HP 3PAR StoreServ 7450 2-node HP 3PAR OS 3.1.2 Release Notes - Page 36

Remote Copy and Federated Technologies Enhancements, Optimized Flash Architecture

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Remote Copy and Federated Technologies Enhancements • HP 3PAR Remote Copy Software in 1:N configuration is enhanced to provide synchronous mode replication support from source to both the target systems. • HP 3PAR Remote Copy Software is enhanced to support Four Link Connectivity in synchronous and periodic mode. If both source system and target system have four or more nodes, four physical RCFC and four physical RCIP links can be configured between them for a total of eight physical connections between the two StoreServ Storage systems. If four physical links are configured, one link must be configured per node on a four-node system. • HP 3PAR Remote Copy software allows configuring Remote Copy ports and Host ports on the same HBA for all HP 3PAR StoreServ Storage systems. • HP 3PAR Peer Persistence to support Automatic and transparent failover (ATF) technology with VMware vSphere 5.0 and VMware vSphere 5.1. ATF uses the HP 3PAR Quorum Witness to monitor the HP 3PAR StoreServ Storage failure and to automatically determine whether a failover of host service is required. Optimized Flash Architecture HP 3PAR StoreServ Storage takes full advantage of flash media. HP 3PAR StoreServ architecture is adapted to deliver high performance at very low latencies. • Flash-optimized cache algorithms to drive accelerated performance at low latency. • Adaptive Reads. In hard disk drive configurations, data is read from hard disks into the cache in fixed block sizes of 16 KB for read operations. With flash media, HP 3PAR StoreServ Storage reads only the required amount of data into cache and this is called as variable caching. • Adaptive Writes. This optimization helps HP 3PAR StoreServ Storage to reduce writes to flash media thus extending its life. At the same time, it optimizes back-end throughput as only the required amount of data is sent to the back-end. • Autonomic cache offload allows HP 3PAR StoreServ Storage systems to deliver consistent performance at hundreds of thousands of IOPS, without running into cache bottlenecks. Modifications to the HP 3PAR OS The following items are addressed in this release. Issue ID 51126 68204 70043 Item Description Inconsistent inter-node transaction logs cause service outage. Inter-node transaction logs are protected by checksums and inconsistencies in such logs are detected during node down recovery. Inconsistent logs cause subsets of volumes to be marked as inconsistent instead of causing service outages. Resolved an issue in the cluster membership protocol that can cause a healthy node to lose its membership incorrectly. Due to an issue in the cluster membership validation module of HP 3PAR OS, a healthy node might incorrectly lose its membership during a validation run. This issue exists in HP 3PAR OS version 3.1.2 MU1 or earlier. This is resolved and the node passes the membership validation correctly. HP 3PAR OS 3.1.2 MU2 supports VVIDs greater HP 3PAR OS 3.1.2 MU2 supports VVIDs greater than 12287. than 12287. Earlier versions of HP 3PAR OS support VVIDs up to 12287 only. If a downgrade from HP 3PAR OS 3.1.2 MU2 to an earlier version is to be performed, then VVs with IDs greater than 12287 must be removed before starting the downgrade. 36 HP 3PAR OS 3.1.2 MU2 Release Notes

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Remote Copy and Federated Technologies Enhancements
•
HP 3PAR Remote Copy Software in 1:N configuration is enhanced to provide synchronous
mode replication support from source to both the target systems.
•
HP 3PAR Remote Copy Software is enhanced to support Four Link Connectivity in synchronous
and periodic mode. If both source system and target system have four or more nodes, four
physical RCFC and four physical RCIP links can be configured between them for a total of
eight physical connections between the two StoreServ Storage systems. If four physical links
are configured, one link must be configured per node on a four-node system.
•
HP 3PAR Remote Copy software allows configuring Remote Copy ports and Host ports on the
same HBA for all HP 3PAR StoreServ Storage systems.
•
HP 3PAR Peer Persistence to support Automatic and transparent failover (ATF) technology with
VMware vSphere 5.0 and VMware vSphere 5.1. ATF uses the HP 3PAR Quorum Witness to
monitor the HP 3PAR StoreServ Storage failure and to automatically determine whether a
failover of host service is required.
Optimized Flash Architecture
HP 3PAR StoreServ Storage takes full advantage of flash media. HP 3PAR StoreServ architecture
is adapted to deliver high performance at very low latencies.
•
Flash-optimized cache algorithms to drive accelerated performance at low latency.
•
Adaptive Reads. In hard disk drive configurations, data is read from hard disks into the cache
in fixed block sizes of 16 KB for read operations. With flash media, HP 3PAR StoreServ
Storage reads only the required amount of data into cache and this is called as variable
caching.
•
Adaptive Writes. This optimization helps HP 3PAR StoreServ Storage to reduce writes to flash
media thus extending its life. At the same time, it optimizes back-end throughput as only the
required amount of data is sent to the back-end.
•
Autonomic cache offload allows HP 3PAR StoreServ Storage systems to deliver consistent
performance at hundreds of thousands of IOPS, without running into cache bottlenecks.
Modifications to the HP 3PAR OS
The following items are addressed in this release.
Description
Item
Issue ID
Inter-node transaction logs are protected by
checksums and inconsistencies in such logs are
Inconsistent inter-node transaction logs cause
service outage.
51126
detected during node down recovery. Inconsistent
logs cause subsets of volumes to be marked as
inconsistent instead of causing service outages.
Due to an issue in the cluster membership
validation module of HP 3PAR OS, a healthy node
Resolved an issue in the cluster membership
protocol that can cause a healthy node to lose
its membership incorrectly.
68204
might incorrectly lose its membership during a
validation run. This issue exists in HP 3PAR OS
version 3.1.2 MU1 or earlier. This is resolved and
the node passes the membership validation
correctly.
HP 3PAR OS 3.1.2 MU2 supports VVIDs greater
than 12287. Earlier versions of HP 3PAR OS
HP 3PAR OS 3.1.2 MU2 supports VVIDs greater
than 12287.
70043
support VVIDs up to 12287 only. If a downgrade
from HP 3PAR OS 3.1.2 MU2 to an earlier version
is to be performed, then VVs with IDs greater than
12287 must be removed before starting the
downgrade.
36
HP 3PAR OS 3.1.2 MU2 Release Notes