From: Zanwar.Prashant@uktransco.com
Date: Fri Sep 13 2002 - 04:52:17 EDT
Hi,
Thanks to all who replied. Answer of Simon Millard, I received very
first and is most appropriate one. Special thanks to Simon who helped
in time.
Others who replied are:
Casper dik
Amit mahajan
Kumar Prem S.
Michael Schulte
Mathew Stier
AWM
Many thanks to you all. My purpose got served by Simons mail.
Hers is his answer:
If I remember correctly, the size of tmpfs is defined by the amount of
swap. If you have no controls on tmpfs, then you could run out of
swap
space - I have actually seen this.
If you want to ensure that you don't run out of swap by filling tmp,
you
can set a limit in /etc/vfstab by using size=150m in the options.
This
sets the max size of tmp to 150mb.
So in a nutshell, tmpfs uses the same storage as swap so it can go up
or
down. By setting a limit in /etc/vfstab, you restrict the maximum
size
of /tmp so that it doesn't grab all of the swap if it fills up.
I hope this helps.
Simon
P.s. tell the client it technical and that it is the correct behaviour
for Solaris.
Cheers
Prashant Zanwar
Hi all,
Here I got the question. Little tough, about swap usage and /tmp file
system. I request all to reply immediate.
I got Sun - Cluster installed on the system. This is having following
configuration,
####################
# swap -l
swapfile dev swaplo blocks free
/dev/vx/dsk/swapvol1 133,8 16 2049824 1278928
#########################
# grep -i swap /etc/vfstab
/dev/vx/dsk/swapvol1 - - swap - no -
swap - /tmp tmpfs - yes -
#NOTE: volume swapvol (swap) encapsulated partition c0t0d0s1
/dev/vx/dsk/rootdg/swapvol /dev/vx/rdsk/rootdg/swapvol
/var/tmp ufs 3 yes -
##################
# swap -s
total: 928264k bytes allocated + 224880k reserved = 1153144k used,
621440k available
############################
# df -k /tmp
Filesystem kbytes used avail capacity Mounted on
swap 633888 2064 631824 1% /tmp
# df -k /tmp
Filesystem kbytes used avail capacity Mounted on
swap 633240 2064 631176 1% /tmp
# df -k /tmp
Filesystem kbytes used avail capacity Mounted on
swap 634688 2064 632624 1% /tmp
I can understand, if the values in the swap -s change, like all
values may change, as its virtually allocated, and memory is also
involved, which is freed and used as per the requirement.
My question is I am seeing that, /tmp also varies, which is quite
unanswering for me to the customer, who found this.
And can somebody tell me that, what exaclty I shall do to find out,
swap used by system and thus by users. Please clarify. Please
immediate.
I will summerize,
cheers
regards
Prashant Zanwar
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