Permanent Device Loss State - Dell EMC VxFlex Ready Node User Manual
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Example
Permanent Device Loss state
Enabling support of PDL state on the ESXi
Parameter
--file <CONFIG_FILE_NAME>
--only_cfg
/opt/emc/scaleio/sdc/bin/drv_cfg --mod_mdm_ip
--ip 10.100.20.20
--new_mdm_ip 10.100.20.20,10.100.20.30,10.100.20.40
When the MDM has disconnected from the SDC and a volume mapped to this SDC
has experienced an I/O error, the ESXi host continuously sends I/Os to the device to
determine if the device has become accessible. This can subsequently cause a high
I/O-error load that can lead to the host freezing. In cases where the device is
disconnected long-term, such as when the entire MDM cluster is down during a
network upgrade, the SDC can change the volume state to Permanent Device Loss
(PDL) to prevent more I/O errors coming from the ESXi.
PDL is an ESXi state, which, once enabled, is supported in VxFlex OS. Once the ESXi
host loses connectivity with a device, if a timeout value is reached, the ESXi will be
notified that the device is in a PDL state. The timeout value can be manually set. Once
a device is in a PDL state, the ESXi host no longer attempts to re-establish
connectivity or issue commands to the device.
Recovering a device from PDL state is described in the VMware documentation for
your operating system version. The following link is for ESXi v6.5:
docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.storage.doc/
GUID-A513D44C-71DE-47ED-B781-327F78659404.html
Use the instructions that match your environment.
Enable support of Permanent Device Loss (PDL) state on the ESXi host.
Procedure
1. On the ESXi host:
esxcli system module parameters set –m scini
"<<PREVIOUS_MODULE_PARAMS>> bBlkDevIsPdlActive=1
blkDevPdlTimeoutMillis=<TIMEOUT_VALUE>"
where:
<<PREVIOUS_MODULE_PARAMS>> is any previous module parameters
l
being used for this ESXi host.
<TIMEOUT_VALUE> is the timeout time in milliseconds. Its value can be
l
1000-3600000 (default is 60000) and including it in the command is
optional.
2. Reboot the host.
Description
The name of the configuration file to which
the MDM information should be written
Do not call the kernel to actually connect
Dell EMC VxFlex Ready Node AMS User Guide
Managing System Objects
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