On Wed, 2007-10-31 at 11:33 +0100, Swen Schillig wrote: > From: Swen Schillig <[EMAIL PROTECTED]> > > add some statistics provided by the zFCP adapter to the sysfs > > The new zFCP adapter statistics provide a variety of information > about the virtual adapter (subchannel). In order to collect this information > the zFCP driver is extended on one side to query the adapter and > on the other side summarize certain values which can then be fetched on > demand. > This information is made available via files(attributes) in the sysfs > filesystem. > > The information provided by the new zFCP adapter statistics can be fetched > by reading from the following files in the sysfs filesystem > > /sys/class/scsi_host/host<n>/seconds_active > /sys/class/scsi_host/host<n>/requests > /sys/class/scsi_host/host<n>/megabytes > /sys/class/scsi_host/host<n>/utilization
This lot all look like they belong in the FC transport class statistics (some even already exist there). > These are the statistics on a virtual adapter (subchannel) level. > In addition latency information is provided on a SCSI device level (LUN) which > can be found at the following location > > /sys/class/scsi_device/<H:C:T:L>/device/cmd_latency > /sys/class/scsi_device/<H:C:T:L>/device/read_latency > /sys/class/scsi_device/<H:C:T:L>/device/write_latency These look to duplicate to some degree the figures in /sys/block/<dev>/stat. Isn't the block device the best place to gather these, if they're useful? Since user latencies should probably include elevator times. James ---------------------------------------------------------------------- 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
