Dell PowerVault MD3420 - Manual (Page 352)

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.
The available bytes, allocated bytes, and user data bytes are used to compute the
Cache Allocation % and the Cache Utilization %.
Show Storage Array
Description
This command returns configuration information about the storage array. The parameters return lists of
values for the components and features in the storage array. You can enter the command with a single
parameter or more than one parameter. If you enter the command with no parameters, the entire storage
array profile is displayed (which is the same information as if you entered the profile parameter).
Syntax
show storageArray (autoSupportConfig | profile | batteryAge
| connections | defaultHostType | healthStatus | hostTypeTable |
hotSpareCoverage | features | time | virtualDiskDistribution
longRunningOperations
| summary)
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