I tried to reshape today, a raid6 array from seven devices up to eight. I ran mdadm 3.2.2, something like # mdadm /dev/md2 --grow -n 8 --layout=preserve and then, blammo! Dec 8 22:30:10 avclub kernel: [ 527.094708] RAID5 conf printout: Dec 8 22:30:10 avclub kernel: [ 527.094712] --- rd:8 wd:8 Dec 8 22:30:10 avclub kernel: [ 527.094714] disk 0, o:1, dev:sdc6 Dec 8 22:30:10 avclub kernel: [ 527.094715] disk 1, o:1, dev:sdf6 Dec 8 22:30:10 avclub kernel: [ 527.094717] disk 2, o:1, dev:sda6 Dec 8 22:30:10 avclub kernel: [ 527.094718] disk 3, o:1, dev:sdd6 Dec 8 22:30:10 avclub kernel: [ 527.094719] disk 4, o:1, dev:sdb6 Dec 8 22:30:10 avclub kernel: [ 527.094720] disk 5, o:1, dev:sde6 Dec 8 22:30:10 avclub kernel: [ 527.094721] disk 6, o:1, dev:sdg6 Dec 8 22:30:10 avclub kernel: [ 527.094722] disk 7, o:1, dev:sdh6 Dec 8 22:30:10 avclub kernel: [ 527.094876] md: reshape of RAID array md2 Dec 8 22:30:10 avclub kernel: [ 527.094886] md: minimum _guaranteed_ speed: 40000 KB/sec/disk. Dec 8 22:30:10 avclub kernel: [ 527.094892] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reshape. Dec 8 22:30:10 avclub kernel: [ 527.094912] md: using 128k window, over a total of 1371476928 blocks. Dec 8 22:30:11 avclub mdadm[2959]: RebuildStarted event detected on md device /dev/md2 Dec 8 22:30:11 avclub kernel: [ 527.515359] general protection fault: 0000 [#1] SMP Dec 8 22:30:11 avclub kernel: [ 527.515370] last sysfs file: /sys/devices/virtual/block/md2/md/sync_speed Dec 8 22:30:11 avclub kernel: [ 527.515376] CPU 5 Dec 8 22:30:11 avclub kernel: [ 527.515381] Modules linked in: binfmt_misc nfsd exportfs nfs lockd nfs_acl auth_rpcgss sunrpc snd_usb_audio snd_usb_lib snd_hda_codec_atihdmi fbcon tileblit font bitblit softcursor vga16fb vgastate snd_hda_codec_via snd_hda_intel snd_pcm_oss snd_hda_codec snd_mixer_ oss snd_hwdep snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device radeon ttm asus_atk0110 drm_kms_helper ppdev snd drm i2c_algo_bit parport_pc edac_core edac_mce_amd gspca_zc3xx gspca_main videodev v4l1_compat v4l2_compat_ioctl32 soundcore snd_page_alloc i2c_piix4 shpchp lp parport tcp_vegas raid10 raid456 async_pq async_xor xor async_memcpy usbhid async_raid6_recov hid raid6_pq async_tx raid1 raid0 pata_atiixp r8169 mii multipath ahci linear [last unloaded: kvm] Dec 8 22:30:11 avclub kernel: [ 527.515500] Pid: 528, comm: md2_raid6 Not tainted 2.6.32-32-generic #62-Ubuntu System Product Name Dec 8 22:30:11 avclub kernel: [ 527.515507] RIP: 0010:[<ffffffff812be15b>] [<ffffffff812be15b>] memcpy_c+0xb/0x20 Dec 8 22:30:11 avclub kernel: [ 527.515526] RSP: 0018:ffff880408985c18 EFLAGS: 00010246 Dec 8 22:30:11 avclub kernel: [ 527.515531] RAX: db73880000000000 RBX: ffff880408984000 RCX: 0000000000000200 Dec 8 22:30:11 avclub kernel: [ 527.515537] RDX: 0000000000000000 RSI: ffff880369717000 RDI: db73880000000000 Dec 8 22:30:11 avclub kernel: [ 527.515543] RBP: ffff880408985c80 R08: 0000000000001000 R09: ffff880408985ca0 Dec 8 22:30:11 avclub kernel: [ 527.515548] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880408985ca0 Dec 8 22:30:11 avclub kernel: [ 527.515553] R13: ffff880369741290 R14: 0000000000000000 R15: 0000000000000000 Dec 8 22:30:11 avclub kernel: [ 527.515560] FS: 00007f465923d7a0(0000) GS:ffff880028340000(0000) knlGS:00000000f6990760 Dec 8 