How to remount UNIX filesystems with one command

How to remount UNIX filesystems with one command

Unix Filesystems missing after reboot ?

After reboot filesystems could not be mounted from various reasons (auto mount = off, errors in superblock, problems with volume groups, etc). Working with with filesystems that reside on Storate Are Networks or with Network Attached Storage or with large ammounts of filesystems / mountpoints can be difficult some times.

After rebooting a server filesystems could not be mounted from various reasons (auto mount = off, errors in superblock, problems with volume groups, etc). Working with filesystems on Storate Are Networks or with Network Attached Storage or with large ammounts of filesystems/mountpoints can be difficult some times, especially when you have ~50-60 filesystem mounted and 2-3 missing :)

Today, while working on an AIX server I found my self in the situation in which, after reboot, there were very few filesystems mounted, around 15-16 compared to ~ 42 that were mounted before I had rebooted the server (the cause is irrelevant).

root@server:/home/root/before #df -k
Filesystem 1024-blocks Free %Used Iused %Iused Mounted on
/dev/hd4 131072 69180 48% 3409 18% /
/dev/hd2 3538944 1422408 60% 39009 11% /usr
/dev/hd9var 524288 273736 48% 2558 4% /var
/dev/hd3 884736 790332 11% 1061 1% /tmp
/dev/hd1 163840 57520 65% 607 5% /home
/proc - - - - - /proc
/dev/hd10opt 131072 19200 86% 2386 34% /opt
/dev/lvtsm 32768 27672 16% 35 1% /var/tsm
/dev/lvesm 262144 121320 54% 156 1% /usr/esm
/dev/lvtivoli 294912 135180 55% 983 4% /opt/Tivoli
/dev/lvexploit 294912 6216 98% 220 13% /exploit
/dev/lvaudit 65536 65060 1% 8 1% /audit
/dev/lvmqmclient 131072 130672 1% 25 1% /var/mqm
/dev/lvcd 10518528 1071256 90% 3110 2% /SAPCD
/dev/lvoracle 1048576 734400 30% 657 1% /oracle

Luckily for me, before reboot I do the "before" commands, as I like to call them:

So I go into ~/before directory and issue the following command that will automatically remount all filesystems from before reboot :

root@server:/home/root/# for i in $(cat df-k | tail +2 | awk '{print $NF}'); do df -k | grep -w "$i" >/dev/null; if [[ $? != "0" ]]; then echo "Mounting $i ............."; mount $i; echo "Done"; fi; done
Mounting /oracle/DB1 .............
Done

Of course, from this command you can also create a script to remount all filesystems that were mounted before the reboot.

This command is applicable on FreeBSD, Linux and AIX and other Unix operating systems.

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