HP 3PAR StoreServ 7400 2-node HP 3PAR Command Line Interface Administrator& - Page 79

System Guidelines for Creating Common Provisioning Groups, Common Provisioning Group CLI Commands

Page 79 highlights

There are several courses of action you can take such as adding physical disks to the system, or limiting the future growth of volumes that draw from the CPG. Your response can vary, depending on several factors: • Total available space on your system. • Nature of the data running on the system. • Number of CPGs in the system. • Number of volumes associated with those CPGs. • Anticipated growth rate of the volumes associated with the CPGs. CAUTION: Use caution in planning CPGs. The system does not prevent you from setting growth warnings or growth limits that exceed the amount of currently available storage on a system. When volumes associated with a CPG use all space available to that CPG, either any new writes to TPVVs associated with the CPG will fail, or snapshot volumes associated with the CPG may become invalid, or both. Invalid volumes do not handle write failures gracefully and may produce unexpected failures. Do not allow volumes that draw from a CPG to exceed the CPG's growth limit. Exceeding the CPG growth limit can invalidate snapshot volumes. NOTE: By default, the growth warning and growth limits are set to none, which effectively disables these safety features. See the HP 3PAR Messages and Operator's Guide for additional information about specific alerts. Managing alerts is described in "Managing Events and Alerts" (page 118). System Guidelines for Creating Common Provisioning Groups When you use the advanced parameters for LD creation, use the following guidelines to ensure maximum performance and optimal reliability in the volumes supported by those LDs: • Chunklets in the same RAID set should be from different drive magazines or drive cages. • Chunklets in the same row should be from different physical disks. In other words, a physical disk should not appear twice in the same row. • Chunklets should belong to a disk that is connected through the primary path to the LD's owner node. • The growth increment is limited to 40 chunklets. • The system should use as many physical disks as possible. • The load on all physical disks should be balanced. • The system should use the largest possible row size. Common Provisioning Group CLI Commands Use the following CLI commands to manage CPGs: • showcpg-display CPGs in the system. • createcpg-create CPGs. • setcpg-modify existing CPGs • compactcpg-consolidate LD space in CPGs into as few LDs as possible. • removecpg-remove CPGs from the system or remove specific LDs from CPGs. Common Provisioning Group CLI Commands 79

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There are several courses of action you can take such as adding physical disks to the system, or
limiting the future growth of volumes that draw from the CPG. Your response can vary, depending
on several factors:
Total available space on your system.
Nature of the data running on the system.
Number of CPGs in the system.
Number of volumes associated with those CPGs.
Anticipated growth rate of the volumes associated with the CPGs.
CAUTION:
Use caution in planning CPGs. The system does not prevent you from setting growth
warnings or growth limits that exceed the amount of currently available storage on a system. When
volumes associated with a CPG use all space available to that CPG, either any new writes to TPVVs
associated with the CPG will fail, or snapshot volumes associated with the CPG may become
invalid, or both. Invalid volumes do not handle write failures gracefully and may produce unexpected
failures.
Do not allow volumes that draw from a CPG to exceed the CPG's growth limit. Exceeding the CPG
growth limit can invalidate snapshot volumes.
NOTE:
By default, the growth warning and growth limits are set to
none
, which effectively
disables these safety features.
See the
HP 3PAR Messages and Operator’s Guide
for additional information about specific alerts.
Managing alerts is described in
“Managing Events and Alerts” (page 118)
.
System Guidelines for Creating Common Provisioning Groups
When you use the advanced parameters for LD creation, use the following guidelines to ensure
maximum performance and optimal reliability in the volumes supported by those LDs:
Chunklets in the same RAID set should be from different drive magazines or drive cages.
Chunklets in the same row should be from different physical disks. In other words, a physical
disk should not appear twice in the same row.
Chunklets should belong to a disk that is connected through the primary path to the LD’s owner
node.
The growth increment is limited to 40 chunklets.
The system should use as many physical disks as possible.
The load on all physical disks should be balanced.
The system should use the largest possible row size.
Common Provisioning Group CLI Commands
Use the following CLI commands to manage CPGs:
showcpg
—display CPGs in the system.
createcpg
—create CPGs.
setcpg
—modify existing CPGs
compactcpg
—consolidate LD space in CPGs into as few LDs as possible.
removecpg
—remove CPGs from the system or remove specific LDs from CPGs.
Common Provisioning Group CLI Commands
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