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NEC Storage VirtualCachePartitioning
Function to set cache segments
This function allows you to partition cache memory into cache segments and assign logical disks to be used for tenants (business operations) to them. NEC Storage Manager client can be used to perform these operations.
Defining or deleting cache segments
Define or delete cache segments. Or, a cache segment can be reserved as a free space.
Defining size of cache segments
Define or change sizes of cache memory to be allocated to cache segments. Sizes can be defined by either of two policies; allocate fixed capacity; or allocate variable capacity by setting upper and lower limits.
Set nicknames of your choice to cache segments to facilitate management of cache segments.
Assigning logical disks
Assign logical disks to cache segments on an operation basis and logical disk basis.
Function to display cache segment status
This function displays configuration and status of cache segments. NEC Storage Manager client or command line (iSMview command) can be used.
Displaying usage status
Display whether cache partitioning function is enabled or disabled.
Displaying configuration status
Display nicknames, configured capacity and allocated capacity.
Displaying status of logical disk assignment
Display cache segments and a list of logical disks assigned to the cache segments.
Function to monitor performance
NEC Storage PerformanceMonitor Suite can be used to monitor and analyze workloads on cache segments and it allows you to tune optimal allocation of cache capacity.
Detect and report unexpected high workloads by setting threshold to cache segment performance data.
Perform analysis with a long-term vision by using the accumulated cache segment performance data as a reference.
Using SSD (Solid State Drive) as L2 cache (NEC Storage PerforCache)
Dividing the cache memory reduces the capacity of each cache memory.
Therefore, cache hit misses, that is, HDD (Hard Disk Drive) access may increase.
In that case, if SSD is used as the L2 cache, access to the HDD is suppressed and the degradation of the response performance of the disk array is resolved.