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тАО08-17-2006 05:04 AM
тАО08-17-2006 05:04 AM
I have an EVA 3000.
My applications are too slow.
when I have run
sar -d 2 10 , I saw that some disks are 100% busy.
My backup speed is running between 700KB/s and 2000KB/s which is too slow for an EVA.
I saw on technical documentation that the EVA can deliver up to 300MB/s when I'm under 2M/s.
My EVA is 4 enclosure 56 disks 146G 15K tours/m
Could you please help me
Solved! Go to Solution.
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тАО08-17-2006 07:11 AM
тАО08-17-2006 07:11 AM
Re: EVA 3000 performance too slow
You "could" do some performance test by creating a vdisk, presenting to the host and do "dd" to read and write data, for example:
time dd if=/dev/
This is a destructive test:
time dd if=/dev/zero of=/dev/
In this way, you can check the performance counters again and view the time it takes to read and write the data by using a larger block size and fast I/O.
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тАО08-17-2006 10:29 PM
тАО08-17-2006 10:29 PM
Re: EVA 3000 performance too slow
Thanks for your answer, I got the following output:
# time dd if=/dev/test_perf/lvol1 of=/dev/null bs=8192 count=131072
131072+0 records in
131072+0 records out
real 0m55.81s
user 0m0.14s
sys 0m12.73s
# time dd if=/dev/zero of=/dev/test_perf/lvol1 bs=8192 count=131072
131072+0 records in
131072+0 records out
real 1m30.71s
user 0m0.15s
sys 0m15.95s
#
how can you qualify it ?
I don't know how to interpret it
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тАО08-18-2006 03:41 AM
тАО08-18-2006 03:41 AM
Re: EVA 3000 performance too slow
# time dd if=/dev/test_perf/lvol1 of=/dev/null bs=8192 count=131072
131072+0 records in
131072+0 records out
You READ from the VDISK and write to "nothing", that is /dev/null. You perform 131072 operations with a 8k size, that is 1 GB. The operations took ~ 56 Secs. So, you are reading with a performance of about 19 MB/s.
In the second command:
# time dd if=/dev/zero of=/dev/test_perf/lvol1 bs=8192 count=131072
131072+0 records in
131072+0 records out
real 1m30.71s
user 0m0.15s
sys 0m15.95s
You read from /dev/zero (special file that delivers only zeros) to your VDISK. Again you write 1 GB in 1m 30 secs. That is, your performance is more or less 11 MB/s.
EVA can deliver 300 MB/s, but is not specified under what conditions and tests.
As you can see, the EVA can deliver more that you are getting from your application. But now the question is, is your performance good enough? Well, this test demostrates that can perform better, you can run the test with 64 k block size to increase the performance. You can find more information in this thread:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=979480
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тАО08-20-2006 03:49 AM
тАО08-20-2006 03:49 AM
Re: EVA 3000 performance too slow
If your EVA3000 has one DG with 56disks 15KRPM, so EVA can give 8400 IO/s (56*150IO/s) when the IO is very short. When the IO is more sized, so EVA cache plays and EVA gives a big thruput.
When you does backup, IO size is important.
For example I seen from 180MB/s to 220 MB/s during 4hours on one EVA port during a backup window from EVA 16disks*10KRPM in a DG to LT02 drive.
So, normally EVA performance is not the issue, it's other thing.
Best regards.
Olivier Cavailhe
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тАО08-20-2006 01:44 PM
тАО08-20-2006 01:44 PM
Re: EVA 3000 performance too slow
09:31:08 device %busy avque r+w/s blks/s avwait avserv
Average c27t2d2 100.00 5.21 1264 42590 9.54 6.75
Average c27t4d2 7.44 0.50 83 8243 5.05 1.18
Average c27t4d5 5.44 0.58 311 8534 5.11 0.44
Average c27t0d6 0.15 0.50 1 10 4.92 0.47
Can you paste in 'strings /etc/lvmtab'?
