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Windows Server single-path and MPIO configuration recommendations for SC Series storage
31 Dell EMC SC Series Storage and Microsoft Multipath I/O | CML1004
A.5 iSCSI initiator settings (single-path and MPIO)
This appendix contains recommended changes for iSCSI initiators. These changes apply to single-path and
MPIO configurations that use iSCSI to connect to SC Series storage.
Recommended iSCSI initiator registry settings location:
HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-BFC1-
08002BE10318}\<Instance Number>\Parameters
Setting name
Description
Default
value
Recommended
value
MaxRequestHoldTime
This is the maximum number of seconds
that requests are queued if connection to
the target is lost and the connection is
being retried. After this hold period,
requests will be failed with error no
device and device (disk) will be removed
from the system.
60
90
LinkDownTime
This value determines how long requests
will be held in the device queue and retried
if the connection to the target is lost. If
MPIO is installed this value is used. If
MPIO is not installed
MaxRequestHoldTime is used instead.
15
35
TCPConnectTime
Timeout given to TCP when a Connect
request is sent.
15
no change
TCPDisconnectTime
Timeout given to TCP when a Disconnect
request is sent.
15
no change
WMIRequestTimeout
Timeout value set for WMI requests such
as LoginToTarget or LogoutFromTarget,
SendTargets.
30
no change
DelayBetweenReconnect
If a connection is dropped while it is in
FullFeature phase, the driver will attempt
to re-login. This parameter sets the delay
between each re-login attempts.
5
no change
MaxConnectionRetries
Maximum number of times a lost TCP
connection will be retried.
4294967295
(indefinitely)
no change
MaxPendingRequests
This setting controls the maximum number
of outstanding requests allowed by the
initiator. At most this many requests will be
sent to the target before receiving
response for any of the requests.
255
no change
EnableNOPOut
If set to 1, the initiator will send NOP OUT
PDUs to target if there is no activity for 2
minutes.
0
1
MaxTransferLength
This is maximum data size of an I/O
request.
262144
(256KB)
no change