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在 11-23-2006 12:49 PM
在 11-23-2006 12:49 PM
請問tru64 有disk Q-depth 的設定嗎
我在網路上看到一篇文章說Service-Q value = 2048 for EVA.
請問tru64 有disk queue_depth 的設定嗎?
請問tru64 有disk queue_depth 的設定嗎?
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在 11-23-2006 01:08 PM
在 11-23-2006 01:08 PM
請問tru64 有disk Q-depth 的設定嗎
Hi Joey,
Please increase the "TagQueueDepth" of HSV from the default 25 to 128 for improving the EVA IO performance.
Modify /etc/ddr.dbase then re-running "ddr_config -c" that will valid after system restarting.
Name = "COMPAQ" "HSV"
#
PARAMETERS:
TypeSubClass = hard_disk, raid
BlockSize = 0
BadBlockRecovery = disabled
DynamicGeometry = true
DisperseQueue = true
LongTimeoutRetry = enabled
ReadyTimeSeconds = 90
TagQueueDepth = 25 =======> 128
RequestSenseLength = 255
..
..
Name = "HP" "HSV"
#
PARAMETERS:
TypeSubClass = hard_disk, raid
BlockSize = 0
BadBlockRecovery = disabled
DynamicGeometry = true
DisperseQueue = true
LongTimeoutRetry = enabled
ReadyTimeSeconds = 90
TagQueueDepth = 25 =======> 128
RequestSenseLength = 255
Note:
The EVA has only 1 queue for all of its LUNs. The queue has 2048 elements. To ensure optimal performance, you
don't want Tru64 to exceed that capacity. As a general rule, the queue depth should be set relative to the number of
LUNs on the EVA. The formula is as follows:
TagQueueDepth = 2048/LUNs
To make the change, edit the /etc/ddr.dbase file and locate the HSV entry, then modify the entry according to the formula above.
Next, recompile the /etc/ddr.db file using the command “ddr_config –c”.
Best regards,
Richard.
Please increase the "TagQueueDepth" of HSV from the default 25 to 128 for improving the EVA IO performance.
Modify /etc/ddr.dbase then re-running "ddr_config -c" that will valid after system restarting.
Name = "COMPAQ" "HSV"
#
PARAMETERS:
TypeSubClass = hard_disk, raid
BlockSize = 0
BadBlockRecovery = disabled
DynamicGeometry = true
DisperseQueue = true
LongTimeoutRetry = enabled
ReadyTimeSeconds = 90
TagQueueDepth = 25 =======> 128
RequestSenseLength = 255
..
..
Name = "HP" "HSV"
#
PARAMETERS:
TypeSubClass = hard_disk, raid
BlockSize = 0
BadBlockRecovery = disabled
DynamicGeometry = true
DisperseQueue = true
LongTimeoutRetry = enabled
ReadyTimeSeconds = 90
TagQueueDepth = 25 =======> 128
RequestSenseLength = 255
Note:
The EVA has only 1 queue for all of its LUNs. The queue has 2048 elements. To ensure optimal performance, you
don't want Tru64 to exceed that capacity. As a general rule, the queue depth should be set relative to the number of
LUNs on the EVA. The formula is as follows:
TagQueueDepth = 2048/LUNs
To make the change, edit the /etc/ddr.dbase file and locate the HSV entry, then modify the entry according to the formula above.
Next, recompile the /etc/ddr.db file using the command “ddr_config –c”.
Best regards,
Richard.
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在 11-24-2006 12:00 PM
在 11-24-2006 12:00 PM
請問tru64 有disk Q-depth 的設定嗎
Hi all,
Increase the TagQueueDepth (= 2048/LUNs) during 128 ~ 255 in /etc/ddr.dbase, then running "ddr_config -c" for getting a new ddr.db.
It should be improved the EVA IO performance after system restarting.
best regards,
Richard.
Increase the TagQueueDepth (= 2048/LUNs) during 128 ~ 255 in /etc/ddr.dbase, then running "ddr_config -c" for getting a new ddr.db.
It should be improved the EVA IO performance after system restarting.
best regards,
Richard.
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