HP 3PAR StoreServ 7450 4-node HP 3PAR StoreServ 7450 Storage Installation Guid - Page 88

HP M6710 Drive Enclosure 2U24 Hard Drive Placement

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NOTE: NOTE: SSDs have a limited number of writes that can occur before reaching the SSD's write endurance limit. This limit is generally high enough so wear out will not occur during the expected service life of an HP 3PAR StoreServ under the great majority of configurations, IO patterns, and workloads. HP 3PAR StoreServ tracks all writes to SSDs and can report the percent of the total write endurance limit that has been used. This allows any SSD approaching the write endurance limit to be proactively replaced before they are automatically spared out. An SSD has reached the maximum usage limit once it exceeds its write endurance limit. Following the product warranty period, SSDs that have exceeded the maximum usage limit will not be repaired or replaced under HP support contracts. • The first expansion drive enclosure added to a system must be populated with the same number of drives as the node enclosure. • The drives must be identical pairs. • The same number of drives and type should be added to all of the drive enclosures in the system. • The minimum addition to a two-node system without expansion drive enclosures is two identical drives. • The minimum addition to a four-node system without expansion drive enclosures is four identical drives. HP M6710 Drive Enclosure (2U24) Hard Drive Placement The hard drive pairs should be placed in the lowest available slot numbers. Figure 86 HP M6710 Drive Enclosure (2U24) Hard Drive Placement Order HP M6720 Drive Enclosure (4U24) Hard Drive Placement Hard drive pairs should be populated in columns and in the lowest available vertical slots in that column. Figure 87 M6720 Drive Enclosure (4U24) Hard Drive Placement Order NOTE: For optimal utilization and performance, hard drive quantities and types should be configured symmetrically across all drive enclosures in the system. 88 Adding Hard Drives and Expansion Drive Enclosures

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NOTE:
NOTE: SSDs have a limited number of writes that can occur before reaching the SSD's
write endurance limit. This limit is generally high enough so wear out will not occur during the
expected service life of an HP 3PAR StoreServ under the great majority of configurations, IO
patterns, and workloads. HP 3PAR StoreServ tracks all writes to SSDs and can report the percent
of the total write endurance limit that has been used. This allows any SSD approaching the write
endurance limit to be proactively replaced before they are automatically spared out. An SSD has
reached the maximum usage limit once it exceeds its write endurance limit. Following the product
warranty period, SSDs that have exceeded the maximum usage limit will not be repaired or replaced
under HP support contracts.
•
The first expansion drive enclosure added to a system must be populated with the same number
of drives as the node enclosure.
•
The drives must be identical pairs.
•
The same number of drives and type should be added to all of the drive enclosures in the
system.
•
The minimum addition to a two–node system without expansion drive enclosures is two identical
drives.
•
The minimum addition to a four–node system without expansion drive enclosures is four
identical drives.
HP M6710 Drive Enclosure (2U24) Hard Drive Placement
The hard drive pairs should be placed in the lowest available slot numbers.
Figure 86 HP M6710 Drive Enclosure (2U24) Hard Drive Placement Order
HP M6720 Drive Enclosure (4U24) Hard Drive Placement
Hard drive pairs should be populated in columns and in the lowest available vertical slots in that
column.
Figure 87 M6720 Drive Enclosure (4U24) Hard Drive Placement Order
NOTE:
For optimal utilization and performance, hard drive quantities and types should be
configured symmetrically across all drive enclosures in the system.
88
Adding Hard Drives and Expansion Drive Enclosures