You can read a bit more on the vdevdeflatratio here. This 341/512 fraction is called the vdevdeflateratio and it's what we'll multiply the pool size calculated above by to get usable space per vdev after parity and padding. One 16 GB CACHE vdev at da0 on USB 2.0 for the pool on the external HDD.Īda0p2 0:134 512K freebsd-boot gpt/gptboot0 -Īda0p3 0:136 16G freebsd-swap gpt/swap0 SWAPĭa1p1 0:222 466G freebsd-zfs gpt/FreeBSD%20ZFS īefore sleeping/suspending the computer, I: One 32 GB CACHE vdev at da2 on USB 3.0 for the pool on the internal HDD Two Kingston DataTraveler G4 flash drives: This pool is primarily for VirtualBox-related data (ISO files, virtual drives and snapshots). Pool Transcend is on a Transcend StoreJet 25M mobile hard disk drive at da1 on USB 2.0. Pool copperbowl is on the internal drive.

Qualitatively, holistically, the system does feel better. I have not yet measured, but I'm almost certain that startup times are significantly better than before the experiment.

… In general, if an admin has one or more CACHE vdevs installed, he or she should be looking for an l2 hit ratio (l2_hits / (l2_hits+l2_misses)) of at least 25%. Installed on : Mon Mar 1 05:57:12 2021 GMTįreeBSD 14.0-CURRENT #94 main-n246499-097e8701c9f: Thu May 6 07:26: that's a level 2 hit ratio of around 47%.įrom OpenZFS: All about the cache vdev or L2ARC | Klara Inc. To start viewing messages, select the forum that you want to visit from the selection below. You may have to register before you can post: click the register link above to proceed.

Gpt/FreeBSD%20ZFS 323G 141G 30 24 2.03M 1.67M Todays Posts Mark Channels Read Member List Calendar Forum Phoronix General Discussion If this is your first visit, be sure to check out the FAQ by clicking the link above. ZFS Subsystem Report Sun May 9 09:42:25 2021 Today, for example, with an uptime of around four hours: % date uptimeĩ:42a.m. This type of thing is not for everyone, but I'm quite pleased with the results. Around three weeks ago, I began experimenting with USB flash drives for low end L2ARC on an old notebook with a 7,200 rpm hard disk drive and 16 GB memory.

Vdev eviction openzfs