Clear Device Errors; Configure Read Ram Cache (Advanced, Backend); Pools - Dell EMC VxFlex Ready Node User Manual

Clear device errors

Configure Read RAM Cache (advanced, Backend)

Clear device errors.
About this task
Procedure
1. In one of the Backend views, navigate to the device in the table, and select its
row.
2. Right-click the row and select Clear Device Errors.
The Read RAM Cache feature improves your system's application performance for
storage-related activities. By default, caching is disabled.
About this task
To use Read RAM Cache, you need to configure settings at two levels:
Storage Pool—controls Read RAM Cache for all the SDSs in the selected Storage
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Pool. Caching can be enabled or disabled, and either Cached (default) or
Passthrough Write Handling modes can be selected. When Read RAM Cache is
enabled in a Storage Pool, the feature is enabled at Storage Pool level. However,
caching must also be set to Enabled in each SDS in the Storage Pool. Caching will
only begin once storage devices have been added to the SDSs. It is possible to
enable RAM caching for a Storage Pool and then disable caching on one or more
SDSs individually.
Per SDS—controls Read RAM Cache for one or more SDSs. Caching can be
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enabled or disabled for the specified SDS, and the capacity allocated for caching
on an SDS can be specified. Caching will only begin after one or more storage
devices are added to the SDSs. Ensure that the feature is also enabled at Storage
Pool level.
Note: Only I/Os that are multiples of 4k bytes can be cached.
To configure caching, perform these steps:
Procedure
1. In the Backend > Storage view, navigate to, and select the desired Storage

Pools.

2. Right-click the selected Storage Pools, select Configure Caching and then
Configure Read RAM Cache.
The Configure Read RAM Cache dialog box appears. The right pane of the lists
the Storage Pools that you are configuring.
3. Select or clear the Read RAM Cache Enabled check box (selected=used;
clear=not used).
4. Click OK.
Read RAM Cache at Storage Pool level is done. To configure the feature at SDS
level, go to the next step.
5. To enable, disable, or configure cache size for SDSs, in the Backend > Storage
view, navigate to, and select the desired SDS(s).
6. Right-click the SDS and select Configure Caching and then Configure Read
RAM Cache.
Configuring the System using the VxFlex OS GUI
Dell EMC VxFlex Ready Node AMS User Guide
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