[zfs-discuss] Boot time VERY slow

Will Rouesnel w.rouesnel at gmail.com
Sun May 6 02:34:19 EDT 2012


It's not just zvol snapshots. I found I couldn't mount a volume which 
had a tens of thousands of snapshots in any reasonable amount of time 
until I'd removed a lot of them. It would stall mount time at boot (for 
hours - I never found out how long exactly) and take 15-45 minutes if I 
booted into recovery mode and loaded ZFS manually.

The problem is something to do with whatever ZoL does when you modprobe 
zfs, but it's not really a lock up - I can use the system on another 
virtual terminal quite happily.

Also: if you're using zfs-auto-snapshot, there's a fairly good chance 
you have thousands of snapshots anyway - in the current daily ppa zfs 
destroy -r doesn't work for snapshots for some reason.

On 5/05/2012 11:55 AM, Richard Yao wrote:
> If I had to guess, I would say that you are running into a known issue
> where you have too many snapshots making devices in /dev. It seems that
> Linux does not boot quickly with more than a few thousand devices.
>
> On 05/04/12 21:35, ChessDoter wrote:
>> Running ZoL on Ubuntu/Oneiric and starting off an SSD, i used to see
>> short boot times with ZFS automounting through the defaults/zfs file.
>>
>> Now ZFS improved, but i have to wait about 10 times as long since
>> mountall took care of the initialisation. At least i can see, that there
>> is a lot of disk activity while i have to wait, so i assumed that the
>> (newly set up) RAID might be the cause.
>>
>> Also zfs-auto-snapshot might be involved, as it kicks in at boot time.
>> While i understand, that performance optimisation isnt the focal point
>> of development yet. But since boot time feels like increasing each time,
>> i had a glance at syslog. What i see there doesnt mean much to me,
>> although it looks strange to me... (snippet follows:)
>>
>> Could someone hint me towards recommended action(s) (oops, return-code
>> 1, sendmail failure,...)?
>>
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205903] Call Trace:
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205917]
>> [<ffffffffa0203b26>] zpl_kill_sb+0x16/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205919]
>> [<ffffffff8116ae5c>] deactivate_locked_super+0x3c/0x90
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205921]
>> [<ffffffff8116b363>] mount_nodev+0xb3/0xc0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205934]
>> [<ffffffffa0203b65>] zpl_mount+0x25/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205936]
>> [<ffffffff8116be33>] mount_fs+0x43/0x1b0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205938]
>> [<ffffffff8118688a>] vfs_kern_mount+0x6a/0xc0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205940]
>> [<ffffffff81187d04>] do_kern_mount+0x54/0x110
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205942]
>> [<ffffffff811897a4>] do_mount+0x1a4/0x260
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205943]
>> [<ffffffff81189c40>] sys_mount+0x90/0xe0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205945]
>> [<ffffffff815fc642>] system_call_fastpath+0x16/0x1b
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205946] Code: 05 00 00 48
>> c7 c6 5b ff 20 a0 48 c7 c7 10 0b 22 a0 e8 55 40 ed ff e9 c0 fe ff ff 55
>> 48 89 e5 66 66 66 66 90 48 8b bf 88 02 00 00
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205963] RIP
>> [<ffffffffa01e7720>] zfs_preumount+0x10/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205976]  RSP
>> <ffff880049311d38>
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205977] CR2: 0000000000000400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.205978] ---[ end trace
>> 6909a8c34db4c4b3 ]---
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208040] BUG: unable to
>> handle kernel NULL pointer dereference at 0000000000000400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208043] IP:
>> [<ffffffffa01e7720>] zfs_preumount+0x10/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208058] PGD 4910f067 PUD
>> 49070067 PMD 0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208060] Oops: 0000 [#51772]
>> SMP
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208061] CPU 4
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208062] Modules linked in:
