ZFS

During the 2025-01-22 OpenZFS Production User Call, ‘atomic operations’ was mentioned with respect to ~/tmp/deleting zfs list -r -t snapshot data01/snapshots/deleting > ~/tmp/deleting 2.54s user 48.47s system 99% cpu 51.042 total 50 seconds. That’s OK. 60,000 deletes starting on the 23rd I started the delete. Actually, it’s not 60,000 deletes. It’s one destroy, of 60,000 snapshots. [12:52 r730-03 dvl ~] % time sudo zfs destroy data01/snapshots/deleting@1%60000 After starting the above command, I started […]

While I was destroying some snapshots, I found this interesting / disturbing. Why is the same destroy appearing twice, on different TTYs? [16:11 r730-03 dvl ~/tmp] % w | grep air dvl pts/2 air01.startpoint.vpn.unixathome.org 1:04PM 2:18 sudo zfs destroy data01/snapshots/homeassistant-r730-01@autosnap_2024-10-19_22:15:08_frequently dvl pts/1 air01.startpoint.vpn.unixathome.org Fri11PM – w dvl pts/4 air01.startpoint.vpn.unixathome.org 4:11PM – sudo zfs destroy data01/snapshots/homeassistant-r730-01@autosnap_2024-10-19_22:15:08_frequently dvl pts/5 air01.startpoint.vpn.unixathome.org 1:07PM 33 -zsh (zsh) What’s up with that? And why different times? It is not

Yesterday, I added a new drive into the system. Today, I will replace the failing drive with that one. In this post: FreeBSD 14.1 Before [18:23 r730-03 dvl ~] % zpool list NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT data01 32.7T 26.0T 6.76T – – 32% 79% 1.00x ONLINE – zroot 412G 18.5G 393G – – 18% 4% 1.00x ONLINE – [18:24 r730-03 dvl ~] % zpool status data01

This morning, I saw this in my logs: In this post: FreeBSD 14.1 r730-03 Looking in he logs, there wasn’t much useful: Searching online, I found swap_pager: cannot allocate bio so I decided to limit ARC size. I’ve done this before, and recently too.. Here is what I added to /boot/loader.conf: I just picked the same value I was using for another host. The values in the file can using units, such as