I have a raid1 comprised of a local physical device (/dev/sda) and a
network block device (/dev/nbd0).
When the machine hosting the network block device comes up, however,
it creates /dev/md127.
Why?
On the machine hosting the network block device, /dev/sdb is what
backs /dev/nbd0.
This is physical storage for /dev/nbd0:
frank:~ # mdadm --examine /dev/sdb
/dev/sdb:
Magic : a92b4efc
Version : 1.0
Feature Map : 0x1
Array UUID : cf24d099:9e174a79:2a2f6797:dcff1420
Name : turnip:11
Creation Time : Mon Dec 15 07:06:13 2008
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 160086384 (76.34 GiB 81.96 GB)
Array Size : 156247976 (74.50 GiB 80.00 GB)
Used Dev Size : 156247976 (74.50 GiB 80.00 GB)
Super Offset : 160086512 sectors
State : clean
Device UUID : 01524a75:c309869c:6da972c9:084115c6
Internal Bitmap : 2 sectors from superblock
Flags : write-mostly
Update Time : Tue Mar 24 11:41:41 2009
Checksum : 643e99c0 - correct
Events : 111338
Array Slot : 2 (failed, failed, empty, 1)
Array State : _u 2 failed
frank:~ #
As you can see, the "Name" attribute is "turnip:11". The hostname is
"frank". Why did frank bring up the device?
The only thing in frank's /etc/mdadm.conf is "HOMEHOST frank" which I
didn't think was necessary anyway.
--
Jon
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