2015 October

Good article benchmarking KVM storage

Published by Jim Salter // October 12th, 2015

http://www.ilsistemista.net/index.php/virtualization/47-zfs-btrfs-xfs-ext4-and-lvm-with-kvm-a-storage-performance-comparison.html Good stuff. Nice in-depth run of several different benchmarks for everything from fileserver to mailserver to database type usage. A bit thin on the ground for configuration, and probably no surprises here if you already read my KVM storage article from 2013, but it’s always nice to get completely independent confirmation. The author’s hardware setup was surprisingly wimpy – an AMD Phenom II with only 8GB of RAM – which may explain part of […]

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  • Demonstrating ZFS pool write distribution

  • One of my pet peeves is people talking about zfs “striping” writes across a pool. It doesn’t help any that zfs core developers use this terminology too – but it’s sloppy and not really correct. ZFS distributes writes among all the vdevs in a pool.  If your vdevs all have the same amount of free space available, this will resemble a simple striping action closely enough.  But if you have different amounts of free space on different […]