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mdguy · 09-15-2005, 10:26 AM

I was recently sent a 'failing' snap server 2200. The data on the device is important to its owner, and I'm in the process of trying to recover whatever I can from the device.

I was provided with no documentation/software. I was only given the 2200 unit and its power supply. The system is no longer under warrantee.

From what I'm told, the device was left in its default raid configuration (raid 0).

The hard drives have been imaged in their original state, so messing around with various approaches to getting the data off is fine, plenty of spare hard drives witht he same LBA to use.

Heres where I need help:

Upon booting up, the system light comes on while the LAN light never does. There is some initial hard drive activity, but that doesnt last for more than a second or two.

If you modify the jumper settings on the hard drive you can get the system/disk lights to alternate. According to the snap appliance website this means you should call tech support... Not exactly helpful as the device is no longer under warantee. While the device is in this state, the lan light does come on and network activity is acknowledged by the activity light. The device itself does not appear to be addressable.

I have run through the process of 'resetting' the device through the sequence provided on the snap appliance website. The device resets fine by exhibits the same behavior as before the reset.

The options I have available (unless you all can come up with something else) seem to be either:

A) Buy a an identical 2200 and place the hard drives with the data into it. This is already in the works, but I still have time to also try:

B) Trying to rebuild the array manually to recover the data... This is where I need a lot more information maybe some of you could provide.

I am assuming (unless told otherwise) that the stripe was configured with IDE1 as the first device followed by IDE2. I'm also guessing (by analyzing the data on the drives looking for patterns) that the stripe size seems to be abnormally large (16384 sectors, or 8192KB). If this information is correct (which I have been unable to verify with any degree of certainty) I am still unable to determine the file system in use on these devices. I have heard that it is a variation of FFS (Open FFS?) or possibly UFS. Other snap devices I've worked with have used XFS. I can't seem to locate any clues on the drive that would point towards a valid partition table or information telling me what file system is in use. If I could determine what file system is in use, rebuilding the array (using the default settings) and mounting the raid image to recover the files may be possible.

So questions:

Has anyone successfully recovered the data off of a raid in this scenario? If so, how?
What file system is in use on the 2200 models?
What is the default stripe size for a raid 0 configuration?
Which is the first device in a 2 hard drive raid 0 default configuration?
Does the actual raid begin at an offset of the drive, or at the first sector?

Any other clues are welcome, I have some time before the replacement unit comes in to try more stuff out.

I made an effort to read every post that looked relevant in this thread, so I apologize if any of these questions have been answered before.

Thanks.

09-15-2005, 10:26 AM	#706
mdguy Cooling Neophyte Join Date: Sep 2005 Location: md Posts: 1	2200 problem I was recently sent a 'failing' snap server 2200. The data on the device is important to its owner, and I'm in the process of trying to recover whatever I can from the device. I was provided with no documentation/software. I was only given the 2200 unit and its power supply. The system is no longer under warrantee. From what I'm told, the device was left in its default raid configuration (raid 0). The hard drives have been imaged in their original state, so messing around with various approaches to getting the data off is fine, plenty of spare hard drives witht he same LBA to use. Heres where I need help: Upon booting up, the system light comes on while the LAN light never does. There is some initial hard drive activity, but that doesnt last for more than a second or two. If you modify the jumper settings on the hard drive you can get the system/disk lights to alternate. According to the snap appliance website this means you should call tech support... Not exactly helpful as the device is no longer under warantee. While the device is in this state, the lan light does come on and network activity is acknowledged by the activity light. The device itself does not appear to be addressable. I have run through the process of 'resetting' the device through the sequence provided on the snap appliance website. The device resets fine by exhibits the same behavior as before the reset. The options I have available (unless you all can come up with something else) seem to be either: A) Buy a an identical 2200 and place the hard drives with the data into it. This is already in the works, but I still have time to also try: B) Trying to rebuild the array manually to recover the data... This is where I need a lot more information maybe some of you could provide. I am assuming (unless told otherwise) that the stripe was configured with IDE1 as the first device followed by IDE2. I'm also guessing (by analyzing the data on the drives looking for patterns) that the stripe size seems to be abnormally large (16384 sectors, or 8192KB). If this information is correct (which I have been unable to verify with any degree of certainty) I am still unable to determine the file system in use on these devices. I have heard that it is a variation of FFS (Open FFS?) or possibly UFS. Other snap devices I've worked with have used XFS. I can't seem to locate any clues on the drive that would point towards a valid partition table or information telling me what file system is in use. If I could determine what file system is in use, rebuilding the array (using the default settings) and mounting the raid image to recover the files may be possible. So questions: Has anyone successfully recovered the data off of a raid in this scenario? If so, how? What file system is in use on the 2200 models? What is the default stripe size for a raid 0 configuration? Which is the first device in a 2 hard drive raid 0 default configuration? Does the actual raid begin at an offset of the drive, or at the first sector? Any other clues are welcome, I have some time before the replacement unit comes in to try more stuff out. I made an effort to read every post that looked relevant in this thread, so I apologize if any of these questions have been answered before. Thanks.