Special Facilities For Windows Systems - Hitachi VSP F1500 User And Reference Manual

• S-VOL side must close the logical drive corresponding to a [-g name]
before issuing the raidscan -find sync command.

Special facilities for Windows systems

CCI provides the following special facilities for Windows systems:
• Signature changing facility for Windows systems on page 8-9
• GPT disk for Windows on page 8-10
Signature changing facility for Windows systems
Consider the following Microsoft Cluster Server (MSCS) configuration in which
a MSCS P-VOL is shared from MSCS Node1 and Node2, and the copied
volume of S-VOL is used for backup on Node2. If the Node2 has reboot on
standby state, then MSCS of Node2 has a problem to assign drive letter of S-
VOL with previous P-VOL drive letter. This problem will happen on Node2 on
MSCS environment as shown in the following figure. The conditions are:
• Node1 is active.
• Node2 is standby state where P-VOL on Node2 is hidden by MSCS, and
reboots the Node2.
Figure 8-4 Configurations with MSCS and ShadowImage (HOMRCF)
MSCS on Node2 will misunderstand the S-VOL as MSCS cluster resource,
because the signature of S-VOL and P-VOL is the same due to copied. The
reason is that MSCS cluster resources are managed with the signature only.
Therefore S-VOL of Node2 will unable to backup so that MSCS of Node2 carry
away the S-VOL. This is a problem of MSCS service because Windows system
does change the signature through reboot if the same signature is detected
on NO MSCS service. MSCS will not accommodate LUNs with duplicate
signatures and partition layout. The best way to avoid such problems is to
transport to another host outside the cluster, but this enforces to set up a
backup server, so CCI supports a facility to put back the signature as a
second way.
The signature can be changed by using the dumpcfg.exe command attached
to Windows resource kits, but if the S-VOL is created with the Noread option
and the system is rebooted, then the dumpcfg.exe command will fail to
change the signature, because the system does not know the signature and
volume layout information for S-VOL.
Examples of using CCI commands
Command Control Interface User and Reference Guide
8-9