NonStop S-Series Hardware Installation and FastPath Guide (G06.29+)

Online Configuration Tasks
HP NonStop S-Series Hardware Installation and FastPath Guide—541880-002
12-11
1. Choose the Target Disk and Plan Its Space and
Files
1. Choose the Target Disk and Plan Its Space and Files
The target disk is the disk that will become the alternate system disk. Before choosing
the target disk, plan its space and the files that will be stored on it.
Ensure that this target disk has enough room for the subvolumes it will hold. The best
way to do this is to set aside an entire disk as the target disk. If you cannot set aside
an entire disk, you might need to purge files from the disk you will use.
Plan your alternate system disk using the following considerations:
•
Allow enough space on the target disk for the Kernel-Managed Swap Facility
(KMSF) to operate.
•
Ensure that all the files that will remain on the target disk can still be accessed
when it is used as an alternate system disk. For example, you cannot have audited
files on the alternate system disk if your TMF audit trails also are located on that
disk.
•
Ensure that your startup files, such as the CIIN file, refer to $SYSTEM.
Note. The default KMSF swap files immediately allocate 64 megabytes of swap space
and can grow to a maximum size of 128 megabytes. However, the Kernel-Managed Swap
Facility (KMSF) Manual recommends that you initially configure a swap file of 512
megabytes for each processor. Because the optimal amount of swap space varies, you
should adjust the size of the swap files depending on system use and workflow patterns.
As much as 2 gigabytes could be required for a processor with 1 gigabyte of memory.
HP recommends configuring KMSF swap files instead of using the default KMSF swap
files because many processes require more swap space than is provided by default swap
files. Insufficient swap space can result in errors, process failures, and processor halts.