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clear swap slice

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Operating Systems Solaris clear swap slice
# 1  
Old 05-21-2011
clear swap slice
is there a command that would zero swap slice? I found these instructions:
Quote:
.As for swap, it skips a few blocks at the beginning, so as not to clobber a label
$ swap -l
swapfile dev swaplo blocks free
/dev/md/dsk/d1 85,1 16 10461104 10461104

Remember that if you ever decide to wipe swap to clean up a machine; something like
# dd if=/dev/zero of=/dev/rdsk/c0t0d0s1

(and bs=whatever, etc) is _not_ a good idea; you need an oseek= or somesuch to skip from the start of the slice to swaplo, or you may clobber your disk label.
but hoping there is some swap-specific command
# 2  
Old 05-22-2011
The disk label is not on the swap area but why do you want to clear your swap anyway ?
This User Gave Thanks to jlliagre For This Post:
orange47
# 3  
Old 05-22-2011
but according to prtvtoc and other commands, swap slice starts with sector 0Smilie Why does Solaris install set swap start at cylinder 0? - comp.unix.solaris | Computer Group ) and label seems to be there, too. so, I skipped first 256Kb, with dd, just to be sure. I want to clear the swap to keep the disk compressed image smaller.
# 4  
Old 05-22-2011
Indeed, the vtoc might be on the swap area first sectors but that really depends on whether you are on x86 or SPARC, whether you are using UFS or ZFS for the root file system, and whether you are using the default slice layout or not.
This User Gave Thanks to jlliagre For This Post:
orange47
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