Caching Updates For Vxflex Os 2.X/3.X - Dell EMC VxFlex Ready Node User Manual
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VxFlex OS performance fine-tuning
Caching Updates for VxFlex OS 2.x/3.x
Dell EMC VxFlex Ready Node AMS User Guide
114
Task
To view full parameter settings of a specific SDS (this also shows the
MDM settings)
To view full parameter settings of a specific SDC (this also shows the
MDM settings)
Note:
Refer to the "Performance Parameters" for a list containing all default and
performance profile parameters.
VxFlex OS offers the following types of caching, for the purpose of enhancing system
performance:
RAM Read Cache (using a server's DRAM memory)
l
DAS Cache or Cachecade (for information on DAS Cache, see VxFlex Ready Node
l
documentation)
Read Flash Cache (using SSDs or flash PCI cards)
l
Note:
SSDs used for caching cannot be used for storage purposes.
The following table summarizes information about the caching modes provided by the
system.
Mode
Description Considerations
RAM Read
Read-only
Cache
caching
(rmcache)
performed by
server RAM.
Read Flash
Read-only
Cache
caching
(RFCache)
performed by
one or more
dedicated
SSD devices
or flash PCI
RAM Read cache, the fastest type of caching,
uses RAM that is allocated for caching. Its
size is limited to the amount of allocated
RAM.
RMCache should only be used for HDD pools.
Read Flash Cache uses the full capacity of
SSD or flash PCI devices (up to eight) to
provide a larger footprint of read-only LRU
(least recently used) based-caching resources
for the SDS. This type of caching reacts
quickly to workload changes to speed up HDD
Read performance.
Command
Execute the
command:
scli --
query_performan
ce_parameters
--sds_name
<NAME> --
print_all
Execute the
command:
scli --
query_performan
ce_parameters
--sdc_name
<NAME> --
print_all
Default
Setting
Disabled
Disabled
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