Dear list members, some time ago, I bought two external Seagate 2 TB USB 3.0 HDDs in order to expand my local storage (all internal slots are already in use). Having created a RAID1 with MDADM just as normal, it all seemed to work, until at one system startup MDADM told me via local mail that the Array was degraded. In fact, one of the devices had not been recognized by the system. Reconnecting the drive however, did not allow me to simply continue as normal -- I had to add the device back into the RAID and thereby triggered a resync. This did not seem a problem at the beginning, but as the problem occurred a second time, I thought I should search for a solution (which did not bring up anything interesting or related) and then ask:
Is there any means to configure MDADM (or such) to make sure that all
devices are recognized before attempting to start the array so that I
could manually reconnect the missing disk and then start the array
without any resync?
If not, might it be a good idea to write a script to check if the
devices are available and only then enable that RAID?
I want to avoid doing superflous resyncs as this always takes a lot of
time and seems to be an unnecessary load for the drives.
Raid details (should they be relevant)
# mdadm --detail /dev/md3
/dev/md3:
Version : 1.2
Creation Time : Fri Aug 1 23:12:16 2014
Raid Level : raid1
Array Size : 1953381184 (1862.89 GiB 2000.26 GB)
Used Dev Size : 1953381184 (1862.89 GiB 2000.26 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Thu Sep 11 17:48:03 2014
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Name : masysma-3:3 (local to host masysma-3)
UUID : 5885863a:ca3648ff:7f73d47f:53f0476a
Events : 75
Number Major Minor RaidDevice State
2 8 129 0 active sync /dev/sdi1
1 8 145 1 active sync /dev/sdj1
Also, this is the relevant line from mdadm.conf
ARRAY /dev/md/3 metadata=1.2 UUID=5885863a:ca3648ff:7f73d47f:53f0476a
name=masysma-3:3
TIA
Linux-Fan
--
http://masysma.lima-city.de/
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