Sun StorageTek Availability Suite 4.0 Point-in-Time Copy Software Administration Guide
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dsstat and Storage Cache Statistics
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This appendix describes the operation of the dsstat utility. The dsstat utility collects and reports I/O statistics for the Sun StorageTek Availability Suite software components.
The /usr/sbin/dsstat command displays I/O statistics for the Remote Mirror, Point-in-Time Copy, and Cache software. See the dsstat man page for more information.
Unless you specify otherwise, all fields displayed show per-second averages based on the data collected during the interval. For example, if you specify 5-second intervals, the data displayed is a per-second average of the data collected during the last 5-second interval.
Syntax
dsstat -m mode [-r report-options][-d display-options][-s volume-sets] [-f |-F]
[-z] [interval [count]]
See TABLE A-1 for the command options.
TABLE A-1 dsstat Options
Option
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Description
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-m mode
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Specifies the statistics reporting mode, where mode is one of the following:
This option determines the options you can use with the
-r report-option. You cannot use the -r report-option if you specify
-m cache.
If -m is not specified, the default is for the statistics for all modes to be displayed.
You can enter a comma-separated list of modes as well as multiple -m switches. The following commands are equivalent:
# dsstat -m sndr,ii
# dsstat -m sndr -m ii
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-r report-options
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No report-options are available for the -m cache mode.
If you specify -m ii, you can use this option as follows. If you do not specify -r report-options, the default display is -r msbo.
- -r m shows master volume information.
- -r s shows shadow volume information.
- -r b shows bitmap volume information.
- -r o shows overflow volume information (if this volume type is attached).
If you specify -m sndr, you can use this option as follows. If you do not specify -r report-options, the default display is -r bn.
- -r b shows bitmap volume information (this command shows only the bitmap of the host you are issuing the command from).
- -r n shows network volume information.
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-d display-options
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Specifies the types of information to show. You can specify one or more of the following options on the command line. (If you specify -d t, the r and w options are ignored.)
If you specify -m cache, the available options are as follows. If you do not specify this option, the default display is -d sf.
- -d r shows detailed read information.
- -d w shows detailed write information.
- -d d shows destaged data information.
- -d c shows cancelled write information.
- -d s shows summary of information.
- -d f shows cache behavior flags.
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If you specify -m sndr or -m ii, the available options are as follows. If you do not specify this option, the default display for -m ii is -d sf and for -m sndr is -d spf.
- -d r shows detailed read information.
- -d w shows detailed write information.
- -d t shows timing information.
- -d s shows summary of information.
- -d f shows volume type and status flags.
- -d p shows (-m sndr only) percentage of volume requiring a synchronization.
- -d a shows (-m sndr only) shows the secondary volume names.
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-s volume-set
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Shows information about the specified volume-set only. volume-set can also be a comma-delimited list of volume names.
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-f
-F
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Displays a field header for every report cycle.
Displays a field header once, when reporting begins.
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-z
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Does not report or display lines that have a value of zero (indicates no activity).
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interval [count]
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Specifies how often the report is updated. The default interval is one second.
count specifies how many reports to display. If count is not specified, report output continues at the specified interval time until you interrupt it by a break (^C).
If you do not specify interval and count, the command shows a single report for a one second interval.
Unless you specify otherwise, all fields displayed show per second averages based on the data collected during the interval. For example, if you specify 5-second intervals, the data displayed is a per-second average of the data collected during the last 5-second interval.
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Examples
TABLE A-2 describes the fields displayed.
Report Cache Statistics
- Report cache statistics (dsstat -m cache)
- Show detailed information for read and write statistics (-d rw)
- Show information for the volume c1t35d0s6 (-s /dev/rdsk/c1t35d0s6)
- Generate reports at five-second intervals (5)
Note - Only the trailing sixteen characters of a volume name appear in a report. For example: /dev/rdsk/c1t1d0s0 is displayed as ev/rdsk/c1t1d0s0.
