04-16-2008
Yes - and no.
Paging spaces are used round-robin so they should be all of the same size, this is a thing to observe.
Second, during boot time AIX needs at least one accessible paging space as the system dump is copied there. SAN storage usually is not available during boot, though, so it is a matter of careful planning:
1) Leave at least one paging swapspace on the system disk. Add to that as many swapspaces on SAN devices as you need/want.
2) Make sure that all the swapspaces are of the same size, do NOT create a small swapspace on the system disk and a large ("because there is much more space") swap area on the SAN storage.
For example: If you need 50GB of swapspace and can afford only 5 GB on the system disk then add 9(!) swapspaces of 5GB each on the SAN device instead of one swapspace of 45GB.
I hope this helps.
bakunin
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LEARN ABOUT ULTRIX
swapon
swapon(2) System Calls Manual swapon(2)
Name
swapon - add a swap device for interleaved paging/swapping
Syntax
swapon(special)
char *special;
Description
The system call makes the block device special available to the system for allocation for paging and swapping. The names of potentially
available devices are known to the system and defined at system configuration time. The size of the swap area on special is calculated at
the time the device is first made available for swapping.
Restrictions
There is no way to stop swapping on a disk so that the pack may be dismounted.
Diagnostics
The system call succeeds unless:
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire pathname exceeded 1023 characters.
[ENOENT] The named device does not exist.
[EACCES] Search permission is denied for a component of the path prefix.
[ELOOP] Too many symbolic links were encountered in translating the pathname.
[EPERM] The caller is not the super-user.
[ENOTBLK] The special is not a block device.
[EBUSY] The device specified by special has already been made available for swapping.
[EINVAL] The device configured by special was not configured into the system as a swap device.
[ENXIO] The major device number of special is out of range. (This indicates that no device driver exists for the associated hard-
ware.)
[EIO] An I/O error occurred while opening the swap device.
[EFAULT] The special points outside the process's allocated address space.
See Also
config(8), swapon(8)
swapon(2)