Ingest Rate > Network Bandwidth
Example:
100 GB = Size of Weekly Full Backups
8 = Number of Hours in Backup Window
100 = Maximum Sustained Network Bandwidth (MB/Sec)
3.55 / 100 = .035Rounded Up to Next Whole Number = 1 NetVault SmartDisk Instance
Deduplication Rate < Ingest Rate
Use the following to estimate the Deduplication Rates:
Example:
100 GB = Size of Weekly Full Backups
10% = Weekly Full Backup Growth Rate
6 = Number of Daily Backups between Full Backups
24 = Number of Hours in Daily Deduplication Window
50 = Deduplication Rate (MB/Sec)
(163840/518400)/50) = .0063Rounded Up to Next Whole Number = 1 NetVault SmartDisk Instance
Determining the required number of NetVault SmartDisk Instances
Example:
Determining the required disk space for NetVault SmartDisk Instances
The Total Required Disk Space is divided into the Staging Store and the Chunk Store. If you intend to use different file systems or disks for the Staging Store and the Chunk Store, it is important to know how much of the Total Required Disk Space is allocated to the Staging Store versus the Chunk Store. Use the following calculations to determine this amount.
During the NetVault SmartDisk Deduplicated Backup process, backups are initially streamed to the Staging Store where they remain until the deduplication process is finished. The Staging Store must be large enough to hold all the backups while they await deduplication.
If the deduplication window overlaps the backup window, deduplication and backups occur at the same time. Each backup starts deduplicating after the backup job is finished. Also, large backups are broken into 400 GB segments. Each segment starts to deduplicate after it is received, even if the backup stream is still being streamed to the Staging Store. Therefore, the Staging Store only requires space to hold some portion of the total backup size. If the Staging Store runs out of space, vRanger backups fail.
Staging Store size
The maximum disk space required for the Staging Store is equal to the Size of the Weekly Full Backups.
Calculating Chunk Store size
The amount of physical disk space required for the Chunk Store is equal to the Unique Data Size. To calculate the Unique Data Size or the size of the Chunk Store, use the following formula:
Example:
100 GB = Size of Weekly Full Backups
12 = Weekly Full Backup Retention Period in Weeks
4 = Daily Backup Retention Period in Weeks
6 = Number of Daily Backups between Full Backups
100 + (120) + (240) = 460 GB
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