>> bnep rfcomm bluetooth pci_stub vboxpci vboxnetadp vboxnetflt vboxdrv
>> nfsd lockd nfs_acl auth_rpcgss sunrpc parport_pc ppdev binfmt_misc
>> vesafb snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel
>> snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi
>> snd_seq_midi_event snd_seq snd_timer snd_seq_device fglrx(P) mei(C)
>> psmouse serio_raw snd soundcore snd_page_alloc lp parport zfs(P)
>> zcommon(P) znvpair(P) zavl(P) zunicode(P) spl zlib_deflate usbhid hid
>> firewire_ohci firewire_core ahci libahci crc_itu_t xhci_hcd e1000e
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208080]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208081] Pid: 30266, comm:
>> mount.zfs Tainted: P      D  C  3.0.0-19-generic #33-Ubuntu      /DP67DE
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208084] RIP:
>> 0010:[<ffffffffa01e7720>]  [<ffffffffa01e7720>] zfs_preumount+0x10/0x30
>> [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208098] RSP:
>> 0018:ffff880048e1dd38  EFLAGS: 00010296
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208099] RAX:
>> 0000000000000000 RBX: ffff880049dd5400 RCX: 00000000002cbf05
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208100] RDX:
>> 00000000002cbf04 RSI: 00000000000158a0 RDI: 0000000000000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208101] RBP:
>> ffff880048e1dd38 R08: ffffea000ab69940 R09: ffffffffa00be9eb
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208103] R10:
>> ffff880048cb9800 R11: 0000000000000002 R12: ffffffffa022d4c0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208104] R13:
>> ffffffffa0203b70 R14: ffff880048e1ddb8 R15: 0000000002000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208105] FS:
>> 00007f7777368c20(0000) GS:ffff88041f500000(0000) knlGS:0000000000000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208107] CS:  0010 DS: 0000
>> ES: 0000 CR0: 0000000080050033
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208108] CR2:
>> 0000000000000400 CR3: 0000000049238000 CR4: 00000000000426e0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208109] DR0:
>> 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208110] DR3:
>> 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208111] Process mount.zfs
>> (pid: 30266, threadinfo ffff880048e1c000, task ffff880275574560)
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208113] Stack:
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208113]  ffff880048e1dd58
>> ffffffffa0203b26 ffff88041f7c4d30 ffff880049dd5400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208115]  ffff880048e1dd78
>> ffffffff8116ae5c fffffffffffffff0 00000000fffffff0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208117]  ffff880048e1dda8
>> ffffffff8116b363 ffff880389f42900 ffffffffa022d4c0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208119] Call Trace:
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208133]
>> [<ffffffffa0203b26>] zpl_kill_sb+0x16/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208135]
>> [<ffffffff8116ae5c>] deactivate_locked_super+0x3c/0x90
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208137]
>> [<ffffffff8116b363>] mount_nodev+0xb3/0xc0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208150]
>> [<ffffffffa0203b65>] zpl_mount+0x25/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208151]
>> [<ffffffff8116be33>] mount_fs+0x43/0x1b0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208153]
>> [<ffffffff8118688a>] vfs_kern_mount+0x6a/0xc0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208155]
>> [<ffffffff81187d04>] do_kern_mount+0x54/0x110
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208157]
>> [<ffffffff811897a4>] do_mount+0x1a4/0x260
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208159]
>> [<ffffffff81189c40>] sys_mount+0x90/0xe0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208161]
>> [<ffffffff815fc642>] system_call_fastpath+0x16/0x1b
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208162] Code: 05 00 00 48
>> c7 c6 5b ff 20 a0 48 c7 c7 10 0b 22 a0 e8 55 40 ed ff e9 c0 fe ff ff 55
>> 48 89 e5 66 66 66 66 90 48 8b bf 88 02 00 00
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208178] RIP
>> [<ffffffffa01e7720>] zfs_preumount+0x10/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208191]  RSP
>> <ffff880048e1dd38>
