Shawdow Protect locks up mounting an image in Backup Explorer

 I'm running Server Edition on 2008 Server Standard (I installed 32 bit edition to preserve compatibility with legacy educational apps) with 4Gb RAM and a 4 core Xeon at 2.5Ghz.  Occasionally I'm asked to recoved a deleted or overwritten file from the backup (on a Buffalo NAS).  About half the time lately, ShadowProtect locks up during the final stage of the mounting the image (Task Manager reports ShadowProtect as "not responsing", after dependent files have been identified, after "Click Finish to mount the backup image".  Ususally, I can successfuly mount images after a re-boot.  Fortunately, I can usually get away with it at the end of a school day, but it is not convient in a production environment.  What are the steps to trouble shoot this problem.  Under the 32 bit environment, I am already at maximum ram.

Comments

FTTester

Re: Shawdow Protect locks up mounting an image in Backup Explore

Is there any obvious pattern to when you encounter this problem? For instance:

  1. Whole system problem, or just SP?
    If the problem that SP becomes unresponsive, or is it the whole system? If it is the latter, then you might have a conflict with another application. Do you have any Antivirus application that might be getting in the way. Any other backup or other application trying to use the VSS framework. Are you using the Windows recovery feature against any of the volumes?
  2. Is the problem isolated to specific backup image files?
    If you encounter a problem mounting a backup file, do you still have a problem mounting that file after a reboot. If you do, then you may have a corrupt backup image file. Run a Verify against the backup image, together with a chkdsk against the NAS.
    Is the problem restricted to backup files that are part of a long chain of backups?
  3. Is the problem time specific?
    Do you only have the problems at specific times of the day? Look for another application that is running at the same time. Check the event logs. Check system load using Process Explorer.
  4. Is the problem NAS specific
    If you temporarily copy a problematic backup chain to a different (internal) disk, do you ever have a problem?
    When SP becomes unresponsive, can you still write/read files to and from the NAS using Windows Explorer? If you cannot, then it would be worth looking a little more closely into a potential problem with the NAS. 
  5. Are there any disk-related problems with the NAS
    Run a ckdsk against the NAS to check the state of the NAS filesystem.
    Also keep in mind that these "cheaper" NAS products are not that good at inidicating whether a disk is failing within its 'fake' RAID. If you are running a RAID, then it would worth running a low-level disk check against the drives (e.g. Seagate Tools).

Some things worth trying:

  • Check System/Application Event log for disk/filesystem/SP related warnings or errors
  • Download and install any firmward or software relating to the NAS
  • Run chkdsk and low-level disk check against NAS and HDDs within NAS
  • Download and use Microsoft's Process Explorer - it's better for troubleshooting than Task Manager
  • Run an SP verify against the backup files

 

 

 

DGrier

Re: Shawdow Protect locks up mounting an image in Backup Explore

 Sorry about the tardy reply, this is my first time back on site.

 1.  Just SP.  I haven't left it long enough to know if would prevent scheduled backups, but Task Manager tells me the SP Server Edition is "Not Responding".

2.  No, I can reboot and load the same image just fine,  this seems more like a memory leak.  (i.e., force everything to close and I have enough memory to mount the image).

3.  Not time specific, I've had had this happen morning afternoon and evening

4.  I only have the one NAS,  next time I lock up SP I'll try browsing the folder.  The Buffalo apps that came with the NAS seem to work OK when SP locks up.

 5.  Chkdsk against NAS - "Windows cannot check a disk attached through a network".  Howerver, I logged into the TerraStation via a browser and ran the internal disk check and got no errors.

 

I've been getting repeated Event 408, ESENT Lsass (688) unable to write to logfile \\?|STC Snapshot Volume 21 1\ADlog\NTDS\edb.log.  Error-1032 (Oxfffffbf8)

and

Event 482 lsass (688) lsass (688) An attempt to write to the file "\\?\STC_SnapShot_Volume_21_1\ADLog\NTDS\edb.log" at offset 211968 (0x0000000000033c00) for 512 (0x00000200) bytes failed after 0 seconds with system error 19 (0x00000013): "The media is write protected. ".  The write operation will fail with error -1032 (0xfffffbf8).  If this error persists then the file may be damaged and may need to be restored from a previous backup.

 I found a reference that said these errors are common with ShadowProtect and quit looking.

 

Do you mean Sysinternal's Process Explorer, a search of Microsoft's site takes me there?

Verify only gives me 4 volume files in the backup directory.  I didn't note which ones I had trouble with.  I did let SP verify one and there were no errors.

 It should be noted that the Buffalo NAS was delivered with the date set three months behind the server.  I corrected it but the file dates are off on these images I am mounting.

FTTester

Re: Shawdow Protect locks up mounting an image in Backup Explore

If this was working fine, and more recently you have started to get more and more problems, I'd be tempted to take another look at the NAS. If it was a memory leak you, along with everyone, would be seeing a problem. I'd be tempted to update the NAS BIOS, firmware, any drivers and then run a low-level disk check (e.g. from Seagate tools). It would take a little time, but certainly won't do any harm.

When I asked about the time, I should have been a little clearer. Does the problem occur when another appplication or workstation is accessing, or using, the NAS? Does it occur when the machine running SP is perrforming a specific task (e.g. virus scan)?

[quote user="DGrier"]

Do you mean Sysinternal's Process Explorer, a search of Microsoft's site takes me there? [/quote] Yes. SysInternals were bought by Microsoft a short while back. The SysInternal tools are useful to have around - especially Process Explorer.

[quote user="DGrier"]

Verify only gives me 4 volume files in the backup directory.  I didn't note which ones I had trouble with.  I did let SP verify one and there were no errors.

[/quote] If you can, run a verify against all the images. If there is a corrupt image....I'm guessing there might be a problem mounting it.

[quote user="DGrier"]

 It should be noted that the Buffalo NAS was delivered with the date set three months behind the server.  I corrected it but the file dates are off on these images I am mounting.

[/quote] Ideally, these should be within a few minutes of each. If you can figure a common NTP server, that would help. As to whether the data/time of the files can cause a problem when mounting them.....I'm not sure. If you set up the NTP on the server and NAS, it will be interesting to see if you then see a problem.