Dell EMC VxFlex Ready Node 14G User Manual

Parameter Description
--file <CONFIG_FILE_NAME> The name of the configuration file to which
the MDM information should be written
--only_cfg Do not call the kernel to actually connect
Example
/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
Permanent Device Loss state
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: https://
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.
Enabling support of PDL state on the ESXi
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:
l
<<PREVIOUS_MODULE_PARAMS>> is any previous module parameters
being used for this ESXi host.
l
<TIMEOUT_VALUE> is the timeout time in milliseconds. Its value can be
1000-3600000 (default is 60000) and including it in the command is
optional.
2. Reboot the host.
Managing System Objects
Dell EMC VxFlex Ready Node AMS User Guide 151

Dell EMC VxFlex Ready Node 14G Specifications

General

Brand	Dell
Model	EMC VxFlex Ready Node 14G
Category	Server
Language	English