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ZFS with Redhat Cluster Suite
This is a very nice project I have been working on. The hardware at hand – two servers, with a shared SAS bus containing several SAS disks. Since it’s a shared bus, no RAID solution would cut it, and as I don’t want to waste disks with ASM (“normal” redundancy meaning half the size…), I…
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Two advanced bash tricks
Well, tricks is not the right word to describe advanced shell scripting usage, however, it does make some sense. These two topics are relevant to Bash version 4.0 and above, which is common for all modern-enough Linux distributions. Yours probably. These ‘tricks’ are for advanced Bash scripting, and will assume you know how to handle…
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bash | Disk Storage | Linux
Target-based persistent device naming
When Connecting Linux to a large array of SAS disks (JBOD), udev creates default persistent names in /dev/disk/by-* . These names are based on LUN ID (all disks take lun0 by default), and by path, which includes, for a pure SAS bus – the PWWN of the disks. It means that an example to such…
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XenServer – Setting virtual disks names based on the VM names
One of the worst things you can have in XenServer, is some wize-guy performing a ‘forget storage’ on a storage device still holding virtual disks related to VMs. As XenServer database is internal (for the whole pool) and not per-VM, all references to this virtual disks disappear, and you remain with bunch of VMs without…
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XenServer get VM by MAC
Using the GUI, it could be somewhat complex identifying a VM based on its MAC address. There are several solutions on the network using PowerShell, but I will demonstrate it using a simple bash script, below. Save, make executable, and run. Enjoy #!/bin/bash if [ -z “$1” ] then echo “Requires parameter – MAC…