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hit blocks, it is possible that a different I/O characteristic type (file system, database,
or web server) could improve the performance.
Misses Number of host reads where none of the blocks were in the SSD cache. This is an
SSD cache miss where the reads were satisfied from the base virtual disk.
Misses - Blocks Number of blocks in Misses.
Populate
Actions (Host
Reads)
Number of host reads where data was copied from the base virtual.
Populate
Actions (Host
Reads) - Blocks
Number of blocks in Populate Actions (Host Reads).
Populate
Actions (Host
Writes)
Number of host writes where data was copied from the base virtual disk to the SSD
cache.
The Populate Actions (Host Writes) count may be zero for the cache configuration
settings that do not fill the cache as a result of a Write I/O operation.
Populate
Actions (Host
Writes) - Blocks
Number of blocks in Populate Actions (Host Writes).
Invalidate
Actions
Number of times data was invalidated/removed from the SSD cache. A cache
invalidate operation is performed for every host write request, every host read
request with Forced Unit Access (FUA), every verify request, and in some other
circumstances.
Recycle
Actions
Number of times that the SSD cache block has been reused for another base virtual
disk and/or a different LBA range.
For effective cache operation, it is important that the number of recycles is small
compared to the combined number of read and write operations. If the number of
Recycle Actions is close to the combined number of Reads and Writes, then the
SSD cache is thrashing. Either the cache capacity needs to be increased or the
workload is not favorable for use with SSD cache.
Available Bytes Number of bytes available in the SSD cache for use by this RAID controller module.
The available bytes, allocated bytes, and user data bytes are used to compute the
Cache Allocation % and the Cache Utilization %.
Allocated Bytes Number of bytes allocated from the SSD cache by this RAID controller module.
Bytes allocated from the SSD cache may be empty or they may contain data from
base virtual disks.
The available bytes, allocated bytes, and user data bytes are used to compute the
Cache Allocation % and the Cache Utilization %.
User Data Bytes Number of allocated bytes in the SSD cache that contain data from base virtual
disks.
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