link Cisco 4506-E not supplying PoE to devices

We had an issue where some Cisco 7942 IP phones were not powering on after being unplugged while others worked as expected. Plugging the network cable directly into a computer brought up the link. The solution was to reset the line card.

link Flush Exchange 2010 Transaction Logs

In my case I was lucky and saw event 10014 from MSExchangeIS Mailbox Store saying "Available disk space for the database logs is extremely low. Message delivery to the database may be stopped.". There was still 1GB free so inbound email was still being queued on the Exchange server but not delivered to any mailboxes.

There were also many reports of event 629 from ESE "While attempting to move to the next or previous node in a B-Tree, the database engine skipped over 10421 non-visible nodes in 42 pages." 

I traced the cause back 4 days to event 4121 from MSExchangeRepl saying "The Microsoft Exchange Replication service encountered an error when retrieving the database copy statuses during the periodic operation 'AmPeriodicDatabaseStateAnalyzer'. The operation will be retried later." When replication fails the transaction logs are blocked from flushing after full backup. This caused a buildup of 90GB worth of transaction logs which needed to be deleted.

link Install Citrix Receiver on CentOS 6

The installation is pretty straight forward but I'm detailing the steps for posterity. The only difficulty I encountered is that I'm running 64bit CentOS and even though I downloaded the 64bit Receiver RPM it is still linked to the i686 (32bit) packages. Instructions for both architectures are included.