Managing Software RAIDs with EVMS
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6.6.3 Monitoring Status with mdadm
To view the RAID status with the
mdadm
command, enter the following at a terminal prompt:
mdadm -D /dev/
mdx
Replace
mdx
with the RAID device number.
Example 1: A Disk Fails
In the following example, only four of the five devices in the RAID are active (
Raid Devices :
5
,
Total Devices : 4
). When it was created, the component devices in the device were
numbered 0 to 5 and are ordered according to their alphabetic appearance in the list where they were
chosen, such as
/dev/sdg1
,
/dev/sdh1
,
/dev/sdi1
,
/dev/sdj1
, and
/dev/sdk1
. From
the pattern of filenames of the other devices, you determine that the device that was removed was
named
/dev/sdh1
.
/dev/md0:
Status Information
Description
Interpretation
Personalities : [raid5]
[raid4]
List of the RAIDs on the server
by RAID label.
You have two RAIDs defined
with labels of
raid5
and
raid4
.
md0 : active
raid5
sdg1[0] sdk1[4] sdj1[3]
sdi1[2]
<device> : <active | not active>
<RAID label you specified>
< storage object> [RAID order]
The RAID is active and
mounted at
/dev/evms/
md/md0
.
The RAID label is
raid5
.
The active segments are
sdg1
,
sdi1
,
sdj1
, and
sdk1
, as
ordered in the RAID.
The RAID numbering of 0 to 4
indicates that the RAID has 5
segments, and the second
segment
[1]
is missing from
the list. Based on the
segment names, the missing
segment is
sdh1
.
35535360 blocks level
5, 128k chunk,
algorithm 2 [5/4]
[U_UUU]
<number of blocks> blocks
level < 0 | 1 | 4 | 5 >
<stripe size in KB> chunk
algorithm <1 | 2 | 3 | 4 >
[number of devices/number of
working devices]
[U-UUU]
If the block size on the server is
4 KB, the total size of the
RAID (including parity) is
142 GB, with a data capacity
of 113.7 GB.
The stripe size is 128 KB.
The RAID is using left
symmetric.
algorithm <1 | 2 | 3 | 4 >
[number of devices/number of
working devices]
[U-UUU]
unused devices:
<none>
All segments in the RAID are in
use.
There are no spare devices
available on the server.
Summary of Contents for LINUX ENTERPRISE SERVER 10 - STORAGE ADMINISTRATION GUIDE 7-2007
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