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208191] CR2: 0000000000000400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208193] ---[ end trace
>> 6909a8c34db4c4b4 ]---
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208194] BUG: unable to
>> handle kernel NULL pointer dereference at 0000000000000400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208196] IP:
>> [<ffffffffa01e7720>] zfs_preumount+0x10/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208212] PGD 48df9067 PUD
>> 48dfc067 PMD 0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208214] Oops: 0000 [#51773]
>> SMP
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208216] CPU 7
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208216] Modules linked in:
>> bnep rfcomm bluetooth pci_stub vboxpci vboxnetadp vboxnetflt vboxdrv
>> nfsd lockd nfs_acl auth_rpcgss sunrpc parport_pc ppdev binfmt_misc
>> vesafb snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel
>> snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi
>> snd_seq_midi_event snd_seq snd_timer snd_seq_device fglrx(P) mei(C)
>> psmouse serio_raw snd soundcore snd_page_alloc lp parport zfs(P)
>> zcommon(P) znvpair(P) zavl(P) zunicode(P) spl zlib_deflate usbhid hid
>> firewire_ohci firewire_core ahci libahci crc_itu_t xhci_hcd e1000e
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208235]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208236] Pid: 30219, comm:
>> mount.zfs Tainted: P      D  C  3.0.0-19-generic #33-Ubuntu      /DP67DE
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208238] RIP:
>> 0010:[<ffffffffa01e7720>]  [<ffffffffa01e7720>] zfs_preumount+0x10/0x30
>> [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208253] RSP:
>> 0018:ffff880048cafd38  EFLAGS: 00010296
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208254] RAX:
>> 0000000000000000 RBX: ffff8800540f3000 RCX: 0000000000296a8e
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208256] RDX:
>> 0000000000296a8d RSI: 00000000000158a0 RDI: 0000000000000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208257] RBP:
>> ffff880048cafd38 R08: ffffea00014e1b40 R09: ffffffffa00be9eb
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208258] R10:
>> ffff880048cb9800 R11: 0000000000000002 R12: ffffffffa022d4c0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208259] R13:
>> ffffffffa0203b70 R14: ffff880048cafdb8 R15: 0000000002000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208261] FS:
>> 00007f4f98911c20(0000) GS:ffff88041f5c0000(0000) knlGS:0000000000000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208262] CS:  0010 DS: 0000
>> ES: 0000 CR0: 0000000080050033
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208263] CR2:
>> 0000000000000400 CR3: 0000000048dff000 CR4: 00000000000426e0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208264] DR0:
>> 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208266] DR3:
>> 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208267] Process mount.zfs
>> (pid: 30219, threadinfo ffff880048cae000, task ffff880274400000)
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208268] Stack:
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208269]  ffff880048cafd58
>> ffffffffa0203b26 ffff88041f7c4d30 ffff8800540f3000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208271]  ffff880048cafd78
>> ffffffff8116ae5c fffffffffffffff0 00000000fffffff0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208273]  ffff880048cafda8
>> ffffffff8116b363 ffff88038c906100 ffffffffa022d4c0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208275] Call Trace:
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208289]
>> [<ffffffffa0203b26>] zpl_kill_sb+0x16/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208291]
>> [<ffffffff8116ae5c>] deactivate_locked_super+0x3c/0x90
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208293]
>> [<ffffffff8116b363>] mount_nodev+0xb3/0xc0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208306]
>> [<ffffffffa0203b65>] zpl_mount+0x25/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208308]
>> [<ffffffff8116be33>] mount_fs+0x43/0x1b0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208310]
>> [<ffffffff8118688a>] vfs_kern_mount+0x6a/0xc0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208312]