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тАО08-20-2006 07:42 PM
тАО08-20-2006 07:42 PM
Re: EVA 3000 performance too slow
bscs2 root:/ #strings /etc/lvmtab
/dev/vg00
/dev/dsk/c0t6d0
/dev/dsk/c2t6d0
/dev/vgt_06
/dev/dsk/c27t0d0
/dev/vgt_07
/dev/dsk/c27t0d6
/dev/vgt_08
/dev/dsk/c27t1d3
/dev/vgt_09
/dev/dsk/c27t1d4
/dev/vgt_10
/dev/dsk/c27t2d5
/dev/vgt_11
/dev/dsk/c27t0d1
/dev/vgt_12
/dev/dsk/c27t0d2
/dev/vgt_13
/dev/dsk/c27t0d3
/dev/vgt_14
/dev/dsk/c27t0d4
/dev/vgt_15
/dev/dsk/c27t0d5
/dev/vgt_20
/dev/dsk/c27t1d5
/dev/vgt_21
/dev/dsk/c27t1d6
/dev/vgt_22
/dev/dsk/c27t2d0
/dev/vgt_29
/dev/dsk/c27t0d7
/dev/vgt_30
/dev/dsk/c27t1d2
/dev/vgt_31
/dev/dsk/c27t2d6
/dev/vgt_33
/dev/dsk/c27t3d1
/dev/vgt_35
/dev/dsk/c27t1d1
/dev/vgt_36
/dev/dsk/c27t1d0
/dev/vgt_39
/dev/dsk/c27t1d7
/dev/vgt_42
/dev/dsk/c27t3d7
/dev/vgt_44
/dev/dsk/c27t2d2
/dev/vgt_47
/dev/dsk/c27t4d3
/dev/vgt_32
/dev/dsk/c27t3d2
/dev/vgt_41
/dev/dsk/c27t2d4
/dev/vgt_48
/dev/dsk/c27t3d6
/dev/vgt_49
/dev/dsk/c27t4d2
/dev/vgt_50
/dev/dsk/c27t4d4
/dev/vgt_51
/dev/dsk/c27t4d5
/dev/vgt_52
/dev/dsk/c27t2d3
/dev/vgt_53
/dev/dsk/c27t2d7
bscs2 root:/ #
Thanks
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тАО08-21-2006 01:59 AM
тАО08-21-2006 01:59 AM
Solution/dev/dsk/c27t4d5
/dev/vgt_52
/dev/dsk/c27t4d2
/dev/vgt_50
/dev/dsk/c27t0d6
/dev/vgt_08
/dev/dsk/c27t2d2
/dev/vgt_47
09:31:08 device %busy avque r+w/s blks/s avwait avserv
Average c27t2d2 100.00 5.21 1264 42590 9.54 6.75
Average c27t4d2 7.44 0.50 83 8243 5.05 1.18
Average c27t4d5 5.44 0.58 311 8534 5.11 0.44
Average c27t0d6 0.15 0.50 1 10 4.92 0.47
Refer to /etc/fstab to map the file systems for these vgs and run defrag.
/dev/vgt_47, /dev/vgt_08, /dev/vgt_50, /dev/vgt_52
Here's defrag:
# fsadm -F vxfs -D -d -E -e /mount_point
Here's are reference about disk bottlenecks to refer to, it reccommends increasing your cache.
http://www1.itrc.hp.com/service/iv/docDisplay.do?docId=prodITRC/DE_SW_W2K_performance_EN_01_E/Performancenoptimization/Disk_bottleneck_analysis/disk_bottleneck_analysis.htm
In this case, the controller on the server side is your fibre channel adapter (HBA). Your HBA's can be either 1G Hz or 2G Hz. Use this command to determine.
# ioscan -fnC td (* write down the /dev/td#
# tdutil /dev/td#
Start a new thread in the HP-UX forum, paste this information in and ask for comments about changing the memory cache. One more thing, note the HW address of the HBA from ioscan and check logtool for errors:
STM > TOOLS > UTILITY > RUN > LOGTOOL > FILE > RAW SUMMARY
Please include this report if you see a lot of errors. Important to include the start and end date and time at the top of the report.
Thanks!
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тАО08-22-2006 03:58 AM
тАО08-22-2006 03:58 AM
Re: EVA 3000 performance too slow
I think the problem is located on the server
have a look at the test.
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1053539