在使用实际设备之前，尝试熟悉一些 raid 管理选项。因此，我正在使用 USB 记忆棒上的几个小分区。
目标是通过一个附加分区来扩展现有的 raid6（具有 4 个分区）。我使用了
mdadm --add /dev/md127 /dev/sdd9
mdadm -v --grow --raid-devices=5 /dev/md127
这似乎成功启动了重塑过程。然而，重塑过程已经停留在 0% 大约一个小时了：
as01449@P-H-287-04:~> cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md127 : active raid6 sdd9[4] sdd8[3] sdd7[2] sdd6[1] sdd5[0]
2099200 blocks super 1.2 level 6, 512k chunk, algorithm 2 [5/5] [UUUUU]
[>....................] reshape = 0.0% (0/1049600) finish=41.7min speed=406K/sec
unused devices: <none>
as01449@P-H-287-04:~> sudo mdadm --detail /dev/md127 /dev/md127:
Version : 1.2
Creation Time : Thu Nov 10 03:52:45 2016
Raid Level : raid6
Array Size : 2099200 (2.00 GiB 2.15 GB)
Used Dev Size : 1049600 (1025.17 MiB 1074.79 MB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Thu Nov 10 04:19:00 2016
State : clean, reshaping
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Reshape Status : 0% complete
Delta Devices : 1, (4->5)
Name : P-H-287-04.site:raidbackup (local to host P-H-287-04.site)
UUID : a8bed6ee:57936286:509a6406:63a314e3
Events : 22
Number Major Minor RaidDevice State
0 8 53 0 active sync /dev/sdd5
1 8 54 1 active sync /dev/sdd6
2 8 55 2 active sync /dev/sdd7
3 8 56 3 active sync /dev/sdd8
4 8 57 4 active sync /dev/sdd9
预计完成时间一直在增加。我遗漏了什么？
答案1
人mdadm：
--backup-file=
This is needed when --grow is used to increase the number of
raid-devices in a RAID5 or RAID6 if there are no spare devices
available, or to shrink, change RAID level or layout. See the
GROW MODE section below on RAID-DEVICES CHANGES. The file must
be stored on a separate device, not on the RAID array being
reshaped.