Date: Sun, 29 Nov 2009 18:23:45 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Pete French <petefrench@ticketswitch.com> Cc: freebsd-stable@freebsd.org Subject: Re: how to get the UFSID of a mounted filesystem ? Message-ID: <20091130002344.GL89004@dan.emsphone.com> In-Reply-To: <E1NEtq7-000Miv-AC@dilbert.ticketswitch.com> References: <E1NEtq7-000Miv-AC@dilbert.ticketswitch.com>
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In the last episode (Nov 30), Pete French said: > I observer that when I mount a UFS filesystem using the device name then > the entry vanishes from /dev/ufsid, and glabel list no longer shows the > device. Which begs the question, how do I find out the ufsid of a mountde > filesystem (e.g. '/' so that I can change it's fstab entry for the next > reboot?) > > Am slightly embarassed to have to ask for help! Am sure this was easy and > in dmesg last time I did this... Easiest way is to run dumpfs on the device you currently have mounted. The fsid will be on the 2nd line of the output: (root@studio) /root># dumpfs /dev/da2s1a | head -2 magic 19540119 (UFS2) time Sun Nov 29 18:19:39 2009 superblock location 65536 id [ 49b21fba 667e8575 ] Next easiest is to run "mount -v" as root, which will give you the fsid, but byte-swapped so you have to mess with it to get a value that matches what glabel expects: /dev/ufsid/49b21fba667e8575 on /tmp/z (ufs, local, soft-updates, fsid ba1fb24975857e66) -- Dan Nelson dnelson@allantgroup.com
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