dsstat(1M) System Administration Commands dsstat(1M)NAMEdsstat - report Sun StorageTek Availability Suite I/O statistics
SYNOPSISdsstat-m mode [-r report-options] [-d display-options]
[-s volume-sets] [-f | -F] [-z] [interval [count]]
DESCRIPTION
The dsstat command collects and reports I/O statistics for the Sun
StorageTek Availability Suite products.
OPTIONS
The dsstat supports the following options:
-m mode
Specifies the mode(s) of operation. Valid modes are:
cache
Cache statistics
ii
Point-in-Time Copy statistics
sndr
Remote Mirror statistics
To display statistics for multiple services simultaneously, use the
-m switch to specify each of the modes required. For example:
% dsstat-m ii -m sndr
% dsstat-m ii -m sndr -m cache
To determine which statistics are being reported from which ser‐
vice, use the role field, described below. When cache statistics
are requested as one of the multiple services, the rkps and wkps
statistics is further divided into crkps, drkps, cwkps, and dwkps.
If no -m switch is specified, then dsstat displays default statis‐
tics for all of the valid modes as described above. See "Field
Descriptions," below for descriptions of these fields.
-r report-options
Specifies the volume components to be displayed. Each item is rep‐
resented by a single character, and multiple items can be selected.
The report-options vary based on the mode(s) specified above. This
option is not used for cache mode.
Valid report-options for ii mode are:
m Master volume statistics.
o For the "report-options for ii mode": m, s,
b, o
o For the "report-options for sndr mode": b,
n
o For the "display-options for cache mode":
r, w, d, c, s, f
o For the "display-options for ii mode": r,
w, t, s, p, f
s Shadow volume statistics.
b Bitmap volume statistics.
o Overflow volume statistics, if attached.
Valid report-options for sndr mode are:
b Bitmap volume statistics.
n Network volume statistics.
-d display-options
Specifies the statistics to be displayed. The types of statistics
are represented by a single character; multiple types can be speci‐
fied.
For cache mode, the valid display-options are:
r Detailed read statistics.
w Detailed write statistics.
s Summary statistics.
f Cache behavior flags.
The following display-options are available only for cache mode,
they need to be combined with the mode options (-m)
d Destaged data statistics.
c Write cancellation statistics.
The default display-options for cache are sf.
For ii mode, the valid display-options are:
r
Detailed read statistics.
w
Detailed write statistics.
t
Timing statistics.
s
Summary statistics.
p
Percentage of volume requiring sync.
f
Volume type/status flags.
The default display-options for ii are spf. For sndr mode, the
valid display-options are:
r Detailed read statistics.
w Detailed write statistics.
t Timing statistics.
s Summary statistics.
p Percentage of volume requiring sync.
f Volume type/status flags.
q Asynchronous queue statistics.
The following display-option is only available for sndr mode, and
needs to be combined with the mode options (-m).
q Asynchronous queue statistics.
The default display-options for sndr are spf.
Specifying the summary display-option causes r w t display-options
to be ignored.
-s volume-sets Filters the output to include only the specified
volume-sets, where volume-sets is a comma-delimited
list of volume names. When displaying Remote Mirror
statistics, the name specified is compared to the
Remote Mirror primary volume to determine if they
match. Additionally, an Remote Mirror volume should
be specified as <host>:<volume> where <host> is the
primary or secondary host and <volume> is the vol‐
ume name by which that host recognizes the volume
set. When specifying multiple Remote Mirror volumes
sets, be aware that each volume set specified is
evaluated individually, using the rules above. When
displaying Point-in-Time Copy statistics, the vol‐
ume name specified is compared to the Point-in-Time
Copy shadow volume to determine if they match.
-f Output field headers at every reporting cycle.
-F Output field headers once, when reporting begins.
-z Suppress report lines that have zero values or no
activity.
OPERANDS
The dsstat command line supports the following operands:
interval
Specifies the interval for each report, in seconds. If no interval
is specified, a single report with a one second interval is output.
Due to the varying number of entries in a given set and the varying
number of sets, header information might appear in the middle of a
set being reported. To avoid this, use the -f or -F options to dis‐
play the header information at the desired time.
count
Specifies the number of reports to generate. If no count is speci‐
fied, output continues until interrupted.
Field Descriptions
Unless otherwise specified, all fields are per-second averages based on
the data collected during the specified interval.
name Name of the entity being reported
t Volume type
s Volume status
r Cache read behavior
w Cache write behavior
pct Percentage of volume requiring sync
role Role of the item being reported
tps Total number of reads + writes
rtps Number of reads
wtps Number of writes
kps Total kilobytes read + written
rkps Kilobytes read
wkps Kilobytes written
crkps Kilobytes read from cache
drkps Kilobytes read from disk
cwkps Kilobytes written to cache
dwkps Kilobytes written to disk
ckps Kilobytes transferred to or from cache
dkps Kilobytes transferred to or from disk
svt Service time per operation
hit Read hits during interval
ds/s Kilobytes destaged from cache
cn/s Number of write cancellations
q Type of asynchronous queuing being used
qi Number of items currently queued
qk Kilobytes currently queued
qhwi High water mark of queued items
qhwk High water mark of queued kilobytes
The name field displays only the last 16 characters of the name.
