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Mount ReadyNAS NV+ RAID disks in Linux - Input/Output error

rexpo
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‎2011-11-03 04:28 AM
‎2011-11-03 04:28 AM

Mount ReadyNAS NV+ RAID disks in Linux - Input/Output error

Hi all,

I know this topic has been covered many times in these forums and other places on the net, but I am still having trouble accessing the actual files on the NAS disks. I have come frustratingly close to being access the files, but not close enough! I'd like to know why my directory listing of the mounted raid looks like this?:

root@ubuntu:/mnt# ls -lasc
ls: cannot access backup: Input/output error
ls: cannot access media: Input/output error
ls: cannot access home: Input/output error
ls: cannot access .timemachine: Input/output error
ls: cannot access testshare: Input/output error
total 68
16 drwxrwxrwx  8 root root 16384 2011-11-02 15:24 .
 4 drwxr-xr-x 22 root root  4096 2011-11-02 20:40 ..
16 -rw-------  1 root root  7168 2011-11-02 15:28 aquota.group
16 -rw-------  1 root root  7168 2011-11-02 15:28 aquota.user
 ? -?????????  ? ?    ?        ?                ? backup
 ? -?????????  ? ?    ?        ?                ? home
16 drwx------  2 root root 16384 2011-11-01 19:57 lost+found
 ? -?????????  ? ?    ?        ?                ? media
 ? -?????????  ? ?    ?        ?                ? testshare
 ? -?????????  ? ?    ?        ?                ? .timemachine
root@ubuntu:/mnt#


and what do I need to do to access the files in the folder "testshare"?


Some background info:

I have two identical ReadyNAS NV+ with four 750GB drives in each of them, using x-raid (giving ~2TB storage). One of them is totally messed up, and one is just fine. The working one is basically empty - it only has 8 jpeg images stored in a share called testshare. My thinking is that I need to prove that I can recover 8 lousy jpegs from the one that is working before I will have any chance of recovering thousands of precious jpegs from the trashed one 😞

My test setup:

MacBook Pro running VirtualBox, with a VM running ubuntu 10.04. lvm2 and fuseext2 are installed. I have created four virtual hard disks, each 698.64 GB, and attached them to the VM. I have created another virtual disk, which I use for accessing a physical hard drive attached to the host via a USB SATA adapter. I have cloned, one-by-one, each of the four disks from the working NV+, though only the first 5 GB, assuming that this should be more than enough data from each disk to be able to access the less than 20 MB of files on the RAID volume.

For cloning from the physical disk (always /dev/sdf) to each of the raid disks (/dev/sdb, sdc, sdd, sde) I used:

dd if=/dev/sdf of=/dev/sdb bs=512 conv=noerror,sync count=10485760

Here is the result of mounting and trying to access the raid volume:

root@ubuntu:~# pvscan
  PV /dev/sdb5   VG c   lvm2 [696.41 GiB / 0    free]
  PV /dev/sdc5   VG c   lvm2 [696.41 GiB / 0    free]
  PV /dev/sdd5   VG c   lvm2 [696.41 GiB / 5.00 GiB free]
  Total: 3 [2.04 TiB] / in use: 3 [2.04 TiB] / in no VG: 0 [0   ]
root@ubuntu:~# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "c" using metadata type lvm2
root@ubuntu:~# vgchange -a y c
  1 logical volume(s) in volume group "c" now active
root@ubuntu:~# lvscan
  ACTIVE            '/dev/c/c' [2.04 TiB] inherit
root@ubuntu:~# fuseext2 -o ro /dev/c/c /mnt
root@ubuntu:~# cd /mnt
root@ubuntu:/mnt# ls -lasc
ls: cannot access backup: Input/output error
ls: cannot access media: Input/output error
ls: cannot access home: Input/output error
ls: cannot access .timemachine: Input/output error
ls: cannot access testshare: Input/output error
total 68
16 drwxrwxrwx  8 root root 16384 2011-11-02 15:24 .
 4 drwxr-xr-x 22 root root  4096 2011-11-02 20:40 ..
16 -rw-------  1 root root  7168 2011-11-02 15:28 aquota.group
16 -rw-------  1 root root  7168 2011-11-02 15:28 aquota.user
 ? -?????????  ? ?    ?        ?                ? backup
 ? -?????????  ? ?    ?        ?                ? home
16 drwx------  2 root root 16384 2011-11-01 19:57 lost+found
 ? -?????????  ? ?    ?        ?                ? media
 ? -?????????  ? ?    ?        ?                ? testshare
 ? -?????????  ? ?    ?        ?                ? .timemachine
root@ubuntu:/mnt#


So close! :shock: What am I missing here?

