Dell DR4100 Symantec NetBackup - Setting up the DR Series System on Symantec N - Page 83

B.1.3 VTL default account summary table Service NDMP iSCSI Account ndmp_user Default Credentials St0r@ge! St0r@ge!iscsi CLI Modifier ndmp --setpassword iscsi--setpassword B.2 Managing VTL media and space use B.2.1 General performance guidelines for DMA configuration The DR Series system version 3.2 (and later) provides inline VTL deduplication, compression, and encryption at rest. Backup Applications (such as Dell NetVault, Symantec BackupExec, Symantec NetBackup, etc) should be configured so that any multiplexing, pre-compression, software side deduplication or encryption is disabled. Enabling any of these features may adversely affect the space savings and ingest performance of the DR Series Appliance VTL feature. Slots and media should be configured so as to accommodate the environment backup requirements. Initially the logical capacity of a VTL should be no more than twice the physical size of the DR Series Appliance. If the initial VTL setup is oversubscribed at a higher than a 2-1 ratio without proper planning the DR Series Appliance could fill up prematurely and cause unexpected system outage. It is highly advisable to configure the DR Series Appliance VTL such that the media count be made to accommodate the customer's initial logical data protection requirements and then media be added as the deduplication statistics become available to ascertain growth, media and space requirements. Media Type selection will depend on a number of factors including the DMA used, the backup cycles and data sources to name a few. As a general rule using smaller tapes is better than using larger tapes so as to allow for a higher level of control over space usage by backup operations. This also allows for easier handling in the event of a system running out of physical space as well as the normal data cleanup procedures. Adding media to an existing DR Series Appliance VTL is painless and should be leveraged to incrementally add media as needed. Although this may require a higher level of involvement in managing the media usage it will result in better performance and avoid unplanned outages. B.2.2 Physical DR space sizing and planning Various factors such as total data footprint, change rate, backup frequency and data lifecycle policies will dictate how much physical space will be needed to accommodate the Virtual Tape Libraries within a DR environment. In addition if other container types are hosted these two must be factored into space requirement calculations. As a general rule the following can be used as a reference to determine the basic capacity needed for a given virtual tape library container: 1. Determine existing data set 2. Determine the change rate (Differential) 3. Determine the retention period 83 Setting up the Dell™ DR Series System on Symantec™ NetBackup™ | July 2015