User's Manual

NOTE: If, when removing a failed PCIe SSD, you are blocked from using the Linux device
name, you can use the UID for the PCIe SSD. To obtain the UID, run the fldc --status --ssd
command.
Use this command to initiate a discrete process that prepares the system for the physical
removal of a PCIe SSD from a localhost. After the command is completed, the following
message is displayed:
SUCCESS:
SSD /dev/rssdb being removed from cache pool
This can be a long process, so make sure the SSD is not listed
in
"--status --ssd" command or check for removed event using "--
event" before you physically remove or reuse this SSD
The message from “fldc --event”:
EventID: 2904, MessageID: FLDC2904, severity: Informational,
"The following cache device has been removed."
Cache Dev WWN:(500A075102026041) Cache Dev Path: (/dev/rssdb)
CAUTION: Do not physically remove the PCIe SSD from the localhost until after you
receive the SUCCESS message. Because system operations may continue after you
receive the SUCCESS message, use the fldc --status --ssd command to ensure that the
PCIe SSD is no longer displayed in the list of PCIe SSDs.
Enabling Caching On A Back End PERC Virtual Disk
Command
fldc --enable --disk=<disk_name> --mode=<cache_mode> [--mount]
Description Use this command to enable caching on a back end PERC virtual disk. You must use the --mode
argument and enable a particular caching mode (WB or WT). You can also add the --mount
argument to mount the Fluid Cache disk.
Use the --mount option to ensure that the device you listed in /etc/fstab is actually mounted.
The following conditions must be met for the --mount option to work:
• The backing volume (for example: /dev/sdb) must be unmounted and a commented-out
entry referring to the backing store must exist in /etc/fstab.
• If the backing volume is mounted, the enable caching fails.
• If the backing volume is not mounted, but a commented-out entry in /etc/fstab does not
exist, the enable caching succeeds but the new cache device is not mounted.
The --mount option ensures that the device is in the expected state by verifying if the
information added by the user in /etc/fstab exists.
Disabling Caching On A Back End PERC Virtual Disk
Command
fldc --disable --disk=<disk_name>[--discard --mount]
Description Use this command to disable caching on a back end PERC virtual disk and remove all dirty data
blocks in cache. After the command is completed, a message is displayed indicating a
successful operation. Use the fldc --status --disk command after viewing the confirmation
message to ensure the disk is no longer displayed in the cache. The --umount option ensures
that the device is in the expected state by verifying the information you added in /etc/fstab
exists.
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