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May 4th, 2007 01:00
About acp_wp or acp_disk mode and the skew value
As we know the acp_wp and acp_disk mode is the secondary srdf mode,SRDF-S and SRDF-Semi is the primary srdf mode.
Q1:Does it mean if i need to set the DG to acp mode,we have to set it to SRDF-S or SRDF-Semi mode first then set it to acp mode ?
Q2: I think only when the skew value was defined while setting a device group to acp_disk or acp_wp mode, should the SRDF mode would switch between SRDF primary mode and acp_wp or acp_disk mode according to whether the invalids tracks is larger than the skew value. In this situation i should first set the device group to SRDF-S OR SRDF-Semi mode and then change the DG to acp_wp or acp_disk mode. Am i right?
Q3: When skew is defined, there exists secondary srdf mode and primary srdf mode. For example if a set a device group to acp_disk mode without giving the skew value, the device group's mode will never change to SRDF-S or SRDF-Semi unless i manually set it to these modes. Is that right?
Q4: If i want to set a device group to acp_wp or acp_disk mode, How can i decide whether to use the skew value ?
Q1:Does it mean if i need to set the DG to acp mode,we have to set it to SRDF-S or SRDF-Semi mode first then set it to acp mode ?
Q2: I think only when the skew value was defined while setting a device group to acp_disk or acp_wp mode, should the SRDF mode would switch between SRDF primary mode and acp_wp or acp_disk mode according to whether the invalids tracks is larger than the skew value. In this situation i should first set the device group to SRDF-S OR SRDF-Semi mode and then change the DG to acp_wp or acp_disk mode. Am i right?
Q3: When skew is defined, there exists secondary srdf mode and primary srdf mode. For example if a set a device group to acp_disk mode without giving the skew value, the device group's mode will never change to SRDF-S or SRDF-Semi unless i manually set it to these modes. Is that right?
Q4: If i want to set a device group to acp_wp or acp_disk mode, How can i decide whether to use the skew value ?
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