Oh, vendor can matter very much indeed. Search the archives for my experience on the EMC DMX2000 with 4k block sizes on the VM list. Do you have anything else you can test on?
Marcy Cortes This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation." -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Richard Troth Sent: Thursday, August 17, 2006 10:03 To: [email protected] Subject: Re: [LINUX-390] I/O wait times -vs- Linux memory 3390 Vendor should not matter; these are on an EMC frame. What would bog Linux I/O to 3390s? -- R; ----- Original Message ----- From: Dave Jones [EMAIL PROTECTED] Sent: 08/17/2006 12:24 PM To: [email protected] Subject: Re: I/O wait times -vs- Linux memory Rick, what kind of Linux i/o are you doing? To real 3390s? To SHARKs looking like a 3390? To some sort of SCSI attached disk? DJ Richard Troth wrote: > We're looking at some high I/O wait times for a certain database. One > engineer has suggested that we add memory to Linux to speed things up. I > don't see it. Does adding RAM to Linux help its I/O throughput? > > We've put a lot of effort into sizing our Linux guests (all hosted by > z/VM 5.2) to that magical point between guest-level paging and excess > guest memory use, so some of us resist the thought of adding > real-to-Linux memory. I seems obvious that adding RAM would let any > access method do more buffering, but we want to avoid some of that > buffering because Linux gets carried away with it, correct? > > Thoughts? Thanks! > > -- R; > > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
