01-06-2008
You will crash and burn if you lose the unmirrored swap area. The idea of mirroring is mostly to survive the loss of a disk with no impact or maybe just a performance hit. Rerun your test using enough vm to ultilize swap.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
When i re-updated my system i set my swap at 500 MB. I have 256 in ram and have never even gone into the 250 mb of swap that i had originally configured. How do I reduce the swap? (3 Replies)
Discussion started by: macdonto
3 Replies
2. UNIX for Dummies Questions & Answers
Is it really so that if swap will be located in the begining of hard drive, than it will work faster? (1 Reply)
Discussion started by: Ty3
1 Replies
3. AIX
Good morning
I have a problem with a partition (P570). A user's process take all the memory, and the swap. So the partition shutdown.
How can I limit a process to not take all the swap ?
(4 Go of memroy, 1 Go of swap)
thank you (2 Replies)
Discussion started by: pascalbout
2 Replies
4. Solaris
When i try to type swap -l ,nothing come out but blinking.
May i know what is the problem and solutions ?
thanks (6 Replies)
Discussion started by: Farbegas
6 Replies
5. HP-UX
I have a HP-UX B.11.23 server with 16 gb of memory 84 gb of swap configured. I am being pushed to define more swap to try and get more Tuxedo domains to start. At what point do we have too much swap for the amount of memory? Thanks in advance. (11 Replies)
Discussion started by: scotbuff
11 Replies
6. Red Hat
free -m : 1023 total swap space
created default partition /dev/sdb1 50M using fdisk. i did write the changes.
#mkswap /dev/sdb1
#swapon /dev/sdb1
free -m : 1078 total swap space
this shows that the swap is on
Question : i did not change the type LINUX SWAP (82) in fdisk.
so why is... (5 Replies)
Discussion started by: dplinux
5 Replies
7. HP-UX
Hi
I have an integrity machine rx7620 and rx8640 running hp-ux 11.31. I'm planning to fine tune the system:
- I would like to know when does the memory swap space spill over to the device swap space?
- And how much % of memory swap utilization should be specified (swap space device... (6 Replies)
Discussion started by: lamoul
6 Replies
8. Red Hat
Hi,
I have added a new disk to production server. How to make it visible to os and how to configure it. I also want to add some space from that disk to swap space. Please help me out. (1 Reply)
Discussion started by: chetansingh23
1 Replies
9. Solaris
Hi,
Can somebody please help here, since iam just a beginner.
According to my book knowledge.
the Avalilable memory calculated by swap -l (includes only swap) should be small as compared to swap -s value(includes Virtual memory=swap +physical).
but this is quite opposite in my case.
swap... (6 Replies)
Discussion started by: Laxxi
6 Replies
10. Solaris
Hi Solaris Folks :),
I need to calculate the swap usage on solaris server, please let me understand the output of below swap -s and swap -l commands.
$swap -s
total: 1774912k bytes allocated + 240616k reserved = 2015528k used, 14542512k available
$swap -l
swapfile dev swaplo... (6 Replies)
Discussion started by: seenuvasan1985
6 Replies
LEARN ABOUT HPUX
swapmem_on
swapmem_on(5) OBSOLETE swapmem_on(5)
NAME
swapmem_on - OBSOLETE kernel tunable parameter
DESCRIPTION
The tunable is obsolete. Processes will always be allowed to use pseudo-swap space if it is available.
In previous versions of HP-UX, system configuration required sufficient physical swap space for the maximum possible number of processes on
the system. This is because HP-UX reserves swap space for a process when it is created, to ensure that a running process never needs to be
killed due to insufficient swap.
This was difficult, however, for systems needing gigabytes of swap space with gigabytes of physical memory, and those with workloads where
the entire load would always be in core. This tunable was created to allow system swap space to be less than core memory. To accomplish
this, a portion of physical memory is set aside as "pseudo-swap" space. While actual swap space is still available, processes still
reserve all the swap they will need at fork or execute time from the physical device or file system swap. Once this swap is completely
used, new processes do not reserve swap, and each page which would have been swapped to the physical device or file system is instead
locked in memory and counted as part of the pseudo-swap space.
WARNINGS
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun-
able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was
factory installed on your system, see at
AUTHOR
was developed by HP.
Tunable Kernel Parameters swapmem_on(5)