Hp XP20000XP24000 Disk Array Manual do Utilizador descarregar pdf (Página 29)

Table 11 Pool Requirements

Item

Requirement

Pool capacity

8 GB to 286 TB per

pool

The capacity of

the pool is calculated by the following formulas:

The capacity of the pool (MB) = total page number × 42 − (4116+ 84×pool-VOL

number)

Total page number = Σ(↓↓block number of pool-VOL ÷ 512↓ ÷168↓)

↓↓:Truncate t

he part of the formula between the arrows after the decimal point.

Number of pool-VOLs

1 to 256 per pool

You cannot register volumes that have already been registered as pool-VOLs

in another pool. If you create pools for XP Snapshot, the pools for XP Thin

Provisioning will decrease.

Number of Pools

Up to 32 total pools maximum per storage system for both XP Snapshot and XP

Thin Provisioning. Pool IDs (0 to 127) are assigned as pool identiﬁers.

Increasing capacity

Although yo

u can increase pool-VOL capacity online, increasing parity group

capacity in

stead is recommended.

Reducing capacity

Although you can increase pool-VOL capacity online, increasing parity group

capacity instead is recommended.

Deleting You can delete pools to which V-VOLs are not associated.

Threshold

The follow

ingtwo thresholds arefor monitoring thefreeareainthe pool.

Pool threshold 1: Default value is 70% of total pool capacity. You can set it

between 5% and 95%, in 5% increments. The default value is recommended.

Pool threshold 2: Always 80% of total pool capacity.

Pool usage over either threshold will cause a warning to be issued via a SIM

and an SNMP trap.

Data allocation unit

42 MB

At least 42 MB of the area is allocated in a pool for writing by the host.

XP24000 Thin Provisioning Software User's Guide

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