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тАО09-19-2007 05:36 PM
тАО09-19-2007 05:36 PM
While in the middle of copying data from a filesystem holding Oracle datafiles into another filesystem on a VA7410 array, the I/O throughput was dramatically reduced.
The server is rp4440 server with multiple CPUs. SG-cluster and applications were offline, the system load was minimal and there is no significant other I/O in the arrays.
SOURCE /d/db filesystem exists in a EMC CLARiion CX-700 array (it holds about 540 GB data)
TARGET /d/backup filesystem exists in a VA7410 array. The filesystem usage can be seen below:
Before starting:
Filesystem kbytes used avail %used Mounted on
/dev/vgbackup/lvol1
1611792384 692004256 912873936 43% /d/backup
/dev/vgdb/lvol1 816054272 568495080 245698640 70% /d/db
After:
/dev/vgbackup/lvol1
1611792384 989401624 617799920 62% /d/backup
/dev/vgdb/lvol1 816054272 568495112 245698608 70% /d/db
The purpose was to take an offline backup. For this activity 'cp' command was used for the backup.
After 305 GB of the data was copied the I/O throughput was reduced into one tenth of the original speed.
(From 6GB/min into 0.5 GB/min). Because of the reduced I/O, the activity had to aborted.
Before posting more technical details, I'd like to know has anyone experienced similar problems before?
armdsp does not show any HW faults or Warnings.
ARRAY INFORMATION
Array Status:_________________________Ready
Firmware Revision:____________________38370A120P1111031050
Product Revision:_____________________A120
Local Controller Product Revision:____A120
Remote Controller Product Revision:___A120
Last Event Log Entry for Page 1:______37416146
Last Event Log Entry for Page 2:______37415811
Last Event Log Entry for Page 5:______36983827
CAPACITY USAGE
Total Disk Enclosures:________________4
Redundancy Group:_____________________1
Total Disks:________________________28
Total Physical Size:________________934.6 GB
Allocated to Regular LUNs:__________782.024 GB
Allocated as Business Copies:_______0 bytes
Used as Active Hot Spare:___________0 bytes
Used for Redundancy:________________152.315 GB
Unallocated (Available for LUNs):___267 MB
Redundancy Group:_____________________2
Total Disks:________________________28
Total Physical Size:________________934.6 GB
Allocated to Regular LUNs:__________798 GB
Allocated as Business Copies:_______0 bytes
Used as Active Hot Spare:___________0 bytes
Used for Redundancy:________________135.991 GB
Unallocated (Available for LUNs):___624 MB
WARNINGS
None
Solved! Go to Solution.
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тАО09-19-2007 05:48 PM
тАО09-19-2007 05:48 PM
Re: VA7410 sudden reduction of I/O throughput
I noticed already the old firmware.
Hope this helps!
Regards
Torsten.
__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.
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тАО09-19-2007 07:14 PM
тАО09-19-2007 07:14 PM
Re: VA7410 sudden reduction of I/O throughput
I run sar -d 1 10 while the copying was in progress.
The vgbackup volume group consists of two LUNs which device files in OS are:
c6t0d1 and c6t0d2
In the sar output for some reason only the second device file shows busy% close to 100%.
I find this strange because the logical volume is LVM striped.
Attached:
-armdsp -a , full output
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тАО09-19-2007 07:18 PM
тАО09-19-2007 07:18 PM
Re: VA7410 sudden reduction of I/O throughput
-sar -d 1 10 output
-vgdisplay -v vgbackup
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тАО09-19-2007 09:30 PM
тАО09-19-2007 09:30 PM
Re: VA7410 sudden reduction of I/O throughput
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тАО09-20-2007 12:53 AM
тАО09-20-2007 12:53 AM
Re: VA7410 sudden reduction of I/O throughput
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тАО09-20-2007 02:14 PM
тАО09-20-2007 02:14 PM
Re: VA7410 sudden reduction of I/O throughput
the armperf command to run are following :
#armperf -c OPAQUE -x COMMA -s mmddhhMM[yyyy]
#armperf -c ARRAY -x COMMA -s mmddhhMM[yyyy]
the output can be displayed from ms-excel.
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тАО09-20-2007 03:05 PM
тАО09-20-2007 03:05 PM
Re: VA7410 sudden reduction of I/O throughput
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тАО09-20-2007 03:47 PM
тАО09-20-2007 03:47 PM
Re: VA7410 sudden reduction of I/O throughput
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тАО09-20-2007 05:20 PM
тАО09-20-2007 05:20 PM
Re: VA7410 sudden reduction of I/O throughput
The data is gathered from the time of the incident. You can see big drop in the performance in the 11.02 sample. Maybe this will give additional clues what happened.