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mdadm -D and -E use inconsistent units and round incorrectly. It
appears that -E lists the size in sectors, but -D lists it in KiB, and
both list 1024.16 MiB on a loop device that is exactly 1024 MiB long.
Given the listed KiB/sector count, the correct value should be
1023.99 MiB. This happens both with mdadm 3.2.3-2ubuntu1 on Ubuntu
12.04, as well as with a freshly built git head.
mdadm -E /dev/loop0
/dev/loop0:
Magic : a92b4efc
Version : 1.0
Feature Map : 0x0
Array UUID : 7c24e61e:4e28fb01:79299569:864ea4e3
Name : devserv:1 (local to host devserv)
Creation Time : Tue Feb 12 10:36:51 2013
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 2097128 (1024.16 MiB 1073.73 MB)
Array Size : 1048564 (1024.16 MiB 1073.73 MB)
Super Offset : 2097136 sectors
State : clean
Device UUID : f4cd17ea:5a311275:f74f2fa2:ffa1b41a
Update Time : Tue Feb 12 10:39:36 2013
Checksum : 8314a161 - correct
Events : 8
Device Role : Active device 0
Array State : A. ('A' == active, '.' == missing, 'R' == replacing)
mdadm -D /dev/md1
/dev/md1:
Version : 1.0
Creation Time : Tue Feb 12 10:36:51 2013
Raid Level : raid1
Array Size : 1048564 (1024.16 MiB 1073.73 MB)
Used Dev Size : 1048564 (1024.16 MiB 1073.73 MB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent
Update Time : Tue Feb 12 10:39:36 2013
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Name : devserv:1 (local to host devserv)
UUID : 7c24e61e:4e28fb01:79299569:864ea4e3
Events : 8
Number Major Minor RaidDevice State
0 7 0 0 active sync /dev/loop0
2 0 0 2 removed
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