Hp XP P9500 Storage Manuel d'utilisateur télécharger pdf (Page 10)

Performance considerations

Note the following important performance considerations for Compatible XRC operations:

• Block size. Consider the block sizes when configuring the SC sessions: do not issue too many

write I/Os with large blocks to one SC session.

• SDM tuning. The performance of Compatible XRC is affected by the performance of SDM.

You must tune the SDM to achieve the desired performance. For information on SDM tuning,

see the IBM document Implementing ESS Copy Services on S/390.

Restrictions on usage

Behavior of option settings

The behavior of options set in the Change Option window is affected by the Do not Block

parameter of the XADDPAIR command of SDM. The following shows the Compatible XRC options

and the behavior of the P9500 storage system of the Do not Block parameter of the XADDPAIR

command of SDM.

Table 4 Behavior of storage system - block option is “Volume Level”

Behavior of the P9500 Storage SystemCompatible XRC Options

“Do not Block” is Not Specified by SDM (“Block”

is Specified)

“Do not Block” is Specified by

SDM

SettingOption

According to the amount of used sidefile capacity,

the storage system performs “Sleep” - “Wait”

The storage system does not

control the amount of data to

EnableDo not Block

(Volume Level)

command retry when the threshold specified by

SDM is exceeded.

be written to the specified

volume.

N/AN/ADisable*

N/AN/AEnable*Level 1 Sleep

According to the amount of used sidefile capacity,

the storage system performs “Sleep” – “Wait”

The storage system does not

perform “Sleep” – “Wait”

command retry.

Disable

command retry when the threshold specified by

SDM is exceeded.

The storage system reports a SIM to the host when

the usage of sidefile exceeds the sleep wait

threshold.

The storage system does not

report a SIM to the host when

the usage of sidefile exceeds

the sleep wait threshold.

EnableLevel 1 SIM

The storage system does not report a SIM to the

host when the usage of sidefile exceeds the sleep

wait threshold.

The storage system does not

report a SIM to the host when

the usage of sidefile exceeds

the sleep wait threshold.

Disable

N/AN/AEnable*Level 2 Suspend

Even when the amount of used sidefile capacity

exceeds the level-2 threshold, level-2 suspension

Even when the amount of used

sidefile capacity exceeds the

Disable

does not occur and the storage system does not

report SCP-SCI to the host.

level-2 threshold, level-2

suspension does not occur and

the storage system does not

report SCP-SCI to the host.

* You cannot use this setting when the block option of XRC is set to Volume Level.

10 Requirements and restrictions

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Hp XP P9500 Storage Manuel d'utilisateur Page 10

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