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HP-UX System Administrator's Guide: Logical Volume Management: HP-UX 11i Version 3

Appendix A LVM Specifications and Limitations

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This appendix discusses LVM product specifications.




	NOTE: Do not infer that a system configured to these limits is automatically usable.

Table A-1 Volume Group Version Maximums

	Version 1.0 Volume Groups	Version 2.0 Volume Groups	Version 2.1 Volume Groups
Maximum data on a single HP-UX system	128 PB	1024 PB	1024 PB
Maximum number of volume groups on a system	256	512^[1]	2048^[1]
Maximum number of physical volumes in a volume group	255	511	2048
Maximum number of logical volumes in a volume group	255	511	2047
Maximum size of a physical volume	2 TB	16 TB	16 TB
Maximum size of a volume group	510 TB	2048 TB	2048 TB
Maximum size of a logical volume	16 TB	256 TB	256 TB
Maximum size of a physical extent	256 MB	256 MB	256 MB
Maximum size of a stripe	32 MB	256 MB	256 MB
Maximum number of stripes	255	511	511
Maximum number of logical extents per logical volume	65535	33554432	33554432
Maximum number of physical extents per physical volume	65535	16777216	16777216
Maximum number of mirror copies (MirrorDisk/UX product required)	2	5	5
^[1]The limit of 2048 volume groups is shared between Version 2.0 and Version 2.1 volume groups. Volume groups of both versions can be created with volume group numbers ranging from 0-2047. However, the maximum number of Version 2.0 volume groups that can be created is 512.

Table A-2 Version 1.0 Volume Group Limits

Parameter	Command to Set/Change Parameter	Minimum Value	Default Value	Maximum Value
Number of volume groups on a system	n/a	0	n/a	256
Number of physical volumes in a volume group	vgcreate –p `max_pv` vgmodify –p `max_pv`	1	16	255
Number of logical volumes in a volume group	vgcreate –l `max_lv` vgmodify –l `max_lv`	1	255	255
Size of a physical volume	pvcreate –s `pv_size`	1 PE	LUN Capacity	2 TB
Size of a logical volume	lvcreate –L `lv_size` lvextend –L `lv_size`	0	0	16 TB
Size of a physical extent	vgcreate –s `pe_size`	1 MB	4 MB	256 MB
Size of a stripe	lvcreate –l `stripe_size`	4 KB	8 KB	32 MB
Number of stripes	lvcreate –i `stripes`	2	n/a	Number of PVs in VG
Number of logical extents per logical volume	lvcreate –l `max_le` lvextend –l `max_le`	0	0	65535
Number of physical extents per physical volume	vgcreate –e `max_pe` vgmodify –e `max_pe`	1	1016^[1]	65535
Number of mirror copies (MirrorDisk/UX product required)	lvcreate –m `copies` lvextend –m `copies`	0	0	2
^[1] If more than 1016 extents are necessary to access all of the first physical volume in the volume group, vgcreate increases the default value to the size of the first physical volume divided by the physical extent size.

Table A-3 Version 2.x Volume Group Limits

Parameter	Command to Set/Change Parameter	Minimum Value	Default Value	Maximum Value
Number of volume groups on a system	n/a	0	n/a	2048^[1]
Number of physical volumes in a volume group	n/a	511	511 (2.0) 2048 (2.1)	511 (2.0) 2048 (2.1)
Number of logical volumes in a volume group	n/a	511	511 (2.0) 2047 (2.1)	511 (2.0) 2047 (2.1)
Size of a volume group	vgcreate –S `max_vgsize`	1 MB^[2]	n/a	2 PB
Size of a physical volume	pvcreate –s `pv_size`	1 PE	LUN Capacity	16 TB
Size of a logical volume	lvcreate –L `lv_size` lvextend –L `lv_size`	0	0	256 TB
Size of a physical extent	vgcreate –s `pe_size`	1 MB	n/a	256 MB
Size of a stripe	lvcreate –l `stripe_size`	4 KB	n/a	256 MB
Number of stripes	lvcreate –i `stripes`	2	n/a	Number of PVs in VG
Number of logical extents per logical volume	lvcreate –l `max_le` lvextend –l `max_le`	0	0	33554432
Number of physical extents per physical volume	n/a	1	LUN Capacity ÷ PE Size	16384
Number of mirror copies (MirrorDisk/UX product required)	lvcreate –m `copies` lvextend –m `copies`	0	0	5
^[1] The limit of 2048 volume groups is shared between Version 2.0 and Version 2.1 volume groups. Volume groups of both versions can be created with volume group numbers ranging from 0-2047. However, the maximum number of Version 2.0 volume groups that can be created is 512. ^[2] If the total size of the specified physical volumes is larger than `max_vgsize`, vgcreate adjusts the minimum volume group size to the total size.

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