Hp StorageWorks XP Remote Web Console Software Manual de usuario descargar pdf (Pagina 29)

Table 16 Additional Shared Memory for the V-VOL Management Area

Shared Memory Shared Memory Capacity

XP Snapshot 1 751,619,276 by

tes

XP Snapshot 2 1,073,741,823 bytes

XP Snapshot 3 2,147,483,647 bytes

To calculate the maximum number of XP Snapshot pairs that can be created for a subsystem, use the

formula below:

Maximum number of XP Snapshot pairs = Total capacity of P-VOLs ÷

{↑(Capacity of one P-VOL ÷ 512)↑ × 512}

512: Unit by which pool association information manages the capacity of a P-VOL (in megabytes)

Note that you must round up the value enclosed by the two upward arrows (↑) to the nearest whole

number.

Note:

Pool association information manages the P-VOL capacity by 512 GB.

To calculate the total capacity of P-VOLs, use the formula below:

Total capacity of P-VOLs = ↑(S1 ÷ 8,736)↑ × 2,048 × 256

S1: Shared memory capacity for pool association information (in bytes)

8,736: Capacity of pool association information per one table (in bytes)

2,048: Numb

er of slots of the P-VOL which can be managed by the pool association information for one

table

256: Capacity of one slot (in kilobytes)

Note that yo

u must round up the value enclosed by the two upward arrows (↑) to the nearest whole

number.

To calculate S1 (shared memory capacity for pool association information), use the formula below:

S1=S − S2-10

S: Shared memory capacity for the whole V-VOL management area (in bytes)

S2: Shared memory capacity for the pool management block (in bytes)

10: Fixed management information (in megabytes)

Note:

You can check the capacity of the shared memory of the pool association information and the pool

management block in the XP Snapshot window. See Figure 8 on page 42.

To calculate S2 (shared memory capacity for pool management block), use the formula below:

S2 = ↑[{{P ÷ 256) × 32} ÷ 8,736]↑ × 8,736 + ↑[{{Y ÷ 256} ÷ 272} ÷

2,04

8]↑ × 8,736

P: Total c

apacity of all pools (in kilobytes)

Y: Total capacity of the pool-VOLs (in kilobytes)

256: Capacity of one slot (in kilobytes)

32: Capac

ity of the table which you need to manage the pool of one slot

8,736: Mi

nimum size of the pool management block (in bytes)

272: Numb

er of slots that can be managed by the slot management table

2,048: Nu

mber of slots that can be managed by the pool management block of the minimum size

XP24000 Snapshot User's Guide

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