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2019
November 28th, 2011 06:00
Cache hit ratio and Read/write ratio
Hi all
I would like to retrieve, using command line or SMC, the global cache hit ratio of our DMX4 and the global read/write ratio.
I think symstat could help me but there is a lot of parameter, and I'm not sure to use the good one.
I've tried this one, but displays anything except the date and time :/
symstat -type cache -i 6 -c 4 -sid XXXX
Thanks a lot.
Christophe
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clepron1
32 Posts
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November 28th, 2011 07:00
yes we have, but we don't use it often. We will check in.Thanks
dynamox
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20.4K Posts
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November 28th, 2011 07:00
do you have SPA ? It's all in there nice and pretty graphs.
clepron1
32 Posts
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November 28th, 2011 07:00
Following that, I've found a command, and cleaned it with 'grep' like this.
symstat -type REQUEST -sid 3423 -i 6 -c 4|grep -E "Total|DEVICE|READ"
DEVICE IO/sec KB/sec % Hits %Seq Num WP
16:06:51 READ WRITE READ WRITE RD WRT RD WRT Tracks
Total 18015 8120 600200 289422 90 99 13 8 193010
Total 19875 8848 594633 303927 89 99 12 9 189172
Total 20083 11256 589119 391190 89 99 11 9 203140
Total 21741 8696 686311 305755 90 99 16 12 201140
The following statistics are returned:1. Host timestamp of the sample.2. Active Symmetrix device name and host physical device name (if the device isvisible).3. Read cache request rate (requests per second).4. Write cache request rate (requests per second).5. Read throughput rate (kilobytes per second).6. Write throughput rate (kilobytes per second).7. Read/write cache hit ratio (percentage of write hits).8. Sequential read/write ratio (percentage of sequential reads).9. Write-pending track count
Do you think is the good command to use ?