Here is a list of my drives:

root@ubuntu:~# fdisk -lu

Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0002658d

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048    40105983    20051968   83  Linux
/dev/sda2        40108030    41940991      916481    5  Extended
/dev/sda5        40108032    41940991      916480   82  Linux swap / Solaris

Disk /dev/sdb: 750.2 GB, 750158987776 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465154273 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xb443b91b

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               2     4096001     2048000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sdb2         4096002     4608001      256000   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sdb3         4608002  1465112305   730252152    5  Extended
/dev/sdb5         4608003  1465112305   730252151+  8e  Linux LVM

Disk /dev/sdc: 750.2 GB, 750158987776 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465154273 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xb443b6e1

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               2     4096001     2048000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sdc2         4096002     4608001      256000   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sdc3         4608002  1465112305   730252152    5  Extended
/dev/sdc5         4608003  1465112305   730252151+  8e  Linux LVM

Disk /dev/sdd: 750.2 GB, 750158987776 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465154273 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xb443b6d3

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1               2     4096001     2048000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sdd2         4096002     4608001      256000   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/sdd3         4608002  1465112305   730252152    5  Extended
/dev/sdd5         4608003  1465112305   730252151+  8e  Linux LVM

Disk /dev/sde: 750.2 GB, 750158987776 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465154273 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sde doesn't contain a valid partition table
root@ubuntu:~#


Here is the xraid_config.log from the working NV+:

VERSION/ID::superblock=(0.1.0),ID=a201e221.00000000.00000000.00000000,create_time=4eb03fb5
RAID_INFO::disks_total=4,raid_disks=4,parity_disk=3,disks_online=4,disks_working=4,disks_failed=0,spare_disk=0,base_disk=0,size=1465128688,update_time=00000000,state=0,luns=2,extcmd=1,expandable_bitmap=0x0,lsize=1465128686,drive_present=0xf
LOGICAL_DRIVE:0:begin_sector=2,sectors=4096000,raid_level=1,status=redundant,initialized=1,dmap=f
LOGICAL_DRIVE:1:begin_sector=4096002,sectors=1461032686,raid_level=X,status=redundant,initialized=1,dmap=f
PHYSICAL_DRIVE:0:number=0,device=hdc,major=22,minor=0,raid_id=0,state=online,present=1,size=1465128688,r_model=ST3750640NS,r_size=1465128688,r_fw=3.AEG
PHYSICAL_DRIVE:1:number=1,device=hde,major=33,minor=0,raid_id=1,state=online,present=1,size=1465128688,r_model=ST3750640NS,r_size=1465128688,r_fw=3.AEG
PHYSICAL_DRIVE:2:number=2,device=hdg,major=34,minor=0,raid_id=2,state=online,present=1,size=1465128688,r_model=ST3750640NS,r_size=1465128688,r_fw=3.AEG
PHYSICAL_DRIVE:3:number=3,device=hdi,major=56,minor=0,raid_id=3,state=online,present=1,size=1465128688,r_model=ST3750640NS,r_size=1465128688,r_fw=3.AEG
RUN_PARAMETERS::raid_running=1,last_word=ok,interface_start_at=1,fake=0
RAID_REBUILD::sync=0,logical=0,parity=3,sectors=0,total=4294967295,source=f,total_drives=4,auto_sync=1
RAID_P_CHECK::chck=0,current_lun=0,total_luns=2,raid_level=0,err=0,current_sector=0,total_sectors=0,report_err=1
RAID_P_INIT::initialized_bitmap=0xf,initialize_error_bitmap=0x0,initializing_bitmap=0x0,current_sector=0,total_sector=0


And the partition.log from the working NV+:

Disk /dev/hdi doesn't contain a valid partition table

Disk /dev/hdc: 750.1 GB, 750145888256 bytes
255 heads, 63 sectors/track, 91200 cylinders, total 1465128688 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0xb443b91b

   Device Boot      Start         End      Blocks   Id  System
/dev/hdc1               2     4096001     2048000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/hdc2         4096002     4608001      256000   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/hdc3         4608002  1465112305   730252152    5  Extended
/dev/hdc5         4608003  1465112305   730252151+  8e  Linux LVM

Disk /dev/hde: 750.1 GB, 750145888256 bytes
255 heads, 63 sectors/track, 91200 cylinders, total 1465128688 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0xb443b6e1

   Device Boot      Start         End      Blocks   Id  System
/dev/hde1               2     4096001     2048000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/hde2         4096002     4608001      256000   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/hde3         4608002  1465112305   730252152    5  Extended
/dev/hde5         4608003  1465112305   730252151+  8e  Linux LVM

Disk /dev/hdg: 750.1 GB, 750145888256 bytes
255 heads, 63 sectors/track, 91200 cylinders, total 1465128688 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0xb443b6d3

   Device Boot      Start         End      Blocks   Id  System
/dev/hdg1               2     4096001     2048000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/hdg2         4096002     4608001      256000   82  Linux swap / Solaris
Partition 2 does not end on cylinder boundary.
/dev/hdg3         4608002  1465112305   730252152    5  Extended
/dev/hdg5         4608003  1465112305   730252151+  8e  Linux LVM

Disk /dev/hdi: 750.1 GB, 750145888256 bytes
255 heads, 63 sectors/track, 91200 cylinders, total 1465128688 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000


Hope you guys can help!

-Rexpo
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rexpo
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‎2011-11-07 02:01 AM
‎2011-11-07 02:01 AM

Re: Mount ReadyNAS NV+ RAID disks in Linux - Input/Output er

5GB isn't enough data read from the disks to be able to get at the filesystems properly. I tried again with 10GB and it worked, though I believe that I got lucky - seems like shortcuts aren't such a good idea after all and that I need to dd the whole disks into my test VM.

Mystery solved.

-Rexpo
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