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3 servers rebooted
Jun 20th, 2014 by Tim Watts

ootw.cch had slightly weird kernel problems.

my-liv-2 was running with a load average of 11 (that’s bad)

tc-liv-4 had failed.

All have been rebooted now. All services are running normally.

subversion.cch.kcl.ac.uk is moving server on Friday 27th June
Jun 19th, 2014 by Tim Watts

UPDATE – date shifted again, due to last minute clash.

The old subversion server (known as svn.cch.kcl.ac.uk and subversion.cch.kcl.ac.uk) lives on old hardware which is not backed up.

I have a new setup with essentially identical config on a new Debian 7 virtual machine.

On Friday next week, between 1-1:30pm, I will switch the servers around. Please do not attempt to do an SVN checkout or commit during this half hour window.

You do not need to do anything else – the server should look identical as far as the client software is concerned.

Obviously – if you see anything that seems wrong after 1:30pm on Friday, please email me.

Thank you,

 

Tim

Schenker and ccedb.org.uk restarted
Jun 16th, 2014 by Tim Watts

Nagios reported sdo2.cch website had failed (all domains, all vhosts) and also http://ccedb.org.uk/

Both are now running correctly.

VMWare vForum at Wembley
Jun 12th, 2014 by Tim Watts

The usual vendors showing their wares, some interesting talks on new VMWare related software and some interesting ideas.

The most interesting idea from my point of view is this:

http://www.hgst.com/solid-state-storage/enterprise-ssd/pcie-ssd coupled with Caching layer software.

Basically you put mega fast flashram (or loads of extra RAM) into your VMWare hosts and the PernixData software inserts it as a read/write caching layer between VMWare guests and external normal storage SANs. Interestingly it’s not that expensive (around $4-5 per GB) as they are using MLC commodity flash chips rather than the exceedingly expensive industrial SLC chips. Wisdom has it that current MLC is robust enough for this type of use, thanks to the fact it’s been developed and manufactured so much more due to demand for decent flash for phones and *pads.

To avoid issues with sudden host failure or sudden flash card problems, the PernixData software replicates the cache between hosts over one of the private VMWare network links.

ereed server rebooted to correct website failure
Jun 10th, 2014 by Tim Watts

http://ereed.cch.kcl.ac.uk/ is now working correctly.

CeRch Drupal server failed – now fixed
Jun 2nd, 2014 by Tim Watts

The virtual disk on which the MySQL database lives went full, causing a number of sites to fail, including Strandlines and Historic Weather.

Apologies for the inconvenience.

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