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Full Discussion: How can I create a new swap location in ZFS?
Operating Systems Solaris How can I create a new swap location in ZFS? Post 302277342 by jlliagre on Friday 16th of January 2009 03:45:37 AM
Old 01-16-2009
Quote:
Originally Posted by sqa777
I am running OpenSolaris v5.11

During installation, the installation created default ZFS filesystems, like the dump and swap locations.
I want to change the blocksize of the /dump and /swap locations
Why ? What do you expect with changing the dump and swap blocksizes ?
Quote:
and make them ZFS volumes.
They are already ZFS volumes, not filesystems.
Quote:
I was able to do a zfs destroy on /rpool/dump and then create another dump location with the proper options:
zfs create -b 131072 -V 1024m rpool/dump
I bet it was initially created with the same options. What says
"zpool history -il | grep dump" ?
Quote:
I cannot destroy /rpool/swap though. It tells me that the ...dataset is busy. I did some investigating and found that I have to do a dumpadm
Your investigation failed, dumpadm has no relationship with the swap, especially when on ZFS.
Quote:
but that doesn't work either:


>dumpadm -d swap
dumpadm: no swap devices could be configured as the dump device

>swap -l
swapfile dev swaplo blocks free
/dev/zvol/dsk/rpool/swap 182,1 8 16775160 16775160

How can I destroy the /rpool/swap directory and then create another swap directory and make it a volume with a particular blocksize? Do I rename the swap location to something else?
You don't remove swap with the dumpadm command but with the swap one:
Code:
swap -d /dev/zvol/dsk/rpool/swap

 

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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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