Wednesday 06 February 2008 11:43:12:
> On Wednesday February 6, admin@xxxxxxxxx wrote:
> >
> > > Maybe the kernel has been told to forget about the partitions of
> > > /dev/sdb.
> >
> > But fdisk/cfdisk has no problem whatsoever finding the partitions .
>
> It is looking at the partition table on disk. Not at the kernel's
> idea of partitions, which is initialised from that table...
Aha! Thanks for this bit. I get it now.
> What does
>
> cat /proc/partitions
>
> say?
Note: I have reconfigured udev now to associate device names with serial
numbers (below)
% cat /proc/partitions
major minor #blocks name
8 0 390711384 sda
8 1 390708801 sda1
8 16 390711384 sdb
8 17 390708801 sdb1
8 32 390711384 sdc
8 33 390708801 sdc1
8 48 390710327 sdd
8 49 390708801 sdd1
8 64 390711384 sde
8 65 390708801 sde1
8 80 390711384 sdf
8 81 390708801 sdf1
3 64 78150744 hdb
3 65 1951866 hdb1
3 66 7815622 hdb2
3 67 4883760 hdb3
3 68 1 hdb4
3 69 979933 hdb5
3 70 979933 hdb6
3 71 61536951 hdb7
9 1 781417472 md1
9 0 781417472 md0
/dev/disk/by-id % ls -l
total 0
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-ST380023A_3KB0MV22 -> ../../hdb
lrwxrwxrwx 1 root root 10 2008-02-06 13:34 ata-ST380023A_3KB0MV22-part1 -> ../../hdb1
lrwxrwxrwx 1 root root 10 2008-02-06 13:34 ata-ST380023A_3KB0MV22-part2 -> ../../hdb2
lrwxrwxrwx 1 root root 10 2008-02-06 13:34 ata-ST380023A_3KB0MV22-part3 -> ../../hdb3
lrwxrwxrwx 1 root root 10 2008-02-06 13:34 ata-ST380023A_3KB0MV22-part4 -> ../../hdb4
lrwxrwxrwx 1 root root 10 2008-02-06 13:34 ata-ST380023A_3KB0MV22-part5 -> ../../hdb5
lrwxrwxrwx 1 root root 10 2008-02-06 13:34 ata-ST380023A_3KB0MV22-part6 -> ../../hdb6
lrwxrwxrwx 1 root root 10 2008-02-06 13:34 ata-ST380023A_3KB0MV22-part7 -> ../../hdb7
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1696130 -> ../../d_6
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1696130-part1 -> ../../d_6
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1707974 -> ../../d_5
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1707974-part1 -> ../../d_5
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1795228 -> ../../d_1
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1795228-part1 -> ../../d_1
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1795364 -> ../../d_3
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1795364-part1 -> ../../d_3
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1798692 -> ../../d_2
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1798692-part1 -> ../../d_2
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1800255 -> ../../d_4
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 ata-WDC_WD4000KD-00N-WD-WMAMY1800255-part1 -> ../../d_4
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1696130 -> ../../d_6
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1696130-part1 -> ../../d_6
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1707974 -> ../../d_5
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1707974-part1 -> ../../d_5
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1795228 -> ../../d_1
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1795228-part1 -> ../../d_1
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1795364 -> ../../d_3
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1795364-part1 -> ../../d_3
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1798692 -> ../../d_2
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1798692-part1 -> ../../d_2
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1800255 -> ../../d_4
lrwxrwxrwx 1 root root 9 2008-02-06 13:34 scsi-S_WD-WMAMY1800255-part1 -> ../../d_4
I have no idea why udev can't allocate /dev/d_1p1 to partition 1 on disk d_1. I have
explicitly asked it to do that:
/etc/udev/rules.d % cat z24_disks_domeny.rules
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1795228", NAME="d_1"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1795228-part1", NAME="d_1p1"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1798692", NAME="d_2"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1798692-part1", NAME="d_2p1"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1795364", NAME="d_3"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1795364-part1", NAME="d_3p1"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1800255", NAME="d_4"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1800255-part1", NAME="d_4p1"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1707974", NAME="d_5"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1707974-part1", NAME="d_5p1"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1696130", NAME="d_6"
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL_SHORT}=="WD-WMAMY1696130-part1", NAME="d_6p1"
/etc/udev/rules.d % cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4]
md0 : active(auto-read-only) raid5 sdc1[0] sde1[3](S) sdd1[1]
781417472 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]
md1 : active(auto-read-only) raid5 sdf1[0] sdb1[3](S) sda1[1]
781417472 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]
md0 consists of sdc1, sde1 and sdd1 even though when creating I asked it to
use d_1, d_2 and d_3 (this is probably written on the particular disk/partition itself,
but I have no idea how to clean this up - mdadm --zero-superblock /dev/d_1
again produces "mdadm: Couldn't open /dev/d_1 for write - not zeroing")
/etc/mdadm % mdadm -Q --detail /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Wed Feb 6 12:24:49 2008
Raid Level : raid5
Array Size : 781417472 (745.22 GiB 800.17 GB)
Used Dev Size : 390708736 (372.61 GiB 400.09 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Feb 6 12:34:00 2008
State : clean, degraded
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
UUID : f83e3541:b5b63f10:a6d4720f:52a5051f
Events : 0.14
Number Major Minor RaidDevice State
0 8 33 0 active sync /dev/d_1
1 8 49 1 active sync /dev/d_2
2 0 0 2 removed
3 8 65 - spare /dev/d_3
--
Marcin Krol
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