Valid cache behaviors for cache are:
C Cache reads/writes
D Disk reads/writes
Valid volume types for ii are:
I Independent shadow volume
D Dependent shadow volume
Valid volume status for ii is:
C Copy in progress
- No copy in progress
Valid volume types for sndr are:
P This is the primary host of this volume set
S This is the secondary host of this volume set
Valid volume status for sndr is:
L Changes to this volume are being logged
Q Volume are in queuing mode
R Replicating changes to secondary
SY Synchronization in progress. Sending data.
RS Reverse synchronization in progress. Receiving data.
SN Synchronization needed
RN Reverse synchronization needed
VF Volume failed
BF Bitmap failed
QF Queue failed
Valid queue types for sndr are:
D Disk-based queuing enabled
M Memory-based queuing enabled
Volume roles for sndr are:
net Network volume statistics
bmp Bitmap volume statistics
Volume roles for ii are:
mst Master volume statistics
shd Shadow volume statistics
bmp Bitmap volume statistics
ovr Overflow volume statistics
EXAMPLES
Example 1 Report Cache Statistics
The following example shows the display of Report Cache statistics,
with detailed breakdowns of read and writes to cache/disk. Reports are
generated at five second intervals. Reporting is limited to the set
/dev/rdsk/c1t1d0s0.
# dsstat-m cache -d rw -s /dev/rdsk/c1t1d0s0 5
- read - - write -
name ckps dkps hit ckps dkps hit
dev/rdsk/c1t1d0s0 0 0 0.00 0 0 0.00
dev/rdsk/c1t1d0s0 3 2396 0.13 983 763 100.00
dev/rdsk/c1t1d0s0 2399 799 75.00 2815 2686 100.00
dev/rdsk/c1t1d0s0 3200 800 80.00 2755 2908 100.00
dev/rdsk/c1t1d0s0 3999 799 83.33 2809 2868 100.00
dev/rdsk/c1t1d0s0 4800 800 85.71 2867 2931 100.00
Example 2 Report Master, Shadow and Bitmap Statistics
Report master, shadow and bitmap statistics for Point-in-Time Copy,
using default output. Generate reports at two second intervals.
# dsstat-m ii -r msb 2
name t s pct role kps tps svt
dev/rdsk/c0t1d0s5 I C 96.15 mst 19921 38 22
dev/rdsk/c0t1d0s6 shd 9960 19 20
dev/rdsk/c0t1d0s7 bmp 39 77 2
dev/rdsk/c0t1d0s5 I C 94.24 mst 19623 38 22
dev/rdsk/c0t1d0s6 shd 9939 19 20
dev/rdsk/c0t1d0s7 bmp 39 77 2
dev/rdsk/c0t1d0s5 I C 92.34 mst 19969 39 22
dev/rdsk/c0t1d0s6 shd 9984 19 20
dev/rdsk/c0t1d0s7 bmp 39 78 2
Example 3 Report Network Statistics for Remote Mirror
Report network statistics for Remote Mirror, using detailed read, write
statistics. Report includes volume type/status flags and percentages.
Generate reports at two second intervals. Limit reporting to the set
/dev/rdsk/c0t1d0s0.
# dsstat-m sndr -r n -d rwpf -s /dev/rdsk/c0t1d0s0 2
name t s pct role rkps rtps wkps wtps
dev/rdsk/c0t1d0s0 P L 100.00 sec 0 0 0 0
dev/rdsk/c0t1d0s0 P SY 99.90 sec 0 0 288 9
dev/rdsk/c0t1d0s0 P SY 97.90 sec 0 0 5296 165
dev/rdsk/c0t1d0s0 P SY 95.81 sec 0 0 5184 161
dev/rdsk/c0t1d0s0 P SY 93.81 sec 0 0 5280 164
dev/rdsk/c0t1d0s0 P SY 91.71 sec 0 0 5198 162
EXIT STATUS
The following exit values are returned:
0 Successful completion.
1 Successful completion, no statistics to report.
2 An invalid argument has been encountered.
3 No memory is available to create kstat statistics.
4 An unknown error has occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │service/storage/avs/cache- │
│ │management, service/stor‐ │
│ │age/avs/cache-management │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Committed │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOdscfg(1M), svadm(1M), ds.log(4), rdc.cf(4), attributes(5)SunOS 5.11 2 Oct 2007 dsstat(1M)
