No SAN in this case, Dave. This is "high I/O wait times" for CKD as minidisks.
-- R; David Boyes <[EMAIL PROTECTED]> Sent by: Linux on 390 Port <[email protected]> 08/17/2006 10:23 AM Please respond to Linux on 390 Port <[email protected]> From David Boyes <[EMAIL PROTECTED]> To [email protected] cc Subject Re: I/O wait times -vs- Linux memory > 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? On Intel, maybe. I would doubt that it would have a large impact on Z. Can you tell how much space the QDIO buffer allocation is taking up? Increasing that allocation may be worth considering, since the SCSI code takes advantage of QDIO if possible. What does the SAN fabric report on link utilization, and is the link configured for multipathing? David Boyes Sine Nomine Associates ---------------------------------------------------------------------- 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
