On Fri, Jan 24, 2020 at 11:36:45PM +1100, Russell Coker wrote: > https://doc.coker.com.au/training/btrfs-training-exercises/ > https://doc.coker.com.au/training/zfs-training-exercises/ > > I've put some simple BTRFS and ZFS training exercises at the above URLs > (this is the training that was done at a LUV Saturday meeting in 2015). As > they involve deliberately corrupting data to exercise the filesystems it's a > good idea to to this on a VM so a typo won't cause problems.
Nice. If you ever do an update of these, I'd suggest adding snapshot & send/receive exercises because doing backups with snapshots is one of the best features of both btrfs and zfs - better than rsync in a tiny fraction of the time (minutes vs hours). This would require two pools so add, e.g., /dev/vd[fgh] virtual drives to the VM. Or run two VMs to show remote send/receive via ssh. 100 or 200 MB each is enough for each pool drive. BTW, I noticed two minor problems with the zfs instructions: First is that you tell the reader to add the buster-updates contrib repo to sources.list, then tell them to install spl-dkms and zfs-dkms from buster-backports. This should probably add the buster-backports repo instead: deb http://mirror.internode.on.net/pub/debian/ buster-backports contrib main The second is that spl-dkms is no longer needed with zfs 0.8 and above, it's a dummy package. buster-backports contains zfs 0.8.2 Getting rid of spl-dkms doesn't make it any faster to install & compile the zfs module - most of what was in spl-dkms has been folded into zfs-dkms. (on my threadripper 1950x box, it takes about a minute or a minute and a half to compile the zfs module. on my older Phenom II and FX-8xx0 boxes, it takes around 5 minutes) BTW, zfs 0.8.3 just arrived in unstable/sid. the NEWS.Debian.gz file says: zfs-linux (0.8.3-1) unstable; urgency=medium The SIMD acceleration has been fixed in this upstream release. Users could use the following two commands to double check: $ cat /sys/module/zfs/parameters/zfs_vdev_raidz_impl $ cat /sys/module/zcommon/parameters/zfs_fletcher_4_impl Another notable change is the parallelization of the KABI checks during the configure stage, which may significantly boost the postinst stage of zfs-dkms that builds the kernel module. -- Mo Zhou <lu...@debian.org> Sat, 25 Jan 2020 13:26:02 +0800 I just upgraded my ztest VM to this today. Compiled and rebooted without problem. Will upgrade my actual machines over the next few days or so. craig -- craig sanders <c...@taz.net.au> _______________________________________________ luv-main mailing list luv-main@luv.asn.au https://lists.luv.asn.au/cgi-bin/mailman/listinfo/luv-main
