Hi, I've been spending the afternoon upgrading my home server and I'm
having an issue with creating a RAID5 array to hold the data. Note
that the OS is running on another disk and is not included on the
RAID5 array and that I am using Software Raid under 10.3.
To go into the RAID5 array I have six 500GB disks. Each of these has
a single Linux Raid unformatted primary partition; sda1, sdb1, sdd1,
sde1, sdf1 and sdg1. When I go to create the array md0 it does not
give any errors but when I list the detail on the array afterwards it
says that it is in a degraded state with only 5 disks in use and 1
disk as spare instead of all 6 in use.
I have tried creating the array with the Yast2 GUI, (on the running
system not during the install process), and from the command line
using:
mdadm -C /dev/md0 -v -n 6 -c 4096 -l 5 /dev/sda1 /dev/sdb1 /dev/sdd1
/dev/sde1 /dev/sdf1 /dev/sdg1
with the same result. It also seems that the disk which is set to
spare is the last one given so if I reorder the disks and add
/dev/sde1 last then that will become the spare instead of /dev/sdg1,
(which seems to indicate that it isn't an issue with one particular
disk).
What I see when I look at the array is as follows:
orb:/etc # mdadm --detail --scan -vvv
/dev/md0:
Version : 00.90.03
Creation Time : Sun Dec 2 17:27:38 2007
Raid Level : raid5
Array Size : 2441912320 (2328.79 GiB 2500.52 GB)
Used Dev Size : 488382464 (465.76 GiB 500.10 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Sun Dec 2 17:27:38 2007
State : clean, degraded
Active Devices : 5
Working Devices : 6
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 4096K
UUID : 837eecb4:28f004fb:0e4f8c91:f584a4b1
Events : 0.1
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 49 2 active sync /dev/sdd1
3 8 65 3 active sync /dev/sde1
4 8 81 4 active sync /dev/sdf1
5 0 0 5 removed
6 8 97 - spare /dev/sdg1
Previously I had an array of four 200GB disks and all four showed as
active sync so that is what I was expecting here too and I was
expecting to have an array size ~3TB with ~2.5TB usable.
All disks have been checked with the Samsung diagnostic tool and show
to be clear from hardware errors.
Does anybody know anything about this who could throw some light on
why this is occurring and what I can do to correct it?
Many Thanks
Tim
--
Tim Hempstead
[EMAIL PROTECTED]
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