Memory resident filesystem.

[Carl_102]

Hello,

I want to create a purely memory resident file system. I am doing some test which hits disk I/O hard and i want to create a 1GB memory filesystem on a 8GB box running HP-UX B.11.11 inorder to stress the CPU more.

Forgive me if this is a stupid question but i cant find any relevant info either on the web or the man pages.

Thanks.

[Bill Hassell · Accepted solution]

There is an unsupported ramdisk device file but it was designed for small filesystems (a few dozen megs). There are a number of ramdisk boxes that connect via SCSI that offer sub-millisecond access times. High end disk arrays offer large cache sizes (multiple Gb) which (after first reading all the data once) will return that same data from cache and avoid disk I/O.

[Vincent Fleming]

There are Fibre Channel SSD's (Solid State Disks) also... see these guys for an example of a good one:

http://www.superssd.com/default.asp

I can't recommend any particular vendor, however.

These devices can significantly improve your system's throughput, but can be very expensive.

Typically, they are deployed for your redo logs and such, rather than for dataspaces.

Good luck,

Vince