A RecoverPoint consistency group is a data set of SAN-attached storage volumes at
the production site and DR site. An SRM protection group is a group of virtual
machines that are failed over together (during testing and actual failover). When SRM
performs failover, it instructs RecoverPoint to operate on all the LUNs of all the VMs in
the protection group. RecoverPoint, on the other hand, uses consistency groups to
define groups of LUNs that are replicated together. Therefore, it is recommended to:
• Group
all
SRM protection group LUNs into a single or a small number of
RecoverPoint consistency groups. This grouping is to prevent SRM protection
group LUNs from being left out of RecoverPoint consistency groups. If
RecoverPoint is monitoring the Virtual Center at the SRM protection site, then any
virtual machines that have LUNs that are not part of a RecoverPoint consistency
group will be shown as partially or unprotected.
• Ensure RecoverPoint consistency groups containing SRM protection group LUNs
do
not
contain non-SRM protection group LUNs. Otherwise, if such LUNs are
added to the RecoverPoint consistency group, they will be handled by SRM.
• Ensure RecoverPoint consistency groups containing SRM protection group LUNs
do
not
contain LUNs from more than one SRM protection group. Otherwise, SRM
may attempt to operate on the same consistency group concurrently. This may
cause SRM operations to fail, or to behave erratically. When these guidelines are
followed then in the event of a failure at the protected site, SRM will fail over
production to the protected site. As part of this event, SRM:
! Automates failover of the EMC RecoverPoint consistency group(s)
! Has RecoverPoint roll the physical volume(s) to the last image replicated from
the production site
! Has RecoverPoint resume production for the consistency group(s) at the
temporary production site. This ensures that any changes to the production
volumes at the temporary production site are replicated back to the original
production site
! Rescans and adds the datastores that reside on the volumes contained within
the RecoverPoint consistency groups
! Registers and powers on the virtual machines at the protected site
These virtual machines become the temporary production data center as shown in
Figure 9.
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