Dell POWEREDGE R710 - Manual (Page 13)

Dell HPC Tiered Storage Solution
Page 11
User scenarios for tiered storage solution
This section describes some key user scenarios that are verified and supported with the Dell TSS
solution. This section is not a comprehensive list, but rather a list of key user scenarios that Dell TSS
supports.
Migration policies
The storage administrator can set policies to migrate data from a user home directory on the primary
tier to long-term storage (LTS) tier. In the case of an HSM operation, Dell verified that a stub file for
persistent recall of migrated data was created after the migration of the data blocks. In the case of an
Archive operation, Dell verified that migrated data is no longer available and a stub file for data was
not generated on the originating tier. Some policies that were verified include, but not limited to:
 Policy to migrate files that are 7 days or older from last modify or last access date.
 Policy to migrate files that are larger than 1GB in size.
 Policy to migrate files that are larger than 500MB to tape based LTS while files that are less than
500MB to disk based LTS.
 Policy to trigger migration jobs when primary file system utilization reached 80% peak.
The storage administrator can set policies to migrate or archive data according to the user, group or
parent folders of the data. This includes creating different policies for different groups.
The storage administrator can avoid overloading on the data management system (CommVault) if
multiple users try to recall large amounts of data. You can accomplish this by setting recall throttling
parameters when creating sub-client(s) and associated policies.
 Maximum Stub Recovery (limit)
 Time between Recall to Count as Successive in Seconds (interval)
 Time to Wait after Maximum Successive Recalls Limit is Reached in Seconds (cool-down)
Data protection levels
The storage administrator, using policies, can make multiple copies of user data. The policy can
determine which directories or files are copied to multiple locations, providing a way for users to
protect their data accordingly. You can achieve this task through use of the Auxiliary Copy feature of
Simpana 9 and can specify recovery from specific LTS tier through the Copy Precedence settings in
the Storage Policy Properties.
(5) For example, a policy can:
 Migrate data in /home/userX/redundant-copy on Primary tier (using either HSM or Archive) and
move copies of the data on two separate LTS tiers.
 While data outside of /home/userX/redundant-copy on Primary tier can be migrated to only a
single instance on LTS tier.
Data backup and recovery
The storage administrator can create policy to generate a full backup of the primary storage tier. You
can use this backup to recover user data in the event of a disaster. To accomplish this task, perform a
full system backup of the primary storage tier data and then a full system restore of the data.