So I've had this raid configuration set up and running for many many months if not years: /dev/md1:         Version : 1.2   Creation Time : Sat Dec 26 19:49:41 2015      Raid Level : raid0      Array Size : 1953524736 (1863.03 GiB 2000.41 GB)    Raid Devices : 2   Total Devices : 2     Persistence : Superblock is persistent     Update Time : Sat Dec 26 19:49:41 2015           State : clean  Active Devices : 2 Working Devices : 2  Failed Devices : 0   Spare Devices : 0      Chunk Size : 512K            Name : linux.interlinx.bc.ca:1  (local to host linux.interlinx.bc.ca)            UUID : f27ae74d:e2997e50:9df158ee:c5ed3cbb          Events : 0     Number   Major   Minor   RaidDevice State        0       8       16        0      active sync   /dev/sdb        1       8       32        1      active sync   /dev/sdc /dev/md0:         Version : 0.90   Creation Time : Mon Jan 26 19:51:38 2009      Raid Level : raid1      Array Size : 1953514496 (1863.02 GiB 2000.40 GB)   Used Dev Size : 1953514496 (1863.02 GiB 2000.40 GB)    Raid Devices : 2   Total Devices : 2 Preferred Minor : 0     Persistence : Superblock is persistent     Update Time : Fri Apr  8 00:00:42 2016           State : active, degraded  Active Devices : 1 Working Devices : 1  Failed Devices : 1   Spare Devices : 0            UUID : 2f8fc5e0:a0eb646a:2303d005:33f25f21          Events : 0.5031387     Number   Major   Minor   RaidDevice State        0       8       48        0      active sync   /dev/sdd        1       0        0        1      removed        2       9        1        -      faulty spare   /dev/md1 Now out of the blue (or seemingly out of the blue, nothing really comes out of the blue) I am starting to get the md0 array faulting with: [37722.335880] md/raid0:md1: make_request bug: can't convert block across chunks or bigger than 512k 2554601336 124 [37722.335887] md/raid1:md0: md1: rescheduling sector 2554601336 [37722.376776] md/raid1:md0: redirecting sector 2554601336 to other mirror: md1 [37722.386455] md/raid0:md1: make_request bug: can't convert block across chunks or bigger than 512k 2554601336 124 [37722.386461] md/raid1:md0: md1: rescheduling sector 2554601336 [37722.412059] md/raid1:md0: redirecting sector 2554601336 to other mirror: sdd [37722.735049] md/raid0:md1: make_request bug: can't convert block across chunks or bigger than 512k 2554608496 124 [37722.735056] md/raid1:md0: md1: rescheduling sector 2554608496 [37722.789926] md/raid1:md0: redirecting sector 2554608496 to other mirror: md1 [37722.798689] md/raid0:md1: make_request bug: can't convert block across chunks or bigger than 512k 2554608496 124 [37722.798696] md/raid1:md0: md1: rescheduling sector 2554608496 [37722.859314] md/raid1:md0: redirecting sector 2554608496 to other mirror: sdd [37724.819090] md/raid0:md1: make_request bug: can't convert block across chunks or bigger than 512k 2554606584 12 [37724.819096] md/raid1:md0: md1: rescheduling sector 2554606584 [37727.455279] md/raid1:md0: redirecting sector 2554606584 to other mirror: sdd [37752.406865] md/raid0:md1: make_request bug: can't convert block across chunks or bigger than 512k 1748150224 124 [37752.521219] md/raid1:md0: Disk failure on md1, disabling device. [37752.521222] md/raid1:md0: Operation continuing on 1 devices. [37752.580186] RAID1 conf