Daniel Pittman wrote:
Mitchell Laks <mlaks@xxxxxxxxxxx> writes:
G'day Mitchell.
I notice on my system that the hard drives "device names" can change.
The hard drives are connected to the motherboard SATA connectors or to
PCI SATA cards. They get different "names" /dev/sda or /dev/sdc
depending how many of the cards are "active".
For instance the hard drives on the motherboard itself are called
/dev/sde and /dev/sdf if there are hard drives on the 2 PCI cards and
are called /dev/sda and /dev/sdb if there are none.
Well, one solution is udev, but since you prefer to avoid that...
[...]
Now I am confused: unfortunately this does not seem to help me:
if it relys on the configuration file /etc/mdadm/mdadm.conf
this config file - i create with the aid of mdadm --detail --scan
seems to still have the (problematic) "variable" device names in it.
...you can simply remove the 'device names' variable, and list the
theoretically possible devices for MD stuff in the configuration:
DEVICE /dev/hd*
DEVICE /dev/sd*
That will include all the IDE and SCSI disks (including SATA), so they
will be scanned at an appropriate time.
Then, list your arrays:
ARRAY /dev/md2 level=raid1 num-devices=2 UUID=529d70fa:e5fe992b:ceb05593:bfcc6c25
That will cause mdadm to scan all those device entries (all the disks
and partitions) looking for an array with the right UUID, and assemble
it from all the components it finds.
I am trying to do this with my 8 (currently only 7 since /dev/hdk is off
line being replaced) disk raid5 array. mdadm --detail /dev/md0 gives :
"
/dev/md0:
Version : 00.90.02
Creation Time : Sat Aug 6 10:18:41 2005
Raid Level : raid5
Array Size : 976804480 (931.55 GiB 1000.25 GB)
Device Size : 195360896 (186.31 GiB 200.05 GB)
Raid Devices : 6
Total Devices : 7
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Sat Dec 31 12:35:32 2005
State : clean
Active Devices : 6
Working Devices : 7
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
UUID : 15bfec75:595ac793:0914f8ee:862effd8
Events : 0.838124
Number Major Minor RaidDevice State
0 33 0 0 active sync /dev/hde
1 34 0 1 active sync /dev/hdg
2 56 0 2 active sync /dev/hdi
3 8 0 3 active sync /dev/sda
4 8 16 4 active sync /dev/sdb
5 8 32 5 active sync /dev/sdc
6 8 48 - spare /dev/sdd
"
I am confused why there are only 4 UUIDs, when there are 7 devices
listed...what should I put in my mdadm.conf file, which is currently :
"
DEVICE /dev/hd[egik] /dev/sd[abcd]
ARRAY /dev/md0 level=raid5 num-devices=6 spares=1
devices=/dev/hde,/dev/hdg,/dev/hdi,/dev/sda,/dev/sdb,/dev/sdc,/dev/sdd
"
What do I put for UUIDs for the 7 devices?
Max.
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
