我有一个3磁盘RAID 5arrays，我试图添加第四个磁盘。
mdadm --add /dev/md6 /dev/sdb1 mdadm --grow --raid-devices=4 /dev/md6 这个操作成功开始，直到达到51.1％
cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty] md6 : active raid5 sda1[0] sdb1[5] sdf1[3] sde1[4] 3906764800 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU] [==========>..........] reshape = 51.1% (998533632/1953382400) finish=9046506.1min speed=1K/sec bitmap: 0/15 pages [0KB], 65536KB chunk
它一直坐在同一个998533632的位置上好几天。 我已经尝试了几次重启，但它从来没有进展。 停止arrays，或试图启动逻辑卷在它挂起。 改变最小/最大速度参数不起作用。 当我重新启动和类似的arrays速度稳步下降到几乎0。
mdadm --assemble /dev/md6 --verbose --uuid 90c2b5c3:3bbfa0d7:a5efaeed:726c43e2
我还没有尝试过比重新启动更激烈的事情，下面是尽可能多的信息，我认为在这个阶段提供。 请让我知道我还能做些什么。 我很乐意改变内核，内核configuration或其他任何需要得到更好的信息。
内核：4.4.3 mdadm 3.4
ps aux | grep md6 root 5041 99.9 0.0 0 0 ? R 07:10 761:58 [md6_raid5] root 5042 0.0 0.0 0 0 ? D 07:10 0:00 [md6_reshape]
这是一致的。 raid组件上100％cpu，但不是重塑
mdadm --detail --verbose /dev/md6 /dev/md6: Version : 1.2 Creation Time : Fri Aug 29 21:13:52 2014 Raid Level : raid5 Array Size : 3906764800 (3725.78 GiB 4000.53 GB) Used Dev Size : 1953382400 (1862.89 GiB 2000.26 GB) Raid Devices : 4 Total Devices : 4 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Wed Apr 27 07:10:07 2016 State : clean, reshaping Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 512K Reshape Status : 51% complete Delta Devices : 1, (3->4) Name : Alpheus:6 (local to host Alpheus) UUID : 90c2b5c3:3bbfa0d7:a5efaeed:726c43e2 Events : 47975 Number Major Minor RaidDevice State 0 8 1 0 active sync /dev/sda1 4 8 65 1 active sync /dev/sde1 3 8 81 2 active sync /dev/sdf1 5 8 17 3 active sync /dev/sdb1
看看单个磁盘，我可以看到MD6成员的小活动。 这个活动往往与/ proc / mdstat报告的整体速率相匹配
iostat Linux 4.4.3-gentoo (Alpheus) 04/27/2016 _x86_64_ (4 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 1.84 0.00 24.50 0.09 0.00 73.57 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn sda 0.02 2.72 1.69 128570 79957 sdb 0.01 0.03 1.69 1447 79889 sdd 3.85 2.27 56.08 106928 2646042 sde 0.02 2.73 1.69 128610 79961 sdf 0.02 2.72 1.69 128128 79961 sdc 4.08 5.44 56.08 256899 2646042 md0 2.91 7.62 55.08 359714 2598725 dm-0 0.00 0.03 0.00 1212 0 dm-1 0.00 0.05 0.00 2151 9 dm-2 2.65 6.52 3.42 307646 161296 dm-3 0.19 1.03 51.66 48377 2437420 md6 0.00 0.02 0.00 1036 0
dmesg看起来不错
dmesg [ 1199.426995] md: bind<sde1> [ 1199.427779] md: bind<sdf1> [ 1199.428379] md: bind<sdb1> [ 1199.428592] md: bind<sda1> [ 1199.429260] md/raid:md6: reshape will continue [ 1199.429274] md/raid:md6: device sda1 operational as raid disk 0 [ 1199.429275] md/raid:md6: device sdb1 operational as raid disk 3 [ 1199.429276] md/raid:md6: device sdf1 operational as raid disk 2 [ 1199.429277] md/raid:md6: device sde1 operational as raid disk 1 [ 1199.429498] md/raid:md6: allocated 4338kB [ 1199.429807] md/raid:md6: raid level 5 active with 4 out of 4 devices, algorithm 2 [ 1199.429810] RAID conf printout: [ 1199.429811] --- level:5 rd:4 wd:4 [ 1199.429812] disk 0, o:1, dev:sda1 [ 1199.429814] disk 1, o:1, dev:sde1 [ 1199.429816] disk 2, o:1, dev:sdf1 [ 1199.429817] disk 3, o:1, dev:sdb1 [ 1199.429993] created bitmap (15 pages) for device md6 [ 1199.430297] md6: bitmap initialized from disk: read 1 pages, set 0 of 29807 bits [ 1199.474604] md6: detected capacity change from 0 to 4000527155200 [ 1199.474611] md: reshape of RAID array md6 [ 1199.474613] md: minimum _guaranteed_ speed: 1000 KB/sec/disk. [ 1199.474614] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reshape. [ 1199.474617] md: using 128k window, over a total of 1953382400k.
lsblk供参考
lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 1.8T 0 disk └─sda1 8:1 0 1.8T 0 part └─md6 9:6 0 3.7T 0 raid5 sdb 8:16 0 1.8T 0 disk └─sdb1 8:17 0 1.8T 0 part └─md6 9:6 0 3.7T 0 raid5 sdc 8:32 0 2.7T 0 disk ├─sdc1 8:33 0 16M 0 part └─sdc2 8:34 0 2.7T 0 part └─md0 9:0 0 2.7T 0 raid1 ├─vg--mirror-swap 253:0 0 4G 0 lvm [SWAP] ├─vg--mirror-boot 253:1 0 256M 0 lvm /boot ├─vg--mirror-root 253:2 0 256G 0 lvm / └─vg--mirror-data--mirror 253:3 0 2.5T 0 lvm /data/mirror sdd 8:48 0 2.7T 0 disk ├─sdd1 8:49 0 16M 0 part └─sdd2 8:50 0 2.7T 0 part └─md0 9:0 0 2.7T 0 raid1 ├─vg--mirror-swap 253:0 0 4G 0 lvm [SWAP] ├─vg--mirror-boot 253:1 0 256M 0 lvm /boot ├─vg--mirror-root 253:2 0 256G 0 lvm / └─vg--mirror-data--mirror 253:3 0 2.5T 0 lvm /data/mirror sde 8:64 0 1.8T 0 disk └─sde1 8:65 0 1.8T 0 part └─md6 9:6 0 3.7T 0 raid5 sdf 8:80 0 1.8T 0 disk └─sdf1 8:81 0 1.8T 0 part └─md6 9:6 0 3.7T 0 raid5
感谢任何指针