Tag Archives: Storage

FreeBSD 9.2 supports ZFS TRIM/UNMAP

Just playing around with this today, and it’s very cool. FreeBSD 9.2 now supports TRIM/UNMAP for ZFS. To see if your disk is reporting the capability, look for kern.cam.da.<device>.delete_method where <device> is the number of the da device, i.e. /dev/da5 is “5” in that place. For example: # sysctl -a | grep delete_method kern.cam.da.0.delete_method: NONE kern.cam.da.1.delete_method:… Read More »

Don’t trust your primary data to a Drobo

I was reminded to data about the availability issues with storage. Of course, I live it every day on the “sell side” working for Pure Storage. But for my home lab and office, I tend to have “less than enterprise” requirements. Even so, my primary use of my DroboElite has been for secondary copies (backups)… Read More »

Why is one drive faster than the other?

I’m adding in an older Hitachi 1TB desktop drive to my FreeBSD ZFS server. I want to get it paired up with another Hitachi drive that’s in use on the system. Since I want both of the Hitachi drives to be my mirrored drives for my “backup” pool and filesystem (where our home laptops drop… Read More »

Out with the Hybrid, in with the SSD

A few months back  (OK, 6 months) I bought a Seagate Momentus XT for my unibody MacBook Pro. The theory of operations is great: Add 4GB of NAND Flash to a good 7200rpm hard drive, and cache the slow seeks. Slow thrashy reboots and application launches get cached, giving you SSD-like read speeds on some… Read More »

Why large USB SATA drives suck!

For the second time in the last 6 months I’ve got forensic evidence that not only does silent data corruption happen in real life, but also that “green” drives, hidden inside external USB enclosures, seem to be at higher risk than native attached SATA. I’ve seen this with two different enclosures, with different SATA drives,… Read More »