我向 RAID 5 添加了另一个驱动器，然后将其迁移到 RAID 6。一切顺利，但现在该过程似乎停留在 63.2%，并且 md2_raid6 占用了 99.9% 的 CPU。
RAID 详细信息：
/dev/md/2：版本：1.2 创建时间：2014 年 1 月 16 日星期四 21:17:54 突袭级别：raid6 阵列大小：19534435840（18629.49 GiB 20003.26 GB）已用设备大小：3906887168（3725.90 GiB 4000.65 GB）突袭设备：8 总设备数：8 持久性：超级块是持久的
意图位图：内部
Update Time : Sun Jun 29 09:37:25 2014 State : active, reshaping Active Devices : 8 Working Devices : 8 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 512K重塑状态：完成度 63% Delta 设备：1，（7->8）
Name : random:2 UUID : a2636675:62df921b:94c0ff95:64fca10e Events : 83461 Number Major Minor RaidDevice State 0 8 64 0 active sync /dev/sde 1 8 96 1 active sync /dev/sdg 2 8 80 2 active sync /dev/sdf 3 8 48 3 active sync /dev/sdd 4 8 128 4 active sync /dev/sdi 5 8 112 5 active sync /dev/sdh 6 8 144 6 active sync /dev/sdj 7 8 32 7 active sync /dev/sdc
mdstat 说：
个性：[raid6] [raid5] [raid4] md2：活动 raid6 sde[0] sdc[7] sdj[6] sdh[5] sdi[4] sdd[3] sdf[2] sdg[1] 19534435840 块超级 1.2 级别 6，512k 块，算法 2 [8/8] [UUUUU UUU] [============>........] 重塑 = 63.2% (2469935104/3906887168) 完成=94 2584.6 分钟速度=25K/秒位图：1/30 页 [4KB]，65536KB 块
未使用的设备：
速度正在下降，并且似乎卡在了块 2469935104。我也无法再安装该阵列，因为安装命令卡住了。
dmesg 说：
> [ 374.558818] md/raid:md2: not clean -- starting background reconstruction
> [ 374.558821] md/raid:md2: reshape will continue
> [ 374.558834] md/raid:md2: device sdh operational as raid disk 0
> [ 374.558835] md/raid:md2: device sdj operational as raid disk 1
> [ 374.558836] md/raid:md2: device sdi operational as raid disk 2
> [ 374.558837] md/raid:md2: device sdg operational as raid disk 3
> [ 374.558838] md/raid:md2: device sde operational as raid disk 4
> [ 374.558839] md/raid:md2: device sdc operational as raid disk 7
> [ 374.558840] md/raid:md2: device sdf operational as raid disk 6
> [ 374.558840] md/raid:md2: device sdd operational as raid disk 5
> [ 374.559378] md/raid:md2: allocated 0kB
> [ 374.559414] md/raid:md2: raid level 6 active with 8 out of 8 devices, algorithm 2
> [ 374.559416] RAID conf printout:
> [ 374.559417] --- level:6 rd:8 wd:8
> [ 374.559418] disk 0, o:1, dev:sdh
> [ 374.559420] disk 1, o:1, dev:sdj
> [ 374.559421] disk 2, o:1, dev:sdi
> [ 374.559422] disk 3, o:1, dev:sdg
> [ 374.559424] disk 4, o:1, dev:sde
> [ 374.559425] disk 5, o:1, dev:sdd
> [ 374.559426] disk 6, o:1, dev:sdf
> [ 374.559428] disk 7, o:1, dev:sdc
> [ 374.559582] created bitmap (30 pages) for device md2
> [ 374.560264] md2: bitmap initialized from disk: read 2 pages, set 1 of 59615 bits
> [ 375.292856] md2: detected capacity change from 0 to 20003262300160
> [ 375.292876] md: reshape of RAID array md2
> [ 375.292879] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
> [ 375.292881] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reshape.
> [ 375.292889] md: using 128k window, over a total of 3906887168k.
> [ 375.448756] md2: unknown partition table
过了一会儿，dmesg 显示：
> [ 599.954327] INFO: task md2_reshape:2635 blocked for more than 120 seconds.
