[The device is not visible over the network, and there is not a serial port to ssh into, even if Buffalo allowed it, which I doubt they would. tftp only on other devices that had the serial port. The device runs, apparently normal, but simply does nothing at all useful. NasiNav cant see it even with a direct, known-good ethernet cable. Therefore, firmware revision is unknown.]
A User has lost access to data stored on a NAS device drive Buffalo LS-W1.0TGL/R1. THe unit has a default filessystem setup, using the entire available drive space for storage RAID0
Drive contains the primary and only copies of digital photos of her children since their birth, and other sentimental items. She thought bysaving it on the device she was performing a "backup". This is the only copy of the date in existence if the data still resides on the drives. Buffalo support has not been helpful thus far, by phone, according to the User. Therefore, I have ended up with this project.
The partition (table listing is below) uses an XFS file system.
This article practically reiterates the entire problem we are also dealing with. the XFS component has made the project particularly enjoyable for the user and myself! http://forums.popphoto.com/showthread.p ... alo-drives
I have been using Ubuntu12.04 Secure Remix, installed to a computer, and also Rescue Remix as a LiveCD
ATTEMPTS THUS FAR:
After plugging the drives into Windows7 and MacOS, just to see if I got lucky, I ran Matrox Kryptonite which balked since XFS support is weak. [XFS and Mac's BSD Unix just made my eyes bleed].
So, I rolled up my sleeves and used my trusty Ubuntu 12 laptop. It's an HP laptop, so it keeps the room nice and toasty!
DDrepair ubuntu and related tools have been used. I rigged up a direct cabling SATA to USB to one of the two drives inside the NAS, and connected via USB.
sudo ddrescue -r 3 -C /dev/sdx /media/rescuedata/image1.img /media/rescuedate/logfile
The results were not useful having tried to run ddrescue as follows: one drive at a time, and rescue files individually from each image, and also trying to append one drive to another (-C) . All images generated by ddrescue were not mountable. I tried to run mmls imagefile -b
but, the mount command would not run.. I tried
sudo mount -o loop,offset=16384 /media/rescuedata/image1.img /media/rescuedata2
sudo mount -t xfs -o loop,offset=16384 /media/rescuedata/image1.img /media/rescuedata2
The problem is that mmls appears to only support: dos mac, bsd, sun, gpt
mmls -t gpt -i raw /media/rescuedata/rescue1.img
"Invalid Magic Value" and the rest varies per filesystem type (bsd/gpt/dos/sun etc)
so I cant really see the offset size.. and therefore cant really mount the image.
I am running FOREMOST right now.. and that is going to take a while.. so I thought i was ask the forums their thoughts. I will update posts if Foremost does the job, otherwise, assume this is an open issue.
XFS_repair/XFS_check utilities yielded no joy..
The output of xfs_check is:
xfs_check: unexpected XFS SB magic number 0x4449534b
xfs_check: WARNING filesystem V1 dirs, limited functionality provided.
xfs_check: read failed: Invalid argument
xfs_check: data size check failed
cache_node_purge:refcount was 1, not zero (node=0xa0a4900)
xfs_check: cannot read root inode (22)
bad superblock magic number 4449534b, giving up
And when I try xfs_repair I get:
xfs_repair -n /dev/sdx (runs for a hours)
Phase 1 - find and verify superblock...
bad primary superblock - bad magic number !!!
attempting to find secondary superblock...
...found candidate secondary superblock... error reading superblock 115 -- seek to offset 493913702400 failed unable to verify superblock, continuing...
[or on another pass...]
...found candidate secondary superblock... error reading superblock 117 -- seek to offset 502503505920 failed unable to verify superblock, continuing...
[etc etc the above appears a few times, until finally]
...Sorry, could not find valid secondary superblock
Here is a sample of one of the two drives (both are identical):
Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 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: 0xf1bab5ab
Device Boot Start End Blocks Id System
/dev/sdc1 63 2008124 1004031 83 Linux
/dev/sdc2 2008125 12016619 5004247+ 83 Linux
/dev/sdc4 12016620 976768064 482375722+ 5 Extended
/dev/sdc5 12016683 14024744 1004031 82 Linux swap / Solaris
/dev/sdc6 14024808 974984849 480480021 83 Linux
TestDisk 6.13, Data Recovery Utility, November 2011
Christophe GRENIER <firstname.lastname@example.org>http://www.cgsecurity.org
Disk /dev/sdc - 500 GB / 465 GiB - CHS 60801 255 63
The harddisk (500 GB / 465 GiB) seems too small! (< 1261 GB / 1175 GiB)
Check the harddisk size: HD jumpers settings, BIOS detection...
The following partitions can't be recovered:
Partition Start End Size in sectors
Linux 873 1 1 120506 248 38 1921919744
> Linux 33769 1 1 153402 248 38 1921919744
[ Continue ]
XFS 6.2+ - bitmap version, 984 GB / 916 GiB
[Next I will be assembling a mock up RAID1 or RAID0 array with USB cables after I return from the Holy GeekStube, MicroCenter. I thought I would try ufsexplorer on various OS Platforms to see if it makes a difference.]
[I have a couple of other ideas, but it is becoming a question of time invested etc.. at this point... this is a reasonably slow process and some of it is necessarily trial and error.]
Bryan Grant Atlanta GA
Why does Buffalo use XFS on consumer devices? Most home users never think to buy and use a UPS, so.. why set them up for failure and data loss by selecting XFS?! I am just saying
"Due to balance of speed and safety, there is the possibility to lose data on abrupt power loss (outdated journal metadata), but not filesystem consistence"