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# dsstat -m cache -d rw -s /dev/rdsk/c1t1d0s0 5
- read - - write -
volume ckps dkps hit ckps dkps hit
ev/rdsk/c1t1d0s0 0 0 0.00 0 0 0.00
ev/rdsk/c1t1d0s0 3 2396 0.13 983 763 100.00
ev/rdsk/c1t1d0s0 2399 799 75.00 2815 2686 100.00
ev/rdsk/c1t1d0s0 3200 800 80.00 2755 2908 100.00
ev/rdsk/c1t1d0s0 3999 799 83.33 2809 2868 100.00
ev/rdsk/c1t1d0s0 4800 800 85.71 2867 2931 100.00
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Report Master and Shadow Volume Point-in-Time Copy Software Statistics
- Report master and shadow volume Point-in-Time Copy software statistics
(dsstat -m ii -r ms)
- Generate reports at five-second intervals (5).
# dsstat -m ii -r ms 5
- master - - shadow -
set name t s kps tps svt kps tps svt
ev/rdsk/c0t1d0s0 I - 0 0 0 0 0 0
ev/rdsk/c0t1d0s0 I - 9047 219 3 9040 219 7
ev/rdsk/c0t1d0s0 I - 13548 317 3 9760 243 6
ev/rdsk/c0t1d0s0 I - 5946 155 3 9684 227 8
ev/rdsk/c0t1d0s0 I - 16539 417 2 9242 225 7
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Report Network Statistics for the Remote Mirror Software
- Reports network statistics for the Remote Mirror software (-m sndr, -r n)
- Shows information for the secondary volume c1t35d0s6
(-s /dev/rdsk/c1t35d0s6)
- Shows detailed information for read and write statistics, timing, and volume type or status flags (-d rwtf)
- Generates reports at five-second intervals (5)
# dsstat -m sndr -r n -d rwtpf -s /dev/rdsk/c1t1d0s0 5
- network -
set name t s sn rkps rtps wkps wtps svt
ev/rdsk/c1t1d0s0 P L 77.27 0 0 0 0 0
ev/rdsk/c1t1d0s0 P SY 75.07 0 0 2317 72 11
ev/rdsk/c1t1d0s0 P SY 71.67 0 0 3443 108 9
ev/rdsk/c1t1d0s0 P SY 69.37 0 0 2426 76 12
ev/rdsk/c1t1d0s0 P SY 66.68 0 0 2765 86 11
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TABLE A-2 dsstat Display Fields
Field
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Description
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set name
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Volume set specified by -s option
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t
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Volume type for remote mirror volumes:
P primary host volume
S secondary host volume
Volume type for the point-in-time copy volumes:
I independent shadow volume set
D dependent shadow volume set
Valid cache modes:
C cache reads and writes
D disk reads and writes
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s
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Volume status for the Remote Mirror software:
L volume is in logging mode; changes are being logged
R replicating changes to secondary
SY forward synchronization is in progress
RS reverse synchronization is in progress
SN forward synchronization needed
RN reverse synchronization needed
VF volume failed
BF bitmap failed
Volume status for the point-in-time copy volumes:
C copy in progress
- no copy in progress
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sn
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Percentage of volume requiring sync
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rtps
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Number of reads
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rkps
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Kilobytes read
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wtps
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Number of writes
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wkps
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Kilobytes written
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svt
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Service time per operation
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tps
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Sum of rtps and wtps
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kps
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Sum of rkps and wkps
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r
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Cache read behavior
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w
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Cache write behavior
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ckps
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Kilobytes read from cache
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dkps
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Kilobytes read from disk
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hit
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Read hits during interval
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ds/s
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Kilobytes destaged from cache
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cn/s
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Number of write cancellations
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Sun StorageTek Availability Suite 4.0 Point-in-Time Copy Software Administration Guide
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819-6149-10
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Copyright © 2006, Sun Microsystems, Inc. All Rights Reserved.