Date: Thu, 12 Nov 1998 11:38:36 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: "Kenneth D. Merry" <ken@plutotech.com> Cc: aron@cs.rice.edu (Mohit Aron), freebsd-hackers@FreeBSD.ORG Subject: Re: scsi disk queue Message-ID: <199811121938.LAA28728@apollo.backplane.com> References: <199811120550.WAA21345@panzer.plutotech.com>
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Neat! I hope you don't mind if I modify the program some.
http://www.backplane.com/FreeBSD/dds.c
For ongoing reporting of read activity, write activity (avg per second),
busy percentage, and request backlog.
The busy percentage is especially useful.
% ./dds da1 da2 da3 10
nntp1:/news> ./dds da1 da2 da3 10
da1 da2 da3
625k 142k 75%/0 644k 155k 70%/2 652k 137k 72%/1
763k 78.6k 77%/2 792k 96.9k 80%/3 840k 86.4k 80%/2
696k 153k 77%/3 693k 172k 83%/2 702k 163k 80%/4
752k 117k 80%/2 802k 144k 85%/0 839k 104k 88%/2
609k 458k 85%/0 660k 467k 87%/2 622k 449k 87%/2
601k 354k 77%/9 583k 365k 79%/2 597k 341k 79%/6
666k 240k 86%/10 665k 227k 79%/4 680k 240k 88%/7
652k 298k 82%/2 580k 326k 80%/4 619k 290k 79%/3
606k 190k 73%/15 609k 184k 70%/19 652k 188k 82%/16
664k 381k 83%/15 640k 360k 83%/18 656k 383k 76%/16
589k 365k 80%/3 655k 368k 82%/2 601k 343k 90%/1
793k 267k 86%/3 792k 268k 82%/3 818k 286k 90%/0
:If you're running 3.0 or a CAM version of -current or -stable, you can find
:out the number of outstanding transactions for any device registered with
:the devstat(9) subsystem.
:
:Download the following program:
:
:ftp://ftp.kdm.org/pub/FreeBSD/cam/ds.c
:
:It dumps out the devstat entry for each device. The devstat entry includes
:a busy count, which is the number of outstanding transactions queued to the
:drive.
:
:Ken
:--
:Kenneth Merry
:ken@plutotech.com
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