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Recent Blog Entries
March 1, 2013
I recently ran into an issue installing FreeBSD on a system that already had some disks & zpools. Because the disks were partitioned previously, automatic multipath was not an option as the last sector of all hard drives isn’t available to store an ID. The remaining option is to do manual multipath, and it needs to be done every time the system boots.
Here’s an rc script that will run early in the sequence and create a multipath “link” between drives based on their serial number.
/etc/rc.d/manual_multipath
#!/bin/sh
# [snip...]
November 9, 2012
Sending ZFS snapshots across the wires can be done via multiple mechanisms. Here are examples of how you can go about it and what the strengths and weaknesses are for each approach.
SSH
strengths: encryption / 1 command on the sender
weaknesses: slowest
command:
zfs send tank/volume@snapshot | ssh user@receiver.domain.com zfs receive tank/new_volume
NetCat
strengths: pretty fast
weaknesses: no encryption / 2 commands on each side that need to happen in sync
command:
on the receiver
netcat -w 30 -l -p 1337 | zfs [snip...]
October 5, 2012
With the ever growing number of Apple devices here at Thayer School, Bonjour is quickly becoming a critical protocol of our I.T. infrastructure.
To say the least, Bonjour is not designed for an enterprise environment. Sill, we advertise our printers with it in an effort to accommodate Apple users.
Here is a script I wrote that will discover which printers are currently advertised on the network. We use it along with a Nagios check to make sure [snip...]
