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Author: Steve Radich - Founder BitShop, Inc. Created: 1/26/2009 4:43 PM
Troubleshooting Tips

If you have a large SQL Server database and run CheckDB you will find it takes a while before reporting any details.

There's a few very long running steps, especially if you have a very large error count - find out more..

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For BitShop's cloud storage infrastructure we rely on Oracle's ZFS technology, but sometimes things go wrong.  In today's example a zfs send / zfs recv hung and was manually aborted with a plan to simply restart it... Instead we had a significant issue.

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I had an instance today where a customer's dedicated server wouldn't run ASP.Net MVC after installing it.  The install went fine, .Net 4.0 was installed, everything looked ok - But the server just gave 403.14 errors and 404 errors due to the MVC routing not working.

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When I google for my site it returns the https:// secure site instead of my normal site.

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Windows 2008 has a new tool - Resource Monitor - which gives us some handy information in a quick, easy to visualize way. However this information doesn't come free.

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Perhaps you have a user who can't log into ftp on Windows Server 2008 R2 / IIS 7.5.  The built in FTP server integrates nicely with active directory, however it reported bad login for a specific user even after resetting their password.. the problem was..

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Sometimes applications don't seem to free up the resources they allocated after doing their processing - The most common resource is RAM when you hear this, memory leaks, however it could be other resources.

Any long running app needs to be careful that the ram is properly freed, in .Net this is relatively easy - Here's an example of not such an easy resource that APPEARS to be leaking (investigation in progress)..

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After you install PHP on IIS you may want to install phpMyAdmin somewhere.. This is a pretty simple process that's well documented..

However the most common error is 500 errors, which in reality tell you nothing. Here are some handy tips for a troubleshooting step I ran into today:

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Sometimes you may need to move your iSCSI targets to a different storage pool. The process is actually quite painless..

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This is what you REALLY don't want to see when replacing a failed drive in a RAIDZ (Raid5 like) array:

  pool: tank1
 state: DEGRADED
status: One or more devices has experienced an error resulting in data
        corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the
        entire pool from backup.
 scrub: resilver in progress for 28h8m, 100.00% done, 0h0m to go
config: (note: 100% done doesn't mean done, I don't know who wrote the % done formula but it's useless).

        NAME             STATE     READ WRITE CKSUM
        tank1            DEGRADED     0     0 6.32K
          raidz1-0       DEGRADED     0     0 12.8K
            c7t8d0       DEGRADED     0     0     0  too many errors
            c7t4d0       DEGRADED     0     0     0  too many errors
            c7t10d0      FAULTED     27   563     0  too many errors
            c7t11d0      DEGRADED     0     0     0  too many errors
            c7t12d0      DEGRADED     0     0     0  too many errors
            replacing-5  DEGRADED     0     0     0
              c7t13d0    FAULTED      4 9.60K     0  too many errors
              c7t3d0     ONLINE       0     0     0  384G resilvered

errors: Permanent errors have been detected in the following files:


So did we loose data? Read more..

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