Month: September 2012
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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 Review – Part One
If you’re in the market for an understated, quiet case that performs well and leaves plenty of room for expansion the Fractal Design Define series is quite likely to be on your list of cases to investigate. The latest revision of the case is R4, which draws upon user feedback on the R3…
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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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Fractal Design Define R4 vs. R3: Size Matters
Here is a comparison of the Define R3 and R4, side by side – the R4 is the larger, black case and the R3 is in white. When the front panels are lined up like so… The rears meet like so: Same length! As for the width: As you…
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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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New graphics cards in the works…
We got some new gear in-house – while a full review is coming, here’s a teaser photo…
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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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New Product: 1U Rack Dual Temperature and Humidity Sensor
We had some requests for a 1U sensor that did more than just read the temperature in one spot in the chassis and after looking at what was available we decided to make our own. Featuring two temperature sensors with 1M probes and an ambient temperature+humidity sensor, it’s a great way of measuring…