Date: Mon, 28 Jan 2019 19:54:58 +0000 (UTC) From: Benedict Reuschling <bcr@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r343532 - head/usr.bin/fortune/datfiles Message-ID: <201901281954.x0SJswMV096406@repo.freebsd.org>
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Author: bcr (doc committer) Date: Mon Jan 28 19:54:58 2019 New Revision: 343532 URL: https://svnweb.freebsd.org/changeset/base/343532 Log: A few corrections and clarifications to r343406. - Use "in" instead of "on" when referring to directory and UFS partition. - Switch from hw.physmem to hw.realmem and add a description to distinguish the two. - Explain why the "df" command is having trouble displaying ZFS sizes correctly. Add a bit more descriptive text to help why the output of "zfs list -o space" should be used. - Switch to vmstat instead of iostat display for systat(1) as it shows more information on one screen. Describe what is displayed based on the text of the man page. Change the list of the other values accordingly. - Sort the flags to "zfs destroy" alphabetically. Reviewed by: rgrimes Approved by: rgrimes MFC after: 8 days Differential Revision: https://reviews.freebsd.org/D18993 Modified: head/usr.bin/fortune/datfiles/freebsd-tips Modified: head/usr.bin/fortune/datfiles/freebsd-tips ============================================================================== --- head/usr.bin/fortune/datfiles/freebsd-tips Mon Jan 28 18:55:29 2019 (r343531) +++ head/usr.bin/fortune/datfiles/freebsd-tips Mon Jan 28 19:54:58 2019 (r343532) @@ -275,7 +275,7 @@ To see how much disk space is left on your UFS partiti df -h -- Dru <genesis@istar.ca> % -To see the 10 largest files on a directory or UFS partition, use +To see the 10 largest files in a directory or on a UFS partition, use du -h /partition_or_directory_name | sort -rh | head -- Dru <genesis@istar.ca> @@ -560,31 +560,38 @@ curl -v -d "nickname=$USER" -d "description=FreeBSD/$( $(kenv smbios.system.maker) $(kenv smbios.system.product)" -d "do=addd" \ --data-urlencode 'dmesg@/var/run/dmesg.boot' http://dmesgd.nycbug.org/index.cgi % -Want to know how much memory (in bytes) your machine has available? Let +Want to know how much memory (in bytes) your machine has installed? Let sysctl(8) tell you with the following command: -sysctl hw.physmem +sysctl hw.realmem +The realmem value is memory before the kernel and modules are loaded, whereas +hw.physmem is what is left after they were loaded. + The number of active CPUs is displayed using this command: sysctl hw.ncpu -- Benedict Reuschling <bcr@FreeBSD.org> % -When using ZFS as the file system the "df" command will display confusing -values. Use the built-in "zfs list" command to get an overview of space usage: +When using ZFS as the file system the "df" command is reporting the pool size +and not file system sizes. It also does not know about descendent ZFS +datasets, snapshots, quotas, and reservations with their individual space usage. +Use the built-in "zfs list" command to get a better overview of space usage: zfs list -o space -- Benedict Reuschling <bcr@FreeBSD.org> % To learn more about what your system is doing, take a look at systat(1). For -example, to get an overview of I/O happening in the system, run: +example, to get various of statistics related to virtual memory usage, process +scheduling, device interrupts, system name translation caching, and disk I/O, +enter the following: -systat -iostat +systat -vmstat -Other values are icmp, icmp6, ifstat, ip, ip6, netstat, pigs, sctp, swap, tcp, -vmstat, or zarc. You can switch between displays using :<display> and exit +Other values are icmp, icmp6, ifstat, iostat, ip, ip6, netstat, pigs, sctp, +swap, tcp, or zarc. You can switch between displays using :<display> and exit back to your shell by typing :quit @@ -694,7 +701,7 @@ dataset/snapshot and not any dependent ones. ZFS will action when -n is combined with the -v option without actually performing it: -zfs destroy -rvn mypool@mysnap +zfs destroy -nrv mypool@mysnap Once you are sure this is exactly what you intend to do, remove the -n parameter to execute the destroy operation.
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