The difference is mostly because Solaris also uses free memory as a virtual swap device, and you have quite a lot of free memory.
As free memory is consumed, your configured swap devices will be used as a secondary preference. You also need to understand the difference between reserved, allocated and used swap space. The command 'swap -s' is very useful for seeing this, and you'll find explanations in the docs. Also, make sure you are not using the DISM feature with Oracle. And remember, you don't actually ever want tobe swapping for real. Hope that helps. If you need more help you could always hire an experienced consultant ;) Phil www.harmanholistix.com On 1 Dec 2010, at 12:19, Ketan <vibhu...@gmail.com> wrote: > One of our system is running 3 oracle db instances. And as per prstat o/p the > system is approximately using 78G of swap memory > > > ********************************************************************************************** > # prstat -J -n 2,15 > > PROJID NPROC SWAP RSS MEMORY TIME CPU PROJECT > 4038 557 31G 29G 22% 113:23:43 10% proj1 > 4036 466 20G 19G 15% 2359:46:4 7.6% proj2 > 4023 452 25G 17G 13% 67:33:14 5.8% proj3 > 3 44 221M 226M 0.2% 105:55:41 1.0% default > 0 141 859M 543M 0.4% 801:01:21 0.3% system > 1 18 333M 329M 0.3% 6:41:31 0.0% user.root > > but vmstat, swap -l shows approximately 115G free swap out of total 123G > configured swap (zfs o/p) > > > > > swapfile dev swaplo blocks free > /dev/zvol/dsk/rpool/swap 256,1 16 4194288 849952 > /dev/zvol/dsk/swappool/swap1 256,3 16 251658224 > > > vmstat -S 1 3 > kthr memory page disk faults cpu > r b w swap free si so pi po fr de sr lf s0 s1 s2 in sy cs us sy id > 0 6 0 109555680 13515096 0 0 5119 16 21 0 8 0 0 0 0 26340 160046 36768 17 7 > 76 > 0 1 0 120233928 25672592 0 0 3992 0 0 0 0 0 0 0 0 15273 78922 15473 17 3 > 80 > 1 0 0 120220304 25661568 0 0 24 0 0 0 0 0 0 0 0 14509 66103 14879 19 2 > 79 > 0 1 0 120215496 25656360 0 0 39 0 0 0 0 0 0 0 0 17999 76188 20237 20 3 > 77 > > > rpool/swap 2.03G 76.6G 2.03G - > swappool 120G 13.9G 18K /swappool > why there is difference in figures of swap in o/p of prstat and vmstat& swap > -l > -- > This message posted from opensolaris.org > _______________________________________________ > perf-discuss mailing list > perf-discuss@opensolaris.org _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
