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opensolaris - increase swap

Mon, 26 Jul 2010 00:00:00 +1200

I found this on opensolaris forums…. A nice way to increase your swap without the need for a reboot.

First check your current swap size and details;

swap -lh

zfs list

Then create a temp swap zfs store and delete and increase swap

zfs create -V rpool/swp

swap -a /dev/zvol/dsk/rpool/swp

swap -d /dev/zvol/dsk/rpool/swap

zfs destroy rpool/swap

zfs create -V rpool/swap

swap -a /dev/zvol/dsk/rpool/swap

swap -d /dev/zvol/dsk/rpool/swp

zfs destroy rpool/swp

zfs - now has dedup!

Mon, 05 Apr 2010 00:00:00 +1200

Cool. zfs as of version 21 has deduplication built in. And thats the good dedup - synchronous dedup. i.e. deduped on the fly!

How easy is it to turn on? - very!

Once you have upgraded your zpool to 21 or above you can run the following command at the pool level and deduplication will be over all your data from that point onwards.

zpool set dedup=on tank

Done

Note : Watch your performance, it will drop like a rock if you do not have enough ram for your dedup tables. Do some tests after enabling this feature.

Opensolaris - where has my memory gone?

Sat, 28 Mar 2009 00:00:00 +1300

Use this command in 2008.11 to get details on where your memory is currently being used…

echo ::memstat | pfexec mdb -k

Page Summary Pages MB %Tot ———— —————- —————- —- Kernel 263992 1031 34% ZFS File Data 91917 359 12% Anon 376867 1472 48% Exec and libs 11484 44 1% Page cache 3387 13 0% Free (cachelist) 9766 38 1% Free (freelist) 24807 96 3%

Total 782220 3055 Physical 782219 3055