Re: ZFS, SSDs, and TRIM performance

2015-11-03 Thread Steven Hartland
This is something we've already done in FreeBSD, both myself and a others have iterated a few times on this very thing. There's currently nothing outstanding that I'm aware so its important to capture the details as people experience them to see if there is any more work to do in this area. On

Re: ZFS, SSDs, and TRIM performance

2015-11-03 Thread Nicolas Gilles
Not sure about the Samsung XS1715, but lots of SSDs seem to suck at large amounts of TRIM in general leading a "let me pause everything for a while" symptom. In fact I think there is work in ZFS to make TRIMs work better, and to throttle them in case large amounts are freed to avoid this kind of st

Re: ZFS, SSDs, and TRIM performance

2015-10-29 Thread Steven Hartland
If you running NVMe, are you running a version which has this: https://svnweb.freebsd.org/base?view=revision&revision=285767 I'm pretty sure 10.2 does have that, so you should be good, but best to check. Other questions: 1. What does "gstat -d -p" show during the stalls? 2. Do you have any oth

ZFS, SSDs, and TRIM performance

2015-10-29 Thread Sean Kelly
Me again. I have a new issue and I’m not sure if it is hardware or software. I have nine servers running 10.2-RELEASE-p5 with Dell OEM’d Samsung XS1715 NVMe SSDs. They are paired up in a single mirrored zpool on each server. They perform great most of the time. However, I have a problem when ZFS