfaa9f:

41b132e7:e26acd80

  spares=1



# This file was auto-generated on Fri, 01 Jun 2007 22:00:13 -0400

# by mkconf $Id: mkconf 261 2006-11-09 13:32:35Z madduck $

Code:

--------------------------------------------------------

--  Excerpts from /var/log/dmesg

--------------------------------------------------------



[    5.376000]    ide1: BM-DMA at 0xdc08-0xdc0f, BIOS settings:

hdc:DMA, hdd:DMA

[    7.080000] Probing IDE interface ide1...

[    7.500000] hdc: WDC WD2500LB-55EDA0, ATA DISK drive

[    7.780000] hdd: WDC WD2500LB-55EDA0, ATA DISK drive

[    7.948000] hdc: max request size: 512KiB

[    7.952000] hdc: 488397168 sectors (250059 MB) w/2048KiB Cache,

CHS=30401/255/63, UDMA(33)

[    7.952000] hdc: cache flushes supported

[    7.952000]  hdc: hdc1

[    8.252000] md: md0 stopped.

[    8.252000] md: unbind<sdb1>

[    8.252000] md: export_rdev(sdb1)

[    8.252000] md: unbind<sda1>

[    8.252000] md: export_rdev(sda1)

[    8.504000] Attempting manual resume

[    8.504000] swsusp: Resume From Partition 3:5

[    8.504000] PM: Checking swsusp image.

[    8.504000] PM: Resume from disk failed.

[    8.508000] md: invalid raid superblock magic on sda

[    8.508000] md: sda has invalid sb, not importing!

[    8.508000] md: md_import_device returned -22

[    8.508000] md: invalid raid superblock magic on sda

[    8.508000] md: sda has invalid sb, not importing!

[    8.508000] md: md_import_device returned -22

[    8.508000] md: bind<sda1>

[    8.512000] md: bind<hdc>

[    8.512000] md: bind<sdb1>

[    8.544000] EXT3-fs: INFO: recovery required on readonly

filesystem.

[    8.544000] EXT3-fs: write access will be enabled during recovery.

[    8.844000] md: md0 stopped.

[    8.844000] md: unbind<sdb1>

[    8.844000] md: export_rdev(sdb1)

[    8.844000] md: unbind<hdc>

[    8.844000] md: export_rdev(hdc)

[    8.844000] md: unbind<sda1>

[    8.844000] md: export_rdev(sda1)

[    9.104000] md: bind<hdd1>

[    9.104000] md: bind<sda1>

[    9.104000] md: bind<hdb1>

[    9.112000] md: bind<hdc>

[    9.112000] md: bind<sdb1>

[    9.368000] md: md0 stopped.

[    9.368000] md: unbind<sdb1>

[    9.368000] md: export_rdev(sdb1)

[    9.368000] md: unbind<hdc>

[    9.368000] md: export_rdev(hdc)

[    9.368000] md: unbind<hdb1>

[    9.368000] md: export_rdev(hdb1)

[    9.368000] md: unbind<sda1>

[    9.368000] md: export_rdev(sda1)

[    9.368000] md: unbind<hdd1>

[    9.368000] md: export_rdev(hdd1)

.. clean md0's FS ..

[    9.696000] md: bind<hdd1>

[    9.696000] md: bind<sda1>

[    9.708000] md: bind<hdb1>

[    9.720000] md: bind<hdc>

[    9.720000] md: bind<sdb1>

[    9.780000] EXT3-fs: mounted filesystem with ordered data mode.

[  25.952000] r8169: eth0: link up

[  26.256000] NET: Registered protocol family 10

[  26.256000] lo: Disabled Privacy Extensions

[  27.264000] md: md0 stopped.

[  27.264000] md: unbind<sdb1>

[  27.264000] md: export_rdev(sdb1)

[  27.264000] md: unbind<hdc>

[  27.264000] md: export_rdev(hdc)

[  27.264000] md: unbind<hdb1>

[  27.264000] md: export_rdev(hdb1)

[  27.264000] md: unbind<sda1>

[  27.264000] md: export_rdev(sda1)

[  27.264000] md: unbind<hdd1>

[  27.264000] md: export_rdev(hdd1)

[  27.472000] md: bind<hdd1>

[  27.472000] md: bind<sda1>

[  27.472000] md: bind<hdb1>

[  27.480000] md: bind<hdc>

[  27.480000] md: bind<sdb1>

[  27.480000] md: kicking non-fresh hdc from array!

[  27.480000] md: unbind<hdc>

[  27.480000] md: export_rdev(hdc)

[  27.484000] md: md0: raid array is not clean -- starting background

reconstruction

[  27.572000] raid5: device sdb1 operational as raid disk 0

[  27.572000] raid5: device hdb1 operational as raid disk 4

[  27.572000] raid5: device sda1 operational as raid disk 3

[  27.572000] raid5: device hdd1 operational as raid disk 2

[  27.572000] raid5: cannot start dirty degraded array for md0

[  27.572000] RAID5 conf printout:

[  27.572000]  --- rd:5 wd:4

[  27.572000]  disk 0, o:1, dev:sdb1

[  27.572000]  disk 2, o:1, dev:hdd1

[  27.572000]  disk 3, o:1, dev:sda1

[  27.572000]  disk 4, o:1, dev:hdb1

[  27.572000] raid5: failed to run raid set md0

[  27.572000] md: pers->run() failed ...



Then this is the output from after I fix it:

[ 1600.328000]  hdc: hdc1

[ 1602.332000]  hdc: hdc1

[ 1624.644000] md: bind<hdc1>

[ 1643.792000] raid5: device hdc1 operational as raid disk 1

[ 1643.792000] raid5: device sdb1 operational as raid disk 0

[ 1643.792000] raid5: device hdb1 operational as raid disk 4

[ 1643.792000] raid5: device sda1 operational as raid disk 3

[ 1643.792000] raid5: device hdd1 operational as raid disk 2

[ 1643.792000] raid5: allocated 5245kB for md0

[ 1643.792000] raid5: raid level 5 set md0 active with 5 out of 5

devices, algorithm 2

[ 1643.792000] RAID5 conf printout:

[ 1643.792000]  --- rd:5 wd:5

[ 1643.792000]  disk 0, o:1, dev:sdb1

[ 1643.792000]  disk 1, o:1, dev:hdc1

[ 1643.792000]  disk 2, o:1, dev:hdd1

[ 1643.792000]  disk 3, o:1, dev:sda1

[ 1643.792000]  disk 4, o:1, dev:hdb1

[ 1643.792000] md: resync of RAID array md0

[ 1643.792000] md: minimum _guaranteed_  speed: 1000 KB/sec/disk.

[ 1643.792000] md: using maximum available idle IO bandwidth (but not

more than 200000 KB/sec) for resync.

[ 1643.792000] md: using 128k window, over a total of 244195904

blocks.