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Full Discussion: No Space Left - Memory/Swap issue
Operating Systems Solaris No Space Left - Memory/Swap issue Post 302497671 by jlliagre on Thursday 17th of February 2011 06:23:19 PM
Old 02-17-2011
Quote:
Originally Posted by bartus11
Well, I didn't hear about using part of physical memory as swap
That depends on what definition of swap you take. When swaps means virtual memory like in the statistics posted, it does.
Quote:
but main rule I learned while working with SunOS is that there should be always a bit more swap than memory available.
Not necessarily. The rule is there must be enough virtual memory for all reservation to fit. The amount of memory needed is not related to the amount of RAM installed but is related to the number of applications and their requirements.

---------- Post updated at 00:23 ---------- Previous update was at 00:19 ----------

Quote:
Originally Posted by aychbee45
That all makes sense, I guess I just would have assumed a vmstat would have shown the system scanning for any unreserved memory to use.

From what I'm seeing, it's like my system has used all the swap it can, all the memory it can and the remaining is reserved. But, at that point I would think it would begin scanning to free memory. That's usually what I would expect.
You are confusing physical and virtual memory. The page scanner (if this is what you are referring to) is there to scan used physical memory in case of demand to page it out. This mechanism has no relationship with virtual memory reservations.
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LEARN ABOUT HPUX

allocate_fs_swapmap

allocate_fs_swapmap(5)						File Formats Manual					    allocate_fs_swapmap(5)

NAME

       allocate_fs_swapmap - determines when swapmap structures are allocated for filesystem swap

VALUES

   Failsafe
   Default
   Allowed values
       or

DESCRIPTION

       The tunable is used to determine whether to allocate all needed filesystem swap structures during the initialization of the filesystem swap
       device or wait until they are needed.  Pre-allocation of all filesystem swap structures upon initialization saves time during  later  usage
       of the filesystem swap, and prevents later allocation failure due to physical memory contention.

       Dynamic allocation decreases the memory footprint of the filesystem swap system.

   Who is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       Systems under heavy memory load may not be able to acquire enough memory to hold the swap mapping structures for an addition of file system
       swap.  These calls to add swap would fail with the error though presumably they would be retried.  Frequent failure  on	file  system  swap
       addition with would merit enabling this tunable.

   What Are the Side Effects of Raising the Value?
       All  the  swap  map structures for each file system swap device would be preallocated during swap initialization at kernel boot, increasing
       the memory footprint of the kernel.  The amount of increase depends on the number and size of file system swap devices.

   When Should the Value of This Tunable Be Lowered?
       Systems with limited memory available to the kernel that also have limited use of file system swap devices should disable this  tunable	to
       decrease kernel memory usage.

   What Are the Side Effects of Lowering the Value?
       File system swap additions may fail with when memory contention is high.

   What Other Tunable Values Should Be Changed at the Same Time?
       None.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       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					    allocate_fs_swapmap(5)
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