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Victor Galis

2009-Apr-08 00:55 UTC

[zfs-discuss] ZFS data loss

Hi,

I have lost a ZFS volume and I am hoping to get some help to recover the 
information ( a couple of months worth of work :( ).

I have been using ZFS for more than 6 months on this project. Yesterday 
I ran a "zvol status" command, the system froze and rebooted. When it 
came back the discs where not available.

See bellow the output of  " zpool status", "format" and
"zdb".

Do you think there is something that can be done to recover lost data?

 Thanks,
   Vic


v490vic-00f3 # zpool status
  pool: SAP
 state: UNAVAIL
status: One or more devices could not be opened.  There are insufficient
        replicas for the pool to continue functioning.
action: Attach the missing device and online it using ''zpool
online''.
   see: http://www.sun.com/msg/ZFS-8000-D3
 scrub: none requested
config:

        NAME                       STATE     READ WRITE CKSUM
        SAP                        UNAVAIL      0     0     0  
insufficient replicas
          mirror                   UNAVAIL      0     0     0  corrupted 
data
            c6t40d0                ONLINE       0     0     0 cannot open
            c6t226000C0FFA05F5Ed0  UNAVAIL      0     0     0  cannot open
          mirror                   UNAVAIL      0     0     0  
insufficient replicas
            c6t216000C0FF805F5Ed0  UNAVAIL      0     0     0  cannot open
            c6t42d0                UNAVAIL      0     0     0  cannot open
v490vic-00f3 # format
Searching for disks...done

c6t42d0: configured with capacity of 272.44GB
c6t118d0: configured with capacity of 679.97GB
c6t118d31: configured with capacity of 16.00MB
c6t119d0: configured with capacity of 679.97GB
c6t119d31: configured with capacity of 16.00MB
c6t216000C0FF87A646d0: configured with capacity of 272.44GB
c6t216000C0FF805F5Ed0: configured with capacity of 272.44GB
c6t226000C0FFA05F5Ed0: configured with capacity of 272.44GB


AVAILABLE DISK SELECTIONS:
       0. c1t0d0 <SUN72G cyl 14087 alt 2 hd 24 sec 424>
          /pci at 9,600000/SUNW,qlc at 2/fp at 0,0/ssd at w2100000c503b5b09,0
       1. c1t1d0 <SUN72G cyl 14087 alt 2 hd 24 sec 424>
          /pci at 9,600000/SUNW,qlc at 2/fp at 0,0/ssd at w2100000c503b783f,0
       2. c6t40d0 <SUN-StorEdge3510-327P cyl 35424 alt 2 hd 127 sec 127>
          /pci at 8,600000/SUNW,qlc at 2/fp at 0,0/ssd at w216000c0ff87a7a9,0
       3. c6t42d0 <SUN-StorEdge3510-327P cyl 35424 alt 2 hd 127 sec 127>
          /pci at 8,600000/SUNW,qlc at 2/fp at 0,0/ssd at w226000c0ffa7a7a9,0
       4. c6t118d0 <SUN-LCSM100_F-0670 cyl 65533 alt 2 hd 128 sec 170>
          /pci at 8,600000/SUNW,qlc at 2/fp at 0,0/ssd at w202500a0b85a4cc8,0
       5. c6t118d31 <SUN-UniversalXport-0670 cyl 8 alt 2 hd 64 sec 64>
          /pci at 8,600000/SUNW,qlc at 2/fp at 0,0/ssd at w202500a0b85a4cc8,1f
       6. c6t119d0 <SUN-LCSM100_F-0670 cyl 65533 alt 2 hd 128 sec 170>
          /pci at 8,600000/SUNW,qlc at 2/fp at 0,0/ssd at w202400a0b85a4cc8,0
       7. c6t119d31 <SUN-UniversalXport-0670 cyl 8 alt 2 hd 64 sec 64>
          /pci at 8,600000/SUNW,qlc at 2/fp at 0,0/ssd at w202400a0b85a4cc8,1f
       8. c6t216000C0FF87A646d0 <SUN-StorEdge3510-327P cyl 35424 alt 2 
hd 127 sec 127>
          /pci at 8,600000/SUNW,qlc at 2/fp at 0,0/ssd at w216000c0ff87a646,0
       9. c6t216000C0FF805F5Ed0 <SUN-StorEdge3510-327P cyl 35424 alt 2 
hd 127 sec 127>
          /pci at 8,600000/SUNW,qlc at 2/fp at 0,0/ssd at w216000c0ff805f5e,0
      10. c6t226000C0FFA05F5Ed0 <SUN-StorEdge3510-327P cyl 35424 alt 2 
hd 127 sec 127>
          /pci at 8,600000/SUNW,qlc at 2/fp at 0,0/ssd at w226000c0ffa05f5e,0
      11. c6t226000C0FFA7A646d0 <SUN-StorEdge3510-327P cyl 35424 alt 2 
hd 127 sec 127>

