MemFS 1.0 - A Memory-based File System on HP-UX 11i v3

Figure 5. SDET Benchmark results

Configuration Guidelines

A MemFS instance can be created using mount(1m) command,

mount [-F memfs]

[-o [remount]]

[-o [size=value]]

[-o [ninode=value]]

[-o suid|nosuid] directory

For example, to mount a file system with maximum space 100MB and maximum number of

inodes as 1000 on /memfs

mount –F memfs –o size=100M,ninode=1000 /memfs

To remove the restriction on the file system size on the above file systems,

mount –F memfs –o remount,size=0 /memfs

As mentioned earlier, the amount of free space on the file system depends on the free swap space

at that instant. memfs_swapmax_pct(5) tunable can be used to increase the swap space available

for MemFS. 0-80% of the swap space can be specified for MemFS usage. This tunable will just

specify the maximum percentage of swap space MemFS can use but this will not reserve the

space for MemFS and assures the space for MemFS. In case the MemFS has exhausted the space

available for it, ENOSPC will be returned to the application and following message will be

displayed on the console.

memfs: Cumulative data exceeds memfs_swapmax_pct