HP D2D D2D Best Practices for VTL, NAS and Replication implementations (EH985- - Page 56

Summary of possible seeding methods and likely usage models Technique Best for Concerns Seed over the WAN link Active -- Passive and Many to 1 replication models with: Initial Small Volumes of Backup data OR Gradual migration of larger backup volumes/jobs to D2D over time As an example, the first 500GB full backup over a 5Mbit link will take 5 days (120 hours) to seed on a D2D2502 Backup System. This type of seeding should be scheduled to occur over weekends where at all possible. Co-location (Seed over LAN) Floating D2D Backup application Tape offload/ copy from source and copy onto target Active -- Passive, Active -- Active and Many to 1 replication models with significant volumes of data (> 1TB) to seed quickly and where it would simply take too long to seed using a WAN link ( > 5 days) This process can only really be used as a ―one off‖ when replication is first implemented. Many to 1 replication models with high fan in ratios where the target must be seeded with several remote sites at once. Using the floating D2D approach means the device is ready to be used again and again for future expansion where more remote sites might be added to the configuration. Suitable for all replication models, especially where remote sites are large (inter- continental) distances apart. Well suited to target sites that plan to have a physical Tape archive as part of the final solution. Best suited for D2D VTL deployments. As an example, the first 500GB full backup over 1 GbE link (LAN) link will take 3.86 hours on a D2D2502 Backup System. This process involves the transportation of complete D2D units. This method may not be practical for large fan-in implementations e.g. 50:1 because of the time delays involved in transportation. Careful control over the device creation and co-location replication at the target site is required. See example below. Relies on the backup application supporting the copy process, e.g. Media copy or ―object‖ copy‖ Use of portable disk drives backup application copy or drag and drop USB portable disks, such as HP RDX series, can be configured as Disk File Libraries within the backup application software and used for ―copies‖ OR Backup data can be drag and dropped onto the portable disk drive, transported and then drag and dropped onto the D2D Target. Best used for D2D NAS deployments. Multiple drives can be used - single drive maximum capacity is about 2TB currently. Comments Seeding time over WAN is calculated automatically when using the StorageWorks Backup Sizing tool for D2D. It is perfectly acceptable for customers to ask their link providers for a higher link speed just for the period where seeding is to take place. Seeding time over LAN is calculated automatically when using the StorageWorks Backup Sizing tool for D2D This is really co-location using a spare D2D. The last remote site D2D can be used as the floating unit. Reduced shipping costs of physical tape media over actual D2D units. Requires physical tape connectivity at all sites, AND media server capability at each site even if only for the seeding process. Backup application licensing costs for each remote site may be applicable USB disks are typically easier to integrate into systems than physical tape or SAS/FC disks. RDX ruggedized disks are OK for easy shipment between sites and cost effective. 56