swap partition missing?

[Paul Howarth]

Hongwei Li wrote:
>>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

I just tried this on my own FC3 box and it worked. Is this the only swap 
partition in use on your machine?

Paul.