Having switched off unauthenticated access to the SAN on the SAN, I had to work out how to set CHAP secrets on a per-host basis and modify iscsid.conf accordingly.  Cue considerable trial and error, but it seems to be working now.  The salient points being:  There is an … [Read more...]

This seems to have developed a couple of unhelpful quirks.   The first problem is that the default disk image file seems now to be qcow2, and there is no way to change this from the creation wizard.   The second problem is that it no longer names the disc image … [Read more...]

Or how to extract blood from a stone, linux style.   Ok.  The generic windows PPD for the Xerox 7855 doesn't quite do what we want.   The linux install on the xerox page seems to require you to set up queues and use a xerox-supplied print command.  A … [Read more...]

Configuring CUPS to print to papercut queues Out of the box most Linux systems (and Macs I believe) come configured to use their own local cups daemon.  The simplest way to print to papercut is to configure a queue on this service. 1. Check that client.conf isn't … [Read more...]

The zfs resilver delay is the amount of time in seconds zfs waits after any zfs io before queing any resilver operations, to avoid degrading performance. The default on oursystem appears to have the resilver delay as 2.  With that set, it takes 10+days to rebuild a disc … [Read more...]

After the upgrade from 7.0 to 7.1 I started playing with virtual kvm hosts again.  The good news is that migration seems now not to have the bug where sometimes the domain would not freeze just after transfer. The bad news is that in virt-manager on 7.1 the default mode … [Read more...]

Kickstart started giving a strange error about 'xfs' not being a valid default filesystem type - though it is.    I have replaced the initrd and vmlinuz served by the tftp servers with the ones from the centos/7/os/x86_64/images/pxeboot directory and it seems to be … [Read more...]