>> [<ffffffff81187d04>] do_kern_mount+0x54/0x110
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208314]
>> [<ffffffff811897a4>] do_mount+0x1a4/0x260
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208316]
>> [<ffffffff81189c40>] sys_mount+0x90/0xe0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208318]
>> [<ffffffff815fc642>] system_call_fastpath+0x16/0x1b
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208319] Code: 05 00 00 48
>> c7 c6 5b ff 20 a0 48 c7 c7 10 0b 22 a0 e8 55 40 ed ff e9 c0 fe ff ff 55
>> 48 89 e5 66 66 66 66 90 48 8b bf 88 02 00 00
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208335] RIP
>> [<ffffffffa01e7720>] zfs_preumount+0x10/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208348]  RSP
>> <ffff880048cafd38>
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208349] CR2: 0000000000000400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.208351] ---[ end trace
>> 6909a8c34db4c4b5 ]---
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210357] BUG: unable to
>> handle kernel NULL pointer dereference at 0000000000000400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210359] IP:
>> [<ffffffffa01e7720>] zfs_preumount+0x10/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210376] PGD 4934b067 PUD
>> 4934a067 PMD 0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210378] Oops: 0000 [#51774]
>> SMP
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210379] CPU 1
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210380] Modules linked in:
>> bnep rfcomm bluetooth pci_stub vboxpci vboxnetadp vboxnetflt vboxdrv
>> nfsd lockd nfs_acl auth_rpcgss sunrpc parport_pc ppdev binfmt_misc
>> vesafb snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel
>> snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_rawmidi
>> snd_seq_midi_event snd_seq snd_timer snd_seq_device fglrx(P) mei(C)
>> psmouse serio_raw snd soundcore snd_page_alloc lp parport zfs(P)
>> zcommon(P) znvpair(P) zavl(P) zunicode(P) spl zlib_deflate usbhid hid
>> firewire_ohci firewire_core ahci libahci crc_itu_t xhci_hcd e1000e
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210398]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210400] Pid: 30242, comm:
>> mount.zfs Tainted: P      D  C  3.0.0-19-generic #33-Ubuntu      /DP67DE
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210402] RIP:
>> 0010:[<ffffffffa01e7720>]  [<ffffffffa01e7720>] zfs_preumount+0x10/0x30
>> [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210416] RSP:
>> 0018:ffff880048e61d38  EFLAGS: 00010296
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210417] RAX:
>> 0000000000000000 RBX: ffff88009f305400 RCX: 00000000002d8522
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210419] RDX:
>> 00000000002d8521 RSI: 00000000000158a0 RDI: 0000000000000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210420] RBP:
>> ffff880048e61d38 R08: ffffea000a4a1080 R09: ffffffffa00be9eb
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210421] R10:
>> ffff880048cb9800 R11: 0000000000000002 R12: ffffffffa022d4c0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210422] R13:
>> ffffffffa0203b70 R14: ffff880048e61db8 R15: 0000000002000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210424] FS:
>> 00007f1e433d9c20(0000) GS:ffff88041f440000(0000) knlGS:0000000000000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210425] CS:  0010 DS: 0000
>> ES: 0000 CR0: 0000000080050033
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210426] CR2:
>> 0000000000000400 CR3: 0000000049348000 CR4: 00000000000426e0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210427] DR0:
>> 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210429] DR3:
>> 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210430] Process mount.zfs
>> (pid: 30242, threadinfo ffff880048e60000, task ffff880274404560)
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210431] Stack:
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210432]  ffff880048e61d58
>> ffffffffa0203b26 ffff88041f7c4d30 ffff88009f305400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210434]  ffff880048e61d78
>> ffffffff8116ae5c fffffffffffffff0 00000000fffffff0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210436]  ffff880048e61da8
