--- swap.1m.orig Thu Feb 23 16:28:52 2006 +++ swap.1m.new Thu Mar 16 16:38:56 2006 @@ -1,330 +1,332 @@ - - - System Administration Commands swap(1M) NAME swap - swap administrative interface SYNOPSIS /usr/sbin/swap -a swapname [swaplow] [swaplen] /usr/sbin/swap -d swapname [swaplow] - /usr/sbin/swap -l + /usr/sbin/swap -l [h | k] - /usr/sbin/swap -s + /usr/sbin/swap -s [-h] DESCRIPTION The swap utility provides a method of adding, deleting, and monitoring the system swap areas used by the memory manager. OPTIONS The following options are supported: -a swapname Add the specified swap area. This option can only be used by the super-user. swapname is the name of the swap file: for example, /dev/dsk/c0t0d0s1 or a regular file. swaplow is the offset in 512-byte blocks into the file where the swap area should begin. swaplen is the desired length of the swap area in 512-byte blocks. The value of swaplen can not be less than 16. For exam- ple, if n blocks are specified, then (n-1) blocks would be the actual swap length. swaplen must be at least one page in length. The size of a page of memory can be deter- mined by using the pagesize command. See pagesize(1). Since the first page of a swap file is automatically skipped, and a swap file needs to be at least one page in length, the minimum size should be a multi- ple of 2 pagesize bytes. The size of a page of memory is machine dependent. swaplow + swaplen must be less than or equal to the size of the swap file. If swaplen is not specified, an area will be added start- ing at swaplow and extending to the end of the designated file. If neither swaplow nor swaplen are specified, the whole file will be used except for the first page. Swap areas are normally added automatically dur- ing system startup by the /sbin/swapadd script. This script adds all swap areas which have been specified in the /etc/vfstab file; for the syntax of these SunOS 5.10 Last change: 20 Jan 2004 1 System Administration Commands swap(1M) specifications, see vfstab(4). To use an NFS or local file-system swapname, you should first create a file using mkfile(1M). A local file-system swap file can now be added to the running system by just running the swap -a command. For NFS mounted swap files, the server needs to export the file. Do this by performing the following steps: 1. Add the following line to /etc/dfs/dfstab: share -F nfs -o rw=clientname,root=clientname path-to-swap-file 2. Run shareall(1M). 3. Have the client add the following line to /etc/vfstab: server:path-to-swap-file - local-path-to-swap-filenfs \ --- local-path-to-swap-file -- swap --- 4. Have the client run mount: # mount local-path-to-swap-file 5. The client can then run swap -a to add the swap space: # swap -a local-path-to-swap-file -d swapname Delete the specified swap area. This option can only be used by the super-user. swapname is the name of the swap file: for example, SunOS 5.10 Last change: 20 Jan 2004 2 System Administration Commands swap(1M) /dev/dsk/c0t0d0s1 or a regular file. swaplow is the offset in 512-byte blocks into the swap area to be deleted. If swaplow is not specified, the area will be deleted starting at the second page. When the command com- pletes, swap blocks can no longer be allo- cated from this area and all swap blocks previously in use in this swap area have been moved to other swap areas. + -h All sizes are scaled to a human readable + format. Scaling is done by repetitively + dividing by 1024. + -k Write the files sizes in units of 1024 + bytes. -l List the status of all the swap areas. The output has five columns: path The path name for the swap area. dev The major/minor device number in decimal if it is a block special device; zeroes otherwise. swaplo The swaplow value for the area in 512-byte blocks. blocks The swaplen value for the area in 512-byte blocks. free The number of 512-byte blocks in this area that are not currently allocated. The list does not include swap space in the form of physical memory because this space is not associated with a particular swap area. If swap -l is run while swapname is in the process of being deleted (by swap -d), the string INDEL will appear in a sixth column of the swap stats. SunOS 5.10 Last change: 20 Jan 2004 3 System Administration Commands swap(1M) -s Print summary information about total swap space usage and availability: allocated The total amount of swap space in bytes currently allocated for use as backing store. reserved The total amount of swap space in bytes not currently allocated, but claimed by memory mappings for possible future use. used The total amount of swap space in bytes that is either allocated or reserved. available The total swap space in bytes that is currently available for future reser- vation and allocation. These numbers include swap space from all configured swap areas as listed by the -l option, as well swap space in the form of physical memory. USAGE On the 32-bit operating system, only the first 2 Gbytes -1 are used for swap devices greater than or equal to 2 Gbytes in size. On the 64-bit operating system, a block device larger than 2 Gbytes can be fully utilized for swap up to 2 **63 -1 bytes. ENVIRONMENT VARIABLES See environ(5) for descriptions of the following environment variables that affect the execution of swap: LC_CTYPE and LC_MESSAGE. SunOS 5.10 Last change: 20 Jan 2004 4 System Administration Commands swap(1M) ATTRIBUTES See attributes(5) for descriptions of the following attri- butes: ____________________________________________________________ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |_____________________________|_____________________________| | Availability | SUNWcsu | |_____________________________|_____________________________| SEE ALSO pagesize(1), mkfile(1M), shareall(1M), getpagesize(3C), vfstab(4), attributes(5), largefile(5) WARNINGS No check is done to determine if a swap area being added overlaps with an existing file system. SunOS 5.10 Last change: 20 Jan 2004 5