Date: Wed, 24 May 2023 16:24:23 +0000 From: Arthur Chance <freebsd@qeng-ho.org> To: Steven Friedrich <freebsdlouisville@gmail.com>, questions@freebsd.org Subject: Re: zfs-on-root, missing swap (fixed subject) Message-ID: <dd30b9f8-6b1d-37aa-5830-d95b47eb2d65@qeng-ho.org> In-Reply-To: <be25674e-6339-74dc-09dd-b9092bb0743d@Gmail.com> References: <af474797-06eb-bd54-5909-d8d38483a4b2@Gmail.com> <bfe59e8b-8d2e-11b1-1cfd-8b5ae2a6ade9@Gmail.com> <646cc38a-ab59-1bf2-d7c6-d25371159810@FreeBSD.org> <be25674e-6339-74dc-09dd-b9092bb0743d@Gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 24/05/2023 15:54, Steven Friedrich wrote: > On 5/24/23 10:54 AM, Matthew Seaman wrote: >> On 24/05/2023 14:20, Steven Friedrich wrote: >>> On 5/24/23 8:59 AM, Steven Friedrich wrote: >>>> Just this morning, I installed 13.2 on a USB 500 GB SSD I changed >>>> swap size from 2GB to 128GB. >>>> >>>> Running synth to install kde5, noticed several build fails and synth >>>> claims swap is n/a. >>>> >>>> Checked both df and mount, no swap shown. Also swapinfo shows no swap. >>>> >>>> Where did it go? >> >> What's the result of `gpart show /dev/ada0` ? (Assuming ada0 is the >> correct device name for your SSD device.) >> >> You should see something like this: >> >> ``` >> # gpart show /dev/ada0 >> => 34 976773101 ada0 GPT (466G) >> 34 6 - free - (3.0K) >> 40 984 1 freebsd-boot (492K) >> 1024 16776352 2 freebsd-swap (8.0G) <<<-----**** >> 16777376 959995752 3 freebsd-zfs (458G) >> 976773128 7 - free - (3.5K) >> ``` >> >> which tells you the allocated swap area is /dev/ada0p2. You should >> then be able to add a line in /etc/fstab like so: >> >> /dev/ada0p2 none swap sw 0 0 >> >> and then run: >> >> `service swap start` >> >> More complicated setups are possible, like swapping to a gmirror >> across partitions on two physical drives, or using glabel to name the >> partition -- useful if you have removable drives that can upset the >> device numbering. >> >> It's not advisable to swap to a ZFS or to a file held on ZFS: >> performance will be bad and you run the risk of system lockups where >> ZFS will demand more swap before it can provide access to the swap area. >> >> 128GB is (I think) the absolute maximum configurable swap size in >> FreeBSD 13.2 -- generally it's advisable to limit swap to about the >> same as RAM on systems with more than 4GB RAM. See tuning(7). >> >> Cheers, >> >> Matthew > > Thanks for the response. I already discovered the problem. I was > installing from a USB stick, whuch was assigned da0. When I rebooted, I > pulled that and the SSD became da0, instead of da1. > > All I had to do was edit /etc/fstab and change da1p3 to da0p3. 8o) It makes a lot of sense to use GPT labels to avoid that sort of problem. They remain the same even if disk numbering changes. > I also re-installed because it was complaining about swap size. I > re-installed with only 64GB swap. > -- We build our computer systems the way we build our cities; over time, without a plan, on top of ruins. — Ellen Ullman
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?dd30b9f8-6b1d-37aa-5830-d95b47eb2d65>