EMC VMAX 100K, Руководство по эксплуатации продукта

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Targetless snapshots
TimeFinder SnapVX management interfaces enable you to take a snapshot of an entire
VMAX3 Storage Group with a single command. With this in mind, VMAX3 supports up
to 16K storage groups, which is enough even in the most demanding environment for
one per application. The storage group construct already exists in the majority of
cases as they are created for masking views. Timefinder SnapVX is able to utilize this
already existing structure reducing the administration required to maintain the
application and its replication environment.
Creation of SnapVX snapshots does not require you to preconfigure any additional
volumes, which reduces the cache footprint of SnapVX snapshots and simplifies
implementation. Snapshot creation and automatic termination can easily be scripted.
In the following example, a snapshot is created with a 2 day retention. This command
can be scheduled to run in as part of a script to create multiple versions of the
snapshot, each one sharing tracks where possible with each other and the source
devices. Use a cron job or scheduler to run the snapshot script on a schedule to create
up to 256 snapshots of the source volumes; enough for a snapshot every 15 minutes
with 2 days of retention:
symsnapvx -sid 001 -sg StorageGroup1 -name sg1_snap establish -ttl -
delta 2
If a restore operation is required, any of the snapshots created by the example above
can be specified.
When the storage group transitions to a restored state, the restore session can be
terminated. The snapshot data is preserved during the restore process and can be
used again should the snapshot data be required for a future restore.
Secure snaps
Introduced with HYPERMAX OS 5977 Q2 2017 SR, secure snaps is an enhancement to
the current snapshot technology. Secure snaps prevent administrators or other high-
level users from intentionally or unintentionally deleting snapshot data. In addition,
Secure snaps are also immune to automatic failure resulting from running out of
Storage Recourse Pool (SRP) or Replication Data Pointer (RDP) space on the array.
When creating a secure snapshot, you assign it an expiration date/time either as a
delta from the current date or as an absolute date. Once the expiration date passes,
and if the snapshot has no links, HYPERMAX OS automatically deletes the snapshot.
Prior to its expiration, Administrators can only extend the expiration date - they
cannot shorten the date or delete the snapshot. If a secure snapshot expires, and it
has a volume linked to it, or an active restore session, the snapshot is not deleted;
however, it is no longer considered secure.
Note
Secure snapshots may only be terminated after they expire or by customer-authorized
EMC support. Refer to Knowledgebase article 498316 for additional information.
Provision multiple environments from a linked target
Use SnapVX to provision multiple test, development environments using linked
snapshots. To access a point-in-time copy, create a link from the snapshot data to a
host mapped target device.
Native local replication with TimeFinder
96 Product Guide VMAX 100K, VMAX 200K, VMAX 400K with HYPERMAX OS