Archives: 2014 February

Good all-day light laptop?

February 24th, 2014, 32 Comments

I am trying to find a laptop with all-day battery life that’s fairly light. Perhaps I am dreaming too big here, but I thought I’d toss out my hopes and see if there are any recommendations. I am hoping for: Battery life around 9 hours powered up Fairly light. 2 or 3 pounds would be […]

Backing up every few minutes with simplesnap

February 13th, 2014, 5 Comments

I’ve written a lot lately about ZFS, and one of its very nice features is the ability to make snapshots that are lightweight, space-efficient, and don’t hurt performance (unlike, say, LVM snapshots). ZFS also has “zfs send” and “zfs receive” commands that can send the content of the snapshot, or a delta between two snapshots, […]

Migrated from Hetzner to OVH hosting

February 7th, 2014, 5 Comments

Since August 2011, my sites such as have been running on a Xen-backed virtual private server (VPS) at Hetzner Online, based in Germany. I had what they called their VQ19 package, which included 2GB RAM, 80GB HDD, 100Mb NIC and 4TB transfer. Unlike many other VPS hosts, I never had performance problems. However, I […]

VirtFS isn’t quite ready

February 7th, 2014, 9 Comments

Despite claims to the contrary [PDF], VirtFS — the 9P-based virtio KVM/QEMU layer designed to pass through a host’s filesystem to the guest — is quite slow. I have yet to get it to perform at even 1/10 the speed of the virtual block device (VBD). That’s unfortunate, because in theory it should be significantly […]

How to fix “fstrim: Operation not supported” under KVM?

February 6th, 2014, 9 Comments

Maybe someone out there will have some ideas. I have a KVM host running wheezy, with wheezy-backports versions of libvirt and qemu. I have defined a guest, properly set discard=unmap in the domain XML file for it, verified that’s being passed to the guest, but TRIM/DISCARD is just not working. Mounting the ext4 filesystem with […]

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