> [ 599.954330] Not tainted 3.13.0-30-generic #54-Ubuntu
> [ 599.954331] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 599.954332] md2_reshape D ffff88042fb94440 0 2635 2 0x00000000
> [ 599.954335] ffff880415127ae8 0000000000000002 ffff880414258000 ffff880415127fd8
> [ 599.954337] 0000000000014440 0000000000014440 ffff880414258000 ffff880416d15dc8
> [ 599.954339] ffff880416d15c18 ffff880416d15c00 ffff880415127b50 ffff880416d15e18
> [ 599.954341] Call Trace:
> [ 599.954347] [<ffffffff8171e749>] schedule+0x29/0x70
> [ 599.954359] [<ffffffffa0380862>] get_active_stripe+0x1d2/0x7c0 [raid456]
> [ 599.954364] [<ffffffff810aaa44>] ? __wake_up+0x44/0x50
> [ 599.954367] [<ffffffff810aaea0>] ? prepare_to_wait_event+0x100/0x100
> [ 599.954370] [<ffffffffa038126a>] reshape_request+0x24a/0x950 [raid456]
> [ 599.954372] [<ffffffff810aaea0>] ? prepare_to_wait_event+0x100/0x100
> [ 599.954375] [<ffffffffa0385c5f>] sync_request+0x23f/0x3e0 [raid456]
> [ 599.954378] [<ffffffff815a41f1>] ? is_mddev_idle+0xd1/0x140
> [ 599.954380] [<ffffffff815a74d3>] md_do_sync+0x993/0xdc0
> [ 599.954382] [<ffffffff8171e2d1>] ? __schedule+0x381/0x7d0
> [ 599.954384] [<ffffffff815a4088>] md_thread+0x118/0x130
> [ 599.954386] [<ffffffff810aaea0>] ? prepare_to_wait_event+0x100/0x100
> [ 599.954388] [<ffffffff815a3f70>] ? mddev_unlock+0xe0/0xe0
> [ 599.954390] [<ffffffff8108b322>] kthread+0xd2/0xf0
> [ 599.954392] [<ffffffff8108b250>] ? kthread_create_on_node+0x1d0/0x1d0
> [ 599.954395] [<ffffffff8172ac3c>] ret_from_fork+0x7c/0xb0
> [ 599.954397] [<ffffffff8108b250>] ? kthread_create_on_node+0x1d0/0x1d0
> [ 599.954398] INFO: task blkid:2637 blocked for more than 120 seconds.
> [ 599.954399] Not tainted 3.13.0-30-generic #54-Ubuntu
> [ 599.954399] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [ 599.954400] blkid D ffff88042fb14440 0 2637 1 0x00000004
> [ 599.954402] ffff880414a23930 0000000000000002 ffff8800c09e2fe0 ffff880414a23fd8
> [ 599.954403] 0000000000014440 0000000000014440 ffff8800c09e2fe0 ffff880416d15d98
> [ 599.954405] ffff880416d15c0c ffff880416d15c00 ffff880414a23998 ffff880416d15e18
> [ 599.954406] Call Trace:
> [ 599.954408] [<ffffffff8171e749>] schedule+0x29/0x70
> [ 599.954411] [<ffffffffa0380862>] get_active_stripe+0x1d2/0x7c0 [raid456]
> [ 599.954413] [<ffffffff810aaea0>] ? prepare_to_wait_event+0x100/0x100
> [ 599.954415] [<ffffffffa0385fdc>] make_request+0x1dc/0xc00 [raid456]
> [ 599.954417] [<ffffffff810aaea0>] ? prepare_to_wait_event+0x100/0x100
> [ 599.954419] [<ffffffff815a0f05>] md_make_request+0xd5/0x220
> [ 599.954431] [<ffffffff81150ce5>] ? mempool_alloc_slab+0x15/0x20
> [ 599.954435] [<ffffffff81334d42>] generic_make_request+0xc2/0x110
> [ 599.954436] [<ffffffff81334e01>] submit_bio+0x71/0x150
> [ 599.954439] [<ffffffff811f3e96>] ? bio_alloc_bioset+0x196/0x2a0
> [ 599.954442] [<ffffffff811eef35>] _submit_bh+0x135/0x200
> [ 599.954444] [<ffffffff811f1847>] block_read_full_page+0x1e7/0x2e0
> [ 599.954449] [<ffffffff811a1985>] ? kmem_cache_alloc+0x35/0x1e0
> [ 599.954450] [<ffffffff811f50f0>] ? I_BDEV+0x10/0x10
> [ 599.954453] [<ffffffff8116c395>] ? __inc_zone_page_state+0x35/0x40
> [ 599.954455] [<ffffffff8114ebeb>] ? add_to_page_cache_locked+0xbb/0x1b0
> [ 599.954457] [<ffffffff811f58c8>] blkdev_readpage+0x18/0x20
> [ 599.954458] [<ffffffff8115a8c8>] __do_page_cache_readahead+0x1e8/0x260
> [ 599.954460] [<ffffffff8115abed>] force_page_cache_readahead+0x6d/0xa0
> [ 599.954462] [<ffffffff8115af03>] page_cache_sync_readahead+0x43/0x50
> [ 599.954463] [<ffffffff81150a85>] generic_file_aio_read+0x4c5/0x700
> [ 599.954465] [<ffffffff811f5c6b>] blkdev_aio_read+0x4b/0x70
> [ 599.954468] [<ffffffff811bc05a>] do_sync_read+0x5a/0x90
> [ 599.954470] [<ffffffff811bc6f5>] vfs_read+0x95/0x160
> [ 599.954471] [<ffffffff811bd209>] SyS_read+0x49/0xa0
> [ 599.954473] [<ffffffff8172aeff>] tracesys+0xe1/0xe6