User's Manual

Solution If you have attempted to add the first PCIe SSD by running the fldc --add --ssd command at the

prompt and it did not work, follow the steps below:

1. If the PCIe SSD you are trying to add has no status, check if that specific PCIe SSD is

supported. Only Dell Express Flash PCIe SSDs of 175 GB or 350 GB capacity are

supported as cache media.

2. If the device you are trying to add is supported, determine its status. Run the command:

fldc --list --ssd. If the status is unavailable, the reason listed below helps

determine why the PCIe SSD is not being added, such as whether the PCIe SSD is

partitioned.

If you have an issue while adding the second, third, or fourth PCIe SSD, check for the following

reasons:

• You can only add PCIe SSDs of the same size to Fluid Cache. All PCIe SSDs used in

cache must be either 175 GB or 350 GB. The sizes cannot be mixed in a single

configuration.

• Status information provided by the list command fldc --list --ssd must

disclose PCIe SSD availability for caching and other details you can use to fix the

issue. For example, if the PCIe SSD you are trying to add has a failed status, you cannot

add it to cache.

• The list command may also show that a supported PCIe SSD exists and appears

available or unused for caching. However, after you add it to the cache, the status

changes to failed.

For resolving failed PCIe SSDs, see the

Dell PowerEdge Express Flash PCIe SSD User's Guide

at dell.com/support/manuals and the topic “PCIe SSD Has Failed” in this section.

PCIe SSD Has Failed

Probable Cause

• The status of a PCIe SSD in the cache pool is changed to failed because it is

unplugged.

• The status of a PCIe SSD is changed to failed because it is at end-of-life or has an

internal fault.

Solution If the PCIe SSD is unplugged, follow the steps below:

1. Physically check whether the failed PCIe SSDs is unplugged on your system.

2. If the PCIe SSD is physically present, check if the PCIe SSD is a supported PCIe SSD. If

the PCIe SSD was removed from the system, go to step 5.

3. If the PCIe SSD is supported, get the status of the Fluid Cache service and details on the

state of the cache pool. At the prompt, run any one of the following commands:

– For the status of all PCIe SSDs, run the command: fldc --status

– For the status of a single PCIe SSD, run the command: fldc --status --

ssd=<dev_name>

– For the Fluid Cache status, run the command: fldc --status --cache

The status output shows the PCIe SSD availability. Follow the steps in Configuring Fluid

Cache For DAS Using fldc CLI to reconfigure a supported and available PCIe SSD as a

cache device.

4. If the status continues to show failed, you can examine the events in the log by running

the command: fldc --events