Clint, The Wikipedia article <https://en.wikipedia.org/wiki/Trim_(computing)> has this to say about TRIM on a Linux system: > Initial support for discard operations was added for FTL NAND flash > devices in 2.6.28. Support for the ATA Trim command was added in 2.6.33. > Not all filesystems make use of Trim. Among the filesystems that can issue > Trim requests automatically are Ext4, Btrfs, FAT, GFS2 and > XFS. > However, this is disabled by default due to performance concerns, but can > be enabled by setting the "discard" mount option. Ext3, NILFS2 and OCFS2 offer > ioctls to perform offline trimming. The Trim specification calls for > supporting > a list of trim ranges, but as of kernel 3.0 trim is only invoked with a single > range that is slower. So, if you don't see the "discard" option in the mount(1) output, then it would appear that TRIM isn't enabled. > No problem. As you noticed, it's doing well -- better than I expected. Yes, > I did go > with ext4 and the default mounting options. I'm not exactly sure what those > are on our > system and I'd like to find out if TRIM is enabled, but I'm not exactly sure > how to > determine that, or even if it matters for the product queue (which is the > only thing on > the SSD). If you or Mike have some guidance on that, I'd certainly like to > hear it. I > found a pretty good (I think) explanation/how-to at > http://blog.neutrino.es/2013/howto- > properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/. I'm > not using > dm-crypt (whatever that is) and there's only a single disk (other than the > SSD), so no > LVM, either. That leaves his recommendation of not using the discard option > in fstab > and, instead, running fstrim periodically -- which he makes a good case for. > > Clint Regards, Steve Emmerson Ticket Details =================== Ticket ID: SJF-337060 Department: Support LDM Priority: Normal Status: Closed
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