Hp XP7 Storage Manual de usuario descargar pdf (Pagina 32)

Requirements for Fast Snap tasks

You must calculate the number of FS pairs you can create. When you create FS pairs for a P-VOL

for the first time, the number of FS pairs that you can create in a storage system depends on the

following:

• The number of FS pairs that you can create based on the number of available pair tables (see

“Calculating the number of Fast Snap pairs based on pair tables” (page 32)).

• The snapshot estimated manageable capacity (see “Workflow for calculating Fast Snap pairs

based on the snapshot estimated manageable capacity” (page 32)).

• The number of cache management devices that you must make available (see “Workflow for

calculating Fast Snap pairs based on cache management devices” (page 33) and “Calculating

the number of cache management devices” (page 33)).

The smallest of the three calculations is the maximum number of FS pairs that you can create in

the storage system.

When you create FS pairs again, you only need to know the number of pair tables to calculate

the number of FS pairs that you can create. You do not need to know the snapshot estimated

manageable capacity or the number of cache management devices.

If you have multiple P-VOLs, calculate the number of FS pairs that you can create for each P-VOL

in the storage system.

Calculating the number of Fast Snap pairs based on pair tables

Pair tables contain information that is required to manage FS pairs. Each FS pair requires at least

one pair table. You can use up to 1,048,575 pair tables in a XP7 storage system.

1. View the number of existing FS pairs (see “Viewing local replication summary information”

(page 90)).

2. Calculate the number of FS pairs that you will need using the following formula:

The number of FS pairs you will need based on pair tables = 1,048,575

- (the number of existing FS pairs)

Workflow for calculating Fast Snap pairs based on the snapshot estimated

manageable capacity

Use the following workflow to calculate the number of FS pairs you can create based on the

snapshot estimated manageable capacity:

1. View the snapshot estimated manageable capacity (see “Viewing local replication summary

information” (page 90)).

2. Calculate the number of FS pairs that you can create using the following formula:

The number of FS pairs that you can create = The snapshot estimated

manageable capacity / The snapshot management capacity in a P-VOL

The snapshot estimated manageable capacity in a P-VOL = (the P-VOL

capacity of FS pairs [TB] / 2.6 [TB]) * 3,024 [GB] + (168GB * 2

(consumed SM))

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Hp XP7 Storage Manual de usuario Pagina 32