> Hongwei Li wrote: >> Hi, >> >> I just found that my fc3 system's swap partition is "gone". When I >> installed the system, I set it to 1Gb. The kernel is 2.6.10-1.766_FC3. >> I >> don't know when it started, but here are some information: >> >> # free >> total used free shared buffers >> cached >> Mem: 1035748 658792 376956 0 145380 >> 272540 >> -/+ buffers/cache: 240872 794876 >> Swap: 0 0 0 >> >> # cat /etc/fstab >> >> # This file is edited by fstab-sync - see 'man fstab-sync' for details >> LABEL=/1 / ext3 defaults >> 1 1 >> none /dev/pts devpts gid=5,mode=620 >> 0 0 >> none /dev/shm tmpfs defaults >> 0 0 >> LABEL=/home1 /home ext3 >> defaults,usrquota >> 1 2 >> LABEL=/opt /opt ext3 defaults >> 1 2 >> none /proc proc defaults >> 0 0 >> none /sys sysfs defaults >> 0 0 >> LABEL=/tmp1 /tmp ext3 defaults >> 1 2 >> LABEL=/usr1 /usr ext3 defaults >> 1 2 >> LABEL=/var1 /var ext3 >> defaults,usrquota >> 1 2 >> LABEL=SWAP-hda7 swap swap defaults >> 0 0 >> ... >> >> I tried this: >> >> # swapon -a >> swapon: cannot find the device for LABEL=SWAP-hda7 >> >> The system log does not show anything related to this problem. Can >> somebody tell me what may cause this problem? how to check it further >> and >> fix it? > > Have you booted one of the LiveCD style distributions on this machine? I > have heard that one of them may remove the label from swap partitions. > > You might try changing the fstab entry: > LABEL=SWAP-hda7 swap swap defaults 0 0 > to: > /dev/hda7 swap swap defaults 0 0 > > and see if that works. If it does, you might want to relabel the > partition (when it's not being used), using (I think - the -L option is > undocumented): > > # mkswap -L SWAP-hda7 /dev/hda7 > > Paul. > 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? 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? Why do we need those LABEL=... in fstab? Thanks! Hongwei