printout: [37752.580190]  --- wd:1 rd:2 [37752.580194]  disk 0, wo:0, o:1, dev:sdd [37752.580197]  disk 1, wo:1, o:0, dev:md1 [37752.580199] RAID1 conf printout: [37752.580201]  --- wd:1 rd:2 [37752.580203]  disk 0, wo:0, o:1, dev:sdd [37752.580228] BUG: unable to handle kernel paging request at 000000001dff2107 [37752.584011] IP: [] close_write+0x6a/0xa0 [raid1] [37752.584011] PGD 20f667067 PUD 20f669067 PMD 0  [37752.584011] Oops: 0000 [#1] SMP  [37752.584011] CPU 0  [37752.584011] Modules linked in: iptable_mangle iptable_filter ipt_MASQUERADE xt_tcpudp iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables autofs4 nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm radeon snd_seq_midi ttm drm_kms_helper snd_rawmidi ftdi_sio snd_seq_midi_event snd_seq snd_timer drm ppdev snd_seq_device pl2303 usbserial serio_raw i2c_algo_bit mac_hid asus_atk0110 snd parport_pc parport soundcore snd_page_alloc edac_core edac_mce_amd i2c_piix4 k8temp shpchp 8021q garp stp pata_atiixp r8169 raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx raid1 raid0 multipath linear [37752.584011]  [37752.584011] Pid: 267, comm: md0_raid1 Not tainted 3.2.0-101-generic #141-Ubuntu System manufacturer System Product Name/M2A-VM [37752.584011] RIP: 0010:[]  [] close_write+0x6a/0xa0 [raid1] [37752.584011] RSP: 0018:ffff88020def9dc0  EFLAGS: 00010246 [37752.584011] RAX: 000000001dff1dff RBX: ffff88020e380108 RCX: 00000000e8e08784 [37752.584011] RDX: 00000000687249a8 RSI: 0000000000000002 RDI: ffff88020e380108 [37752.584011] RBP: ffff88020def9dd0 R08: 00000000e8e08784 R09: 000000000000036b [37752.584011] R10: dead000000100100 R11: dead000000200200 R12: ffff88020e36b800 [37752.584011] R13: ffff88020e380100 R14: ffff88020e380130 R15: ffff88020e380108 [37752.584011] FS:  00007f8e0a353740(0000) GS:ffff88021fc00000(0000) knlGS:00000000f75586c0 [37752.584011] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b [37752.584011] CR2: 000000001dff2107 CR3: 000000020f61e000 CR4: 00000000000006f0 [37752.584011] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [37752.584011] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [37752.584011] Process md0_raid1 (pid: 267, threadinfo ffff88020def8000, task ffff88020e2eae00) [37752.584011] Stack: [37752.584011]  ffff88020def9e20 ffff88020e36b800 ffff88020def9e60 ffffffffa001cbe5 [37752.584011]  ffff88020e380140 ffff880044dbd800 0000000091827364 ffff88020def9df8 [37752.584011]  ffff88020def9df8 ffff88020def9e08 ffff88020def9e08 ffff880200000000 [37752.584011] Call Trace: [37752.584011]  [] raid1d+0x2a5/0x2b0 [raid1] [37752.584011]  [] md_thread+0x11e/0x170 [37752.584011]  [] ? add_wait_queue+0x60/0x60 [37752.584011]  [] ? md_rdev_init+0x130/0x130 [37752.584011]  [] kthread+0x8c/0xa0 [37752.584011]  [] kernel_thread_helper+0x4/0x10 [37752.584011]  [] ? flush_kthread_worker+0xa0/0xa0 [37752.584011]  [] ? gs_change+0x13/0x13 [37752.584011] Code: e4 48 8b 53 48 75 de 48 89 d7 e8 e2 cd 14 e1 48 c7 43 48 00 00 00 00 4c 8b 43 18 48 8b 43 20 48 8b 4b 18 48 63 53 10 48 8b 73 08 <48> 8b b8 08 03 00 00 49 c1 e8 03 48 c1 e9 02 41 83 e0 01 83 e1  [37752.584011] RIP  [] close_write+0x6a/0xa0 [raid1] [37752.584011]  RSP [37752.584011] CR2: 000000001dff2107 [37752.889674] ---[ end trace 276f024e11aa62ac ]--- Any ideas what is all of a sudden happening? Cheers, b.