Solaris

trash ~= wipe

While as MadeInGermany already rightly stated, the swap command will ignore the fact a file system is present on the raw partition, I would nevertheless recommend to wipe the file system, at least enough for it not to be recognized as such, for example with:

Code:

dd if=/dev/zero of=/dev/xxx bs=128k count=10

With /dev/xxx being the actual device storing the old file system (beware about mistake here!)

Hi Jilliagre,

Sorry for the late reply and thank you for your advice !
I have already change the swap disk to the partition.

Can I still do a dd to it ?
dd if=/dev/zero of=/dev/md/dsk/50 bs=128k count=10

Regards,
Noob

To be 100% sure there is no risk, you should temporarily remove it as a swap device before wiping it.

Code:

swap -d /dev/md/dsk/50 && { dd if=/dev/zero of=/dev/md/dsk/50 bs=128k count=10 ; swap -a /dev/md/dsk/50 ; }

The key thing here is that if you created a UFS filesystem, mounted it, maybe put some files in it, maybe removed some or all of those files, and then decide to use that partition as swap space; you MUST unmount that UFS filesystem before declaring that partition to be swap space. And, after telling the OS it can use that partition as swap space, you MUST assume that that partition can never be mounted as a filesystem again until you tell the OS it can no longer use that partition as swap space AND you use something like newfs to create a new filesystem on that partition before you mount it as a filesystem again.