V-vol requirements – HP StorageWorks XP Remote Web Console Software User Manual
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Table 10 Pool-VOL Requirements (continued)
Requirement
Item
You must perform LDEV formatting before the volume is registered in a pool. You
cannot format pool-VOLs.
LDEV format
You cannot remove pool-VOLs registered in pools. You need to delete the pool in
order to free the volumes.
Deleting pool-VOLs
You cannot specify a volume with a path definition as a Pool-VOL.
Path definition
Table 11 Pool Requirements
Requirement
Item
See
for the formula for calculating capacity. The upper limit of
total capacity of all pools is 1.1 PB.
Pool capacity
Up to 1024 per pool.
Max number of
pool-VOLs
Up to 128 total pools maximum per storage system for XP Thin Provisioning. Pool
IDs (0 to 127) are assigned as pool identifiers. The number of XP Thin Provisioning
pools reduces the total availability of XP Snapshot pools.
Max number of Pools
You can increase Pool-VOL capacity dynamically; increasing capacity by one or
more parity groups is recommended.
Increasing capacity
You cannot reduce pool capacity. You must delete and then reconfigure the pool.
Reducing capacity
You can delete pools that are not associated with any V-VOLs.
Deleting
Pool threshold 1: Default value is 70%. You can set it between 5% and 95%, in
5% increments.
Pool threshold 2: Fixed at 80%.
Pool usage over either threshold will cause a warning to be issued using a SIM
and an SNMP trap.
Thresholds
42 MB
Data allocation unit
Table 12 V-VOL Requirements
Requirement
Item
V-VOL. The LDEV number is the same as for normal volumes.
Volume type
Servers (including XP RAID Manager) will show emulation types as follows:
•
OPEN-0V for V-VOLs created with microcode version 60.02.06 or earlier
•
OPEN-V for V-VOLs created with microcode version 60-02-25 or later
Emulation type
Up to 8,192 volumes per pool
Up to 1,024 volumes per volume group
Up to 63,232 volume groups per system
Maximum number of
V-VOLs
46 MB to 4 TB per volume
Total maximum volume capacity of 1.1 PB per storage system.
Volume capacity
The V-VOL threshold is the proportion of the potential demand a V-VOL can consume
of the pool capacity.
The default value is 5% of the potential capacity. You can set it between 5% and
300%, in 5% increments. The default value is recommended.
Threshold
Preparing the Storage System and Remote Web Console Computers
27