HP Brocade 8/12c Release Note page 7

Mac server sleep mode
The ATTO Mac iSCSI Initiator does not support Mac server sleep mode. If sleep mode is enabled,
and the Mac server goes to sleep, the initiator can lose iSCSI connectivity to the logical unit numbers
(LUNs).
If the ATTO Mac iSCSI Initiator is installed, disable Mac server sleep mode.
Windows drops the IP connection
Certain I/O workloads can cause Windows to drop the IP connection, resulting in removal of a LUN.
To restore the IP connection, reboot the system. To avoid dropped connections:
Reduce the I/O workload.
Reduce the application transfer size.
Windows iSCSI Initiators must add Tcp1323Opts to registry
If you use a method other that the HP StorageWorks MPX200 Multifunction Router Windows software
kit to install the Windows iSCSI Initiator, you must manually add the Tcp1323Opts to the registry.
Timestamps enable TCP to accurately measure round-trip time (RTT) to adjust retransmission timeouts.
The timestamps option provides two 4-byte timestamp fields in the TCP header. One field records the
time of the initial transmission; the other field records the time on the remote host.
There are two methods to add Tcp1323Opts to the registry. HP recommends that you use the first
method.
IMPORTANT:
When you install the Windows iSCSI initiator from the HP StorageWorks MPX200 Multifunction Router
Windows software kit, Tcp1323Opts is added to the registry automatically.
Method 1
To enable timestamps, under HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\
Parameters, set the Tcp1323Opts entry to REG_DWORD = 2.
Method 2
CAUTION:
Use the Registry Editor at your own risk. Using it incorrectly can cause serious problems that require
reinstallation of the operating system. Be sure to back up the registry before making any changes.
Make the change to the registry, or cut and paste the following lines to a text file named
tcp1323opts.reg:
tcp1323opts.reg.
:
REGEDIT4
MPX200 Multifunction Router Release Notes 7