Tag Archives: ZFS

FreeBSD 9.2 supports ZFS TRIM/UNMAP

By | April 15, 2014

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

By | December 28, 2013

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?

By | May 1, 2011

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 »

Why large USB SATA drives suck!

By | December 22, 2010

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 »