Category: How-To
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Ubuntu: How to view results of “ls” one page at a time
If you’re listing the contents of a directory using the “ls -l” command in a terminal window you may find that the number of results cause pages of text to fly past your screen, leaving you with only the last page to look at. If you aren’t using a terminal which you can scroll back…
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ZFS: Stopping a scrub
If you accidentally started a scrub on a pool or need to stop one for any reason it’s fortunately quite straightforward: # zpool scrub -s [poolname] e.g. zpool scrub -s kepler You can check on whether that was successful with zpool status – it will give an output above the pool…
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Fractal Design Define R4: Does a Corsair H100 cooler fit in the front?
With the release of the Fractal Design Define R4 we have been asked a few times about whether Corsair’s self-contained liquid cooling system will fit in the front. Placement here has a few advantages over placing it in the top of the chassis; noise is reduced, for a start, and if you use…
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Fractal Design Define R4: Removing all of the front drive trays
Someone asked how we removed the hard drive bays in the Fractal Design R4 builds we’re doing at the moment, so we wrote up a quick post for those who are wondering. If you want to install a radiator to the front of the R4 or are simply using a handful of SSDs…
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How to add a drive to a ZFS mirror
Sometimes you may wish to expand a two-way mirror to a three-way mirror, or to make a basic single drive vdev into a mirror – to do this we use the zpool attach command. Simpy run: # zpool attach [poolname] [original drive to be mirrored] [new drive] An example: # zpool attach seleucus…
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ZFS Basics – zpool scrubbing
One of the most significant features of the ZFS filesystem is scrubbing. This is where the filesystem checks itself for errors and attempts to heal any errors that it finds. It’s generally a good idea to scrub consumer-grade drives once a week, and enterprise-grade drives once a month. How long the scrub takes depends…
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ZFS folders on Ubuntu not mounting after reboot
After upgrading to 12.04 people seem to be finding that their ZFS shares aren’t mounting on boot; this has an easy fix, fortunately – edit your /etc/rc.local file and add: stop smbd stop nmbd zfs mount -a start smbd start nmbd Save and reboot and your shares should be intact. This has worked…
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How to find kernel version in Ubuntu 12.04 Precise Pangolin
Note: This also works in other versions of Ubuntu, such as 11.10, 11.04, 10.10, 10.04 and earlier. Sometimes you may wish to find out which kernel you’re currently running; fortunately, this is quite easy to do with the uname command. If you’re running Ubuntu Desktop, open up a Terminal; if you’re using Ubuntu Server…
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How do you tell which zpool version you are running?
This is a question that crops up fairly regularly, as different operating systems support different zpool versions. Fortunately, it’s quite easy to find out which versions you are running – simply run: # zpool upgrade If you want a more detailed readout, including the features of the pool version you have, try: …
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Proper mounting of Corsair AF120 or SP120 coloured rings
Can’t get your coloured ring to sit properly on your new Corsair fan? You’re not alone – we’ve had a few customers find it difficult getting their rings to sit correctly in the fans.