Managing Read Flash Cache; Managing Read Ram Cache - Dell EMC VxFlex Ready Node User Manual
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Managing Read Flash cache
Managing read RAM cache
Operating System
7. On the MDM, modify the SDS port using the command:
scli --modify_sds_port (--sds_id <ID> | --sds_name <NAME> | --
sds_ip <IP>) --new_sds_port <PORT>
For example, for an SDS called "sds198" where the new port number is 7071,
type:
scli --modify_sds_port --sds_name sds198 --new_sds_port 7071
Note:
If you modify the SDS port on the MDM first, instead of following the
above procedure, I/O errors might be encountered.
This section describes how to manage the Read Flash Cache (RFcache) feature,
which uses PCI flash cards, SSDs and NVMe SSDs for caching of the HDDs in the
SDS, thus accelerating the reads of its HDD devices.
RFcache devices and configuration can be performed during initial system
deployment. If you want to add the use of the RFcache feature after deployment, use
the following work flow:
1. Ensure that the RFcache policy is enabled in the Storage Pool.
2. Enable RFcache in the SDSs where RFcache devices will be added.
3. Add the RFcache devices to the SDSs.
If you want to stop using the RFcache feature, or remove a specific RFcache
device, use the following work flow:
4. Stop RFcache usage in the Storage Pool
5. Remove (command) the RFcache device from the SDS.
6. You can then do one of the following:
Physically remove the device from the chassis, and then restart RFcache usage
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in the Storage Pool
Add the device to the SDS as a storage device
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This section describes how to manage the read RAM cache feature, which is designed
to allocate RAM on nodes for caching of reads or writes. The feature is configured at
the following levels:
For a volume (optional)—specific volume to use or not use caching. If you want all
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I/Os for a specific volume to use caching, make sure that the volume, the
corresponding Storage Pool, and its SDSs are all configured for using caching.
For one or more Storage Pools—caching must be configured at this level for
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caching to work in the corresponding SDSs. Write handling mode can also be
configured via the add_storage_pool command, or in a separate command. To
Task
Dell EMC VxFlex Ready Node AMS User Guide
Managing System Objects
143
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