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Shared Memory Re

quirements

XP Thin Provisioning requires its own dedicated shared memory for the V-VOL management area, which

is separate from the shared memory for XP Snapshot. The required shared memory will be installed by

your HP service

representative.

Operating System and File System Capacity

Certain combinations of operating systems and ﬁle systems can reduce the ﬁle system capacity for XP

Thin Provisioning. The following table shows the effects of these combinations. For more information,

contact your HP service representative.

Table 13 Operating System and File System Capacity

Operating

System

File System

Meta-Data Writing

Capacity reduction

Windows

Server 2003

NTFS

Writes the ﬁrst meta-data.

Yes

Linux

XFS

Writes the meta-data in the

Allocation Group Size units.

Yes

If the Allocation Group Size

setting is 640 MB when you

create the ﬁ

le system, the page

size is 42 MB

,and theratio will

be 42 MB ÷ 64

0MB=6.5%.

Therefore

, pool capacity, which

is as much

as 6.5% of the V-VOL

capacity

,will beusedwhenyou

create th

e ﬁle system. There will

be no red

uction if the setting of

the Allo

cation Group Size is too

small.

Ext2

Ext3

Writes the meta-data in 128 MB

increments.

Yes

However, pool capacity, which

is about 30 % of the V-VOL

capacity, is used to create the ﬁle

system.

Solaris

UFS

Writes the meta-data in 52 MB

increments.

VxFS

Write

sthe ﬁrst meta-data.

Yes

AIX JFS

Writes the meta-data in 8 MB

increments.

If you change the Allocation

Group Size settings when

you create the ﬁle system,

the meta-data can be written

to a maximum of 64 MB.

Approximately 65 % of the pool

is used.

JFS2

Writes the ﬁrst meta-data.

Yes

VxFS

Writes the ﬁrst meta-data.

Yes

HP-UX

JFS (VxFs)

Writes the ﬁrst meta-data.

Yes

HFS

Writes the meta-data in 10 MB

increments.

Note

: There will be less reduction if the volume capacity is too small. For example, if the V-VOL capacity

is 100 MB when you use Windows 2003 or NTFS, the ﬁrst page (42 MB) will be assigned. Therefore,

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