v490vic-00f3 # zdb
SAP
    version=4
    name=''SAP''
    state=0
    txg=2589278
    pool_guid=5644167510038135831
    vdev_tree
        type=''root''
        id=0
        guid=5644167510038135831
        children[0]
                type=''mirror''
                id=0
                guid=14615540212911926254
                whole_disk=0
                metaslab_array=17
                metaslab_shift=31
                ashift=9
                asize=292543528960
                children[0]
                        type=''disk''
                        id=0
                        guid=3588260184558145093
                       
path=''/dev/dsk/c6t216000C0FF87A7A9d0s0''
                        devid=''id1,ssd at
n600c0ff00000000007a7a96be8e22900/a''
                        whole_disk=1
                        DTL=197
                children[1]
                        type=''disk''
                        id=1
                        guid=4026862278207380809
                       
path=''/dev/dsk/c6t226000C0FFA05F5Ed0s0''
                        devid=''id1,ssd at
n600c0ff000000000005f5e76605a4900/a''
                        whole_disk=1
                        DTL=196
        children[1]
                type=''mirror''
                id=1
                guid=13122299688569793580
                whole_disk=0
                metaslab_array=14
                metaslab_shift=31
                ashift=9
                asize=292543528960
                children[0]
                        type=''disk''
                        id=0
                        guid=16666343811411216678
                       
path=''/dev/dsk/c6t216000C0FF805F5Ed0s0''
                        devid=''id1,ssd at
n600c0ff000000000005f5e137feb5500/a''
                        whole_disk=1
                        DTL=198
                children[1]
                        type=''disk''
                        id=1
                        guid=7841227132682983069
                       
path=''/dev/dsk/c6t226000C0FFA7A7A9d0s0''
                        devid=''id1,ssd at
n600c0ff00000000007a7a94f7554fe00/a''
                        whole_disk=1
                        DTL=199

-- 

Victor Galis
Sun Solution Center for SAP
Office: x82399, 650-786-2399

Tomas Ögren

2009-Apr-08 09:06 UTC

head link

[zfs-discuss] ZFS data loss

On 07 April, 2009 - Victor Galis sent me these 5,8K bytes:
> Hi,
>
> I have lost a ZFS volume and I am hoping to get some help to recover the  
> information ( a couple of months worth of work :( ).
>
> I have been using ZFS for more than 6 months on this project. Yesterday  
> I ran a "zvol status" command, the system froze and rebooted.
When it
> came back the discs where not available.
>
> See bellow the output of  " zpool status", "format" and
"zdb".
>
> Do you think there is something that can be done to recover lost data?
>
> Thanks,
>   Vic
Does ''zpool import'' find anything? devfsadm -v  to re-scan
devices
first perhaps..

/Tomas
-- 
Tomas ?gren, stric at acc.umu.se, http://www.acc.umu.se/~stric/
|- Student at Computing Science, University of Ume?
`- Sysadmin at {cs,acc}.umu.se

Fajar A. Nugraha

2009-Apr-08 09:19 UTC

head link

[zfs-discuss] ZFS data loss

On Wed, Apr 8, 2009 at 4:06 PM, Tomas ?gren <stric at acc.umu.se>
wrote:>> Do you think there is something that can be done to recover lost data?
>>
>> Thanks,
>> ? Vic
>
> Does ''zpool import'' find anything? devfsadm -v ?to
re-scan devices
> first perhaps..
... or info from the other thread

"boot from disk into single user mode and move the
/etc/zfs/zpool.cache file to a different name.   Finish the boot into
multi user and issue the "zpool import""

Perhaps for some reason your disk number changed, or some of the disks
were undetected when zfs starts, so zfs got confused? Worth to try.

Regards,

Fajar

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