Author Archives: neilb

About neilb

Computing staff at the University of Edinburgh. Part of the Services Unit.

Planned group space downtime

The disk array ifevo3 has a fault with its flash memory. Though it may be just about possible to replace the faulty memory without disrupting the file service, the recommendation is to shut down the the disk array to do … Continue reading

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Explanation of Yesterday directory

As happened today, “Yesterday” isn’t always yesterday! A brief explanation. All AFS home directories (and some group areas) contain a Yesterday sub-directory. This directory contains a copy of your home directory from “Yesterday”, which can be useful if you accidentally … Continue reading

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SAN firmware update April 2015

AFS file space at risk this coming weekend. Continue reading

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Changes to default apache configuration

A few weeks ago we rolled out some new sensible default apache configuration to all our web servers. These configuration changes will affect all DICE web servers unless their manager has chosen to exclude or modify some of these settings. … Continue reading

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Removal of RC4 from HTTPS Cipher Suite

In line with current best practice we will shortly be removing the RC4 stream cipher from our Apache HTTPS sites. Indeed we’ve already removed it from https://wiki.inf.ed.ac.uk without any apparent issues. For more details see: http://en.wikipedia.org/wiki/RC4 Modern browsers will connect … Continue reading

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SATABeast2 disk failures

Yesterday evening, our SAN storage device satabeast2, suffered 2 disk failures. We can cope with 1 disk failure (RAID5), but following that first disk failure there is a period of time, while the redundancy is restored, that should a second … Continue reading

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Local addition to mailman (lists.inf.ed.ac.uk)

We’ve recently made a small local change to mailman that allows users with the appropriate entitlement, automatic access to a list admin web page. Similarily, entitlements can now also be used to limit the visibility of the mailing list archives. … Continue reading

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SAN problems of 27th March 2014

Following the unplanned power cut on Tuesday, one of our SAN machines (ifevo4) started reporting a problem with the flash cache memory in one of its controllers. The machine has two controllers, A and B, for redundancy. Both with two … Continue reading

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Home directory quota problem on Tuesday

On Tuesday 4th of March there was a period of a few minutes, from 11:15am to about 11:25am, when most peoples’ home directory quota was incorrectly shrunk to 2MB. Anything trying to write to home directories during that time will … Continue reading

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Replacement of failed SAN controller

We have received a replacement for the SAN controller that failed following the power cut of the 11th of November. We had to abort our plan to replace it yesterday (Monday 18th) after we discovered there’s not enough slack in … Continue reading

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