>> ffffffff8116b363 ffff880142152a00 ffffffffa022d4c0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210438] Call Trace:
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210451]
>> [<ffffffffa0203b26>] zpl_kill_sb+0x16/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210454]
>> [<ffffffff8116ae5c>] deactivate_locked_super+0x3c/0x90
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210455]
>> [<ffffffff8116b363>] mount_nodev+0xb3/0xc0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210468]
>> [<ffffffffa0203b65>] zpl_mount+0x25/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210470]
>> [<ffffffff8116be33>] mount_fs+0x43/0x1b0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210472]
>> [<ffffffff8118688a>] vfs_kern_mount+0x6a/0xc0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210474]
>> [<ffffffff81187d04>] do_kern_mount+0x54/0x110
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210476]
>> [<ffffffff811897a4>] do_mount+0x1a4/0x260
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210478]
>> [<ffffffff81189c40>] sys_mount+0x90/0xe0
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210480]
>> [<ffffffff815fc642>] system_call_fastpath+0x16/0x1b
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210481] Code: 05 00 00 48
>> c7 c6 5b ff 20 a0 48 c7 c7 10 0b 22 a0 e8 55 40 ed ff e9 c0 fe ff ff 55
>> 48 89 e5 66 66 66 66 90 48 8b bf 88 02 00 00
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210497] RIP
>> [<ffffffffa01e7720>] zfs_preumount+0x10/0x30 [zfs]
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210520]  RSP
>> <ffff880048e61d38>
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210521] CR2: 0000000000000400
>> May  5 02:59:17 multi-os-host kernel: [ 1962.210527] ---[ end trace
>> 6909a8c34db4c4b6 ]---
>> May  5 03:00:01 multi-os-host CRON[30342]: (root) CMD (zfs-auto-snapshot
>> -q -g --label=frequent --keep=4  -r RAID)
>> May  5 03:00:15 multi-os-host kernel: [ 2020.366215] ata6: exception
>> Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen
>> May  5 03:00:15 multi-os-host kernel: [ 2020.366220] ata6: irq_stat
>> 0x00000040, connection status changed
>> May  5 03:00:15 multi-os-host kernel: [ 2020.366224] ata6: SError: {
>> DevExch }
>> May  5 03:00:15 multi-os-host kernel: [ 2020.366231] ata6: hard
>> resetting link
>> May  5 03:00:21 multi-os-host kernel: [ 2026.111791] ata6: link is slow
>> to respond, please be patient (ready=0)
>> May  5 03:00:26 multi-os-host kernel: [ 2030.355659] ata6: COMRESET
>> failed (errno=-16)
>> May  5 03:00:26 multi-os-host kernel: [ 2030.355667] ata6: hard
>> resetting link
>> May  5 03:00:27 multi-os-host kernel: [ 2031.636006] ata6: SATA link up
>> 3.0 Gbps (SStatus 123 SControl 300)
>> May  5 03:00:27 multi-os-host kernel: [ 2031.686288] ata6.00: ATA-8:
>> ST31000333AS, SD35, max UDMA/133
>> May  5 03:00:27 multi-os-host kernel: [ 2031.686294] ata6.00: 1953525168
>> sectors, multi 0: LBA48 NCQ (depth 31/32)
>> May  5 03:00:27 multi-os-host kernel: [ 2031.728100] ata6.00: configured
>> for UDMA/133
>> May  5 03:00:27 multi-os-host kernel: [ 2031.751656] ata6: EH complete
>> May  5 03:00:27 multi-os-host kernel: [ 2031.751792] scsi 5:0:0:0:
>> Direct-Access     ATA      ST31000333AS     SD35 PQ: 0 ANSI: 5
>> May  5 03:00:27 multi-os-host kernel: [ 2031.751964] sd 5:0:0:0: [sde]
>> 1953525168 512-byte logical blocks: (1.00 TB/931 GiB)
>> May  5 03:00:27 multi-os-host kernel: [ 2031.752026] sd 5:0:0:0:
>> Attached scsi generic sg5 type 0
>> May  5 03:00:27 multi-os-host kernel: [ 2031.752045] sd 5:0:0:0: [sde]
>> Write Protect is off
>> May  5 03:00:27 multi-os-host kernel: [ 2031.752050] sd 5:0:0:0: [sde]
>> Mode Sense: 00 3a 00 00
>> May  5 03:00:27 multi-os-host kernel: [ 2031.752087] sd 5:0:0:0: [sde]
>> Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>> May  5 03:00:27 multi-os-host kernel: [ 2031.823518]  sde: sde1 sde9
>> May  5 03:00:27 multi-os-host kernel: [ 2031.823831] sd 5:0:0:0: [sde]
>> Attached SCSI disk
>> May  5 03:01:02 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_frequent-2012-05-05-0145' returned 1
>> May  5 03:01:02 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_frequent-2012-05-05-0130' returned 1
>> May  5 03:01:02 multi-os-host zfs-auto-snap:
>> @zfs-auto-snap_frequent-2012-05-05-0301, 1 created, 0 destroyed, 2
>> warnings.
