> Hongwei Li wrote: >> >> Yes, it works. Thank you very much! Now, I have questions: >> >> 1. What's the use of mkswap -L SWAP-hda7 /dev/hda7? I don't see any >> effect? > > It *should* be setting the "filesystem label" of the partition to > "SWAP-hda7" so that mkswap can find it by name rather than being needed > to be told where exactly the swap partition is. > >> 2. When I put the original entry back to /etc/fstab as: >> LABEL=SWAP-hda7 swap swap defaults 0 0 >> >> it does not work again. I have to put /dev/hda7 in it. How to let the >> original entry work -- the above mkswap ... does not have effect? > > Was your system swapping to that partition at the time you did the mkswap? > > > Why do we need those LABEL=... in fstab? > > The idea is that labels should be less of a moving target than device > names. For example, lots of people found that their SATA drives moved > from being /dev/hdX to /dev/sdX fairly recently. Labelling filesystems > means that the OS can find them no matter what the device name is. This > isn't without its problems (e.g. when moving disks between machines, > resulting in multiple partitions with the same labels), but that's why > they're there. > > Labels for swap partitions are discussed at: > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=127892 > > Paul. > > -- Here is what I did in the order: # swapoff -a # mkswap -L SWAP-hda7 /dev/hda7 Setting up swapspace version 1, size = 2097410 kB # vi /etc/fstab (set: LABEL=SWAP-hda7 swap swap defaults 0 0 ) # swapon -a swapon: cannot find the device for LABEL=SWAP-hda7 # vi /etc/fstab (set: /dev/hda7 swap swap defaults 0 0 ) # swapon -a # free total used free shared buffers cached Mem: 1035748 216116 819632 0 13096 119504 -/+ buffers/cache: 83516 952232 Swap: 2048248 0 2048248 Should I do it differently? Thanks! Hongwei
