Dell EMC Series, Server Sizing Manual

Page: 24 / 26

The following code makes the group changes to the cluster that reduce the
interruption from 30 seconds to 1minute to 9 seconds or less. The changes affect
the "lazy queue" and other cache related operations on each node.
These changes are required to modify the remove or add node interruption:
declare -i COUNT MDS
BASE=10000
COUNT=$((1.01 * $BASE))
MDS=$(($BASE * 0.75))
isi_sysctl_cluster kern.maxvnodes=$BASE
isi_sysctl_cluster kern.minvnodes=$BASE
isi_sysctl_cluster efs.lin.lock.initiator.lazy_queue_goal=$COUNT
isi_sysctl_cluster efs.ref.initiator.lazy_queue_goal=$COUNT
isi_sysctl_cluster efs.mds.block_lock.initiator.lazy_queue_goal=
$MDS
isi_sysctl_cluster efs.bam.datalock.initiator.lazy_queue_goal=
$MDS
WARNING
If running a mixed workload, these changes can adversely affect the other
workloads that might be present on the cluster.
Testing and validation
24 Dell EMC Storage with ISS SecurOS Sizing Guide