>> May  5 03:01:02 multi-os-host postfix/sendmail[30490]: fatal: open
>> /etc/postfix/main.cf: No such file or directory
>> May  5 03:01:02 multi-os-host CRON[30341]: (root) MAIL (mailed 1 byte of
>> output; but got status 0x004b, #012)
>> May  5 03:15:01 multi-os-host CRON[30620]: (root) CMD (zfs-auto-snapshot
>> -q -g --label=frequent --keep=4  -r RAID)
>> May  5 03:15:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_frequent-2012-05-05-0200' returned 1
>> May  5 03:15:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_frequent-2012-05-05-0145' returned 1
>> May  5 03:15:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_frequent-2012-05-05-0130' returned 1
>> May  5 03:15:04 multi-os-host zfs-auto-snap:
>> @zfs-auto-snap_frequent-2012-05-05-0315, 1 created, 0 destroyed, 3
>> warnings.
>> May  5 03:15:04 multi-os-host postfix/sendmail[30656]: fatal: open
>> /etc/postfix/main.cf: No such file or directory
>> May  5 03:15:04 multi-os-host CRON[30619]: (root) MAIL (mailed 1 byte of
>> output; but got status 0x004b, #012)
>> May  5 03:17:01 multi-os-host CRON[30663]: (root) CMD (   cd /&&
>> run-parts --report /etc/cron.hourly)
>> May  5 03:17:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-04-0217' returned 1
>> May  5 03:17:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-04-0117' returned 1
>> May  5 03:17:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-04-0017' returned 1
>> May  5 03:17:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-2317' returned 1
>> May  5 03:17:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-2217' returned 1
>> May  5 03:17:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-2117' returned 1
>> May  5 03:17:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-2017' returned 1
>> May  5 03:17:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-1917' returned 1
>> May  5 03:17:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-1817' returned 1
>> May  5 03:17:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-1717' returned 1
>> May  5 03:17:05 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-1617' returned 1
>> May  5 03:17:05 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-1517' returned 1
>> May  5 03:17:05 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-1417' returned 1
>> May  5 03:17:05 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-1317' returned 1
>> May  5 03:17:05 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-1217' returned 1
>> May  5 03:17:05 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_hourly-2012-05-03-1117' returned 1
>> May  5 03:17:05 multi-os-host zfs-auto-snap:
>> @zfs-auto-snap_hourly-2012-05-05-0317, 1 created, 0 destroyed, 16 warnings.
>> May  5 03:17:05 multi-os-host postfix/sendmail[30741]: fatal: open
>> /etc/postfix/main.cf: No such file or directory
>> May  5 03:17:05 multi-os-host CRON[30662]: (root) MAIL (mailed 1 byte of
>> output; but got status 0x004b, #012)
>> May  5 03:30:01 multi-os-host CRON[30753]: (root) CMD (zfs-auto-snapshot
>> -q -g --label=frequent --keep=4  -r RAID)
>> May  5 03:30:03 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_frequent-2012-05-05-0230' returned 1
>> May  5 03:30:03 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_frequent-2012-05-05-0200' returned 1
>> May  5 03:30:03 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_frequent-2012-05-05-0145' returned 1
>> May  5 03:30:04 multi-os-host zfs-auto-snap: zfs destroy -r
>> 'RAID at zfs-auto-snap_frequent-2012-05-05-0130' returned 1
>> May  5 03:30:04 multi-os-host zfs-auto-snap:
>> @zfs-auto-snap_frequent-2012-05-05-0330, 1 created, 0 destroyed, 4
>> warnings.
>> May  5 03:30:04 multi-os-host postfix/sendmail[30792]: fatal: open
>> /etc/postfix/main.cf: No such file or directory
>> May  5 03:30:04 multi-os-host CRON[30752]: (root) MAIL (mailed 1 byte of
>> output; but got status 0x004b, #012)
>>
>> Thank you
>



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