Date: Sun, 15 Oct 2023 17:39:22 +0100 From: void <void@f-m.fm> To: freebsd-hackers@freebsd.org Subject: Re: zpool geli encryption question Message-ID: <ZSwVurVf27qZvmTd@int21h> In-Reply-To: <CAOtMX2jAs9%2BM79N-4LC9EdZ3y4jbvhWEWCs9KFxL9r=6zt%2BwZw@mail.gmail.com> References: <ZSvrhL3IV4642-n5@int21h> <CAOtMX2jAs9%2BM79N-4LC9EdZ3y4jbvhWEWCs9KFxL9r=6zt%2BwZw@mail.gmail.com>
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On Sun, Oct 15, 2023 at 07:17:57AM -0700, Alan Somers wrote: >How much of the FreeBSD VM's disk is actually in-use? (in the example below, another vm instance, same observation) from the host: NAME USED AVAIL REFER MOUNTPOINT ssdzfs/fbsd140Rv1 97.5G 309G 21.3G - within the booted vm: NAME AVAIL USED USEDSNAP USEDDS USEDREFRESERV USEDCHILD zroot 74.8G 9.97G 0B 96K 0B 9.97G zroot/ROOT 74.8G 4.61G 0B 96K 0B 4.61G zroot/ROOT/default 74.8G 4.61G 0B 4.61G 0B 0B zroot/home 74.8G 59.6M 0B 59.6M 0B 0B zroot/tmp 74.8G 120K 0B 120K 0B 0B zroot/usr 74.8G 5.28G 0B 96K 0B 5.28G zroot/usr/ports 74.8G 5.28G 0B 5.28G 0B 0B zroot/usr/src 74.8G 96K 0B 96K 0B 0B zroot/var 74.8G 1.17M 0B 96K 0B 1.08M zroot/var/audit 74.8G 96K 0B 96K 0B 0B zroot/var/crash 74.8G 96K 0B 96K 0B 0B zroot/var/log 74.8G 564K 0B 564K 0B 0B zroot/var/mail 74.8G 252K 0B 252K 0B 0B zroot/var/tmp 74.8G 96K 0B 96K 0B 0B gzipped archive: -rw-r--r-- 1 root wheel 21G 15 Oct 16:39 2023.10.15_15:57.fbsd140Rv1.gz >Maybe you are using TRIM with FreeBSD, which punches holes in the host's ZFS >storage. On the bhyve host (14.0-BETA3 #0 releng/14.0-n265111) vfs.zfs.vdev.trim_min_active: 1 vfs.zfs.vdev.trim_max_active: 2 vfs.zfs.trim.queue_limit: 10 vfs.zfs.trim.txg_batch: 32 vfs.zfs.trim.metaslab_skip: 0 vfs.zfs.trim.extent_bytes_min: 32768 vfs.zfs.trim.extent_bytes_max: 134217728 vfs.zfs.l2arc.trim_ahead: 0 vfs.ffs.dotrimcons: 1 Does this mean trim is enabled and active on the host? I didn't set it. Maybe it was automatically set because zfs knows the hardware is SSD? > That would explain why compression seems to save space, even > though the data is encrypted. That's really smart. TYVM for the explainer. --
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