22:30:11 avclub kernel: [ 527.515566] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b Dec 8 22:30:11 avclub kernel: [ 527.515571] CR2: 00007fe6aaf92000 CR3: 00000003c3a5e000 CR4: 00000000000006e0 Dec 8 22:30:11 avclub kernel: [ 527.515576] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Dec 8 22:30:11 avclub kernel: [ 527.515582] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Dec 8 22:30:11 avclub kernel: [ 527.515589] Process md2_raid6 (pid: 528, threadinfo ffff880408984000, task ffff88040b210000) Dec 8 22:30:11 avclub kernel: [ 527.515593] Stack: Dec 8 22:30:11 avclub kernel: [ 527.515596] ffffffffa004a0e7 ffff880408985c50 0000000000000000 0000000000000000 Dec 8 22:30:11 avclub kernel: [ 527.515604] <0> ffffea000bf10d08 0000000000000000 0000000000001000 ffff880408985c80 Dec 8 22:30:11 avclub kernel: [ 527.515614] <0> 0000000000000000 ffff8803696a6930 ffff880369741290 ffff880408985d70 Dec 8 22:30:11 avclub kernel: [ 527.515624] Call Trace: Dec 8 22:30:11 avclub kernel: [ 527.515639] [<ffffffffa004a0e7>] ? async_memcpy+0xe7/0x25c [async_memcpy] Dec 8 22:30:11 avclub kernel: [ 527.515654] [<ffffffffa00aaabb>] handle_stripe_expansion+0x14b/0x1e0 [raid456] Dec 8 22:30:11 avclub kernel: [ 527.515668] [<ffffffffa00ab113>] handle_stripe6+0x5c3/0xb40 [raid456] Dec 8 22:30:11 avclub kernel: [ 527.515680] [<ffffffffa00a794c>] ? __release_stripe+0xcc/0x1c0 [raid456] Dec 8 22:30:11 avclub kernel: [ 527.515692] [<ffffffffa00ac055>] handle_stripe+0x25/0x30 [raid456] Dec 8 22:30:11 avclub kernel: [ 527.515703] [<ffffffffa00ac452>] raid5d+0x202/0x320 [raid456] Dec 8 22:30:11 avclub kernel: [ 527.515716] [<ffffffff815416b9>] ? _spin_unlock_irqrestore+0x19/0x30 Dec 8 22:30:11 avclub kernel: [ 527.515725] [<ffffffff8141704c>] md_thread+0x5c/0x130 Dec 8 22:30:11 avclub kernel: [ 527.515735] [<ffffffff81084cb0>] ? autoremove_wake_function+0x0/0x40 Dec 8 22:30:11 avclub kernel: [ 527.515743] [<ffffffff81416ff0>] ? md_thread+0x0/0x130 Dec 8 22:30:11 avclub kernel: [ 527.515750] [<ffffffff81084936>] kthread+0x96/0xa0 Dec 8 22:30:11 avclub kernel: [ 527.515758] [<ffffffff810131ea>] child_rip+0xa/0x20 Dec 8 22:30:11 avclub kernel: [ 527.515766] [<ffffffff810848a0>] ? kthread+0x0/0xa0 Dec 8 22:30:11 avclub kernel: [ 527.515772] [<ffffffff810131e0>] ? child_rip+0x0/0x20 Dec 8 22:30:11 avclub kernel: [ 527.515776] Code: 81 ea d8 1f 00 00 48 3b 42 20 73 07 48 8b 50 f9 31 c0 c3 31 d2 48 c7 c0 f2 ff ff ff c3 90 90 90 48 89 f8 89 d1 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 Dec 8 22:30:11 avclub kernel: [ 527.515842] RIP [<ffffffff812be15b>] memcpy_c+0xb/0x20 Dec 8 22:30:11 avclub kernel: [ 527.515850] RSP <ffff880408985c18> Dec 8 22:30:11 avclub kernel: [ 527.515857] ---[ end trace 5146b1cc8ebe8dc1 ]--- Dec 8 22:30:11 avclub kernel: [ 527.515865] note: md2_raid6[528] exited with preempt_count 2 Dec 8 22:32:52 avclub kernel: Kernel logging (proc) stopped. I believe that last line shows me giving up. I am sad. Thankfully, after rebooting into single user mode, I was able to mdadm --assemble the array, and it appears to be working. Boy that was a rush! $ uname -aLinux avclub 2.6.32-32-generic #62-Ubuntu SMP Wed Apr 20 21:52:38 UTC 2011 x86_64 GNU/Linux Let me know if I can provide any other information. - Gavin -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
