HP-UX 11.31數據庫服務器反應很慢,通過top看交換內存剩餘量很小,所以懷疑交換內存過小問題
home/oracle> swapinfo -s
Primary swap (for next boot) :
Primary swap for next boot was not set using swapctl()
Kb Kb Kb PCT START/ Kb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8388608 4030588 4358020 48% 0 - 1 /dev/vg00/lvol2
reserve - 3595536 -3595536
memory 15892540 6669364 9223176 42%
發現機器內存是16G,但是給定swap內存分配8G,所以決定擴展swap空間。
採用下面這個辦法來擴充,可以簡化
hp[/]#lvcreate -L 8096 -n myswap /dev/vg00
Logical volume "/dev/vg00/myswap" has been successfully created with
character device "/dev/vg00/rmyswap".
Logical volume "/dev/vg00/myswap" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
然後將
/dev/vg00/myswap /myswap swap defaults 0 0
寫進/etc/fstab中,
激活
hp[/etc]#mkdir /myswap
hp[/etc]#swapon -a
現在看交換內存已經添加
hp[/etc]#swapinfo -atm
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8192 1502 6690 18% 0 - 1 /dev/vg00/lvol2
dev 8096 0 8096 0% 0 - 1 /dev/vg00/myswap
reserve - 5159 -5159
memory 15520 4151 11369 27%
total 31808 10812 20996 34% - 0 -
這樣系統就正常了
home/oracle> swapinfo -s
Primary swap (for next boot) :
Primary swap for next boot was not set using swapctl()
Kb Kb Kb PCT START/ Kb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8388608 4030588 4358020 48% 0 - 1 /dev/vg00/lvol2
reserve - 3595536 -3595536
memory 15892540 6669364 9223176 42%
發現機器內存是16G,但是給定swap內存分配8G,所以決定擴展swap空間。
採用下面這個辦法來擴充,可以簡化
hp[/]#lvcreate -L 8096 -n myswap /dev/vg00
Logical volume "/dev/vg00/myswap" has been successfully created with
character device "/dev/vg00/rmyswap".
Logical volume "/dev/vg00/myswap" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
然後將
/dev/vg00/myswap /myswap swap defaults 0 0
寫進/etc/fstab中,
激活
hp[/etc]#mkdir /myswap
hp[/etc]#swapon -a
現在看交換內存已經添加
hp[/etc]#swapinfo -atm
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8192 1502 6690 18% 0 - 1 /dev/vg00/lvol2
dev 8096 0 8096 0% 0 - 1 /dev/vg00/myswap
reserve - 5159 -5159
memory 15520 4151 11369 27%
total 31808 10812 20996 34% - 0 -
這樣系統就正常了