Hi David, I've always been under the impression that the best configuration for Linux/390 guest swap is to make the virtual machine storage as large as it SHOULD need under normal operating conditions, and give the guest practically NO swap. Since Linux wants to "exploit" his memory and swap space as if he were a "stand alone" machine - the intent is to not give him more than he absolutely needs to prevent him from doing "clever things" with it, no?
We have only 2Gig of real storage, so I have to be very tight with regards to VM size and VDISK (which will reduce my DPA if I allow users access to it). In addition to a large traditional VM/CMS workload, we support a minimum of 4 production Linux/390 guests with up to 4 additional running at any time. Response time to all remains excellent (well, except for 'piggy' things like Java on Linux/390 - which we've pretty much given up on). Michael Coffin, VM Systems Programmer Internal Revenue Service - Room 6527 1111 Constitution Avenue, N.W. Washington, D.C. 20224 Voice: (202) 927-4188 FAX: (202) 622-6726 [EMAIL PROTECTED] -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of David Boyes Sent: Thursday, August 12, 2004 1:12 PM To: [EMAIL PROTECTED] Subject: Re: VDSK Swap - allocation size? Rule of thumb I use is start with 2x virtual machine size and add 32M. Watch swap utilization over time, and adjust to 2x avg utilization + 32M based on 10-14 days worth of averages. Continue to adjust as needed. -- db > -----Original Message----- > From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of > James Melin > Sent: Thursday, August 12, 2004 12:37 PM > To: [EMAIL PROTECTED] > Subject: VDSK Swap - allocation size? > > > My VM guy gave me 128,000 1K blocks of VDSK swap. I feel this is > excessive, especial when you take it out to 7 VM guests. I understand > that VM only > uses as much of the allocation as is needed but I was > wondering what most > people are defining this as? ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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
