Filter
Top Products
314 Chapter 4 Performing CCI Operations
4.19 Special Facilities for Windows 2008/2003/2000 Systems
CCI provides the following special facilities for Windows 2008/2003/2000 systems:
Signature changing facility (section 4.19.1)
Directory mount facility (section 4.19.2)
4.19.1 Signature Changing Facility for Windows 2008/2003/2000 Systems
Consider the following Microsoft Cluster Server (MSCS) configuration in which a MSCS PVOL is
shared from MSCS Node1 and Node2, and the copied volume of SVOL 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 SVOL with previous PVOL drive letter. This problem will happen on
Node2 on MSCS environment as shown in Figure 4.78. The conditions are:
Node1 is active.
Node2 is standby state that PVOL on Node2 will be hidden by MSCS, and reboots the
Node2.
P-VOL
Sig
N
ode 1
MSCS
S-VOL
Sig
N
ode 2
MSCS + Backup
ShadowImage
(HOMRCF)
Figure 4.78 Configurations with MSCS and ShadowImage (HOMRCF)
MSCS on Node2 will misunderstand the SVOL as MSCS cluster resource, because the signature
of SVOL and PVOL is the same due to copied. The reason is that MSCS cluster resources are
managed with the signature only. Therefore SVOL of Node2 will unable to backup so that
MSCS of Node2 carry away the SVOL. This is a problem of MSCS service because Windows
system does change the signature through reboot if the same signature will be 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 will be able to change by using “dumpcfg.exe” command attached to
Windows resource kits, but if the SVOL is created with “Noread” option and the system is
rebooted, then “dumpcfg.exe” command will fail to change the signature, because the
system does not know the signature and volume layout information for SVOL.