On 10/5/06, Ihno Krumreich <[EMAIL PROTECTED]> wrote:
To speed up the access to the swap space use multiple disks at the same priority. So to take the above example instead of using one 512 MB disk use four 128 MB disks with the same priority. To see how much I/O is done to the swap space run vmstat and look at the swap coloums.
You seem to miss the point we discuss here. The speed of a virtual disk is determined by the CPU speed. Linux spreading its I/O over multiple vdisks will not make it faster. The benefit of more data in a single I/O is neglectable on virtual disk. What we want to achieve with multiple virtual disks for swap is to avoid fragmentation of the active portion of the swap device. Multiple disks with *different* priority do a nice job there. I am working on a short paper to summarize the "best practices" and help people size their virtual machines and swap space. Watch this space. Rob -- Rob van der Heij Velocity Software, Inc http://velocitysoftware.com/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390