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 GB = Size of Weekly Full Backups
8 = Number of Hours in Backup Window
100 = Maximum Sustained Network Bandwidth (MB/Sec)
Rounded Up to Next Whole Number = 1 NetVault SmartDisk Instance
Use the following to estimate the Deduplication Rates:
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)
Rounded Up to Next Whole Number = 1 NetVault SmartDisk Instance
A single factor determines the number of Nondeduplicated NetVault SmartDisk Instances:
100 GB = Size of Weekly Full Backups
8 = Number of Hours in Backup Window
100 = Maximum Sustained Network Bandwidth (MB/Sec)
Rounded Up to Next Whole Number = 1 NetVault SmartDisk Instance
100 GB = Size of Deduplicated Weekly Full Backups across all servers
12 = Weekly Full Backup Retention Period in Weeks
10 GB = Size of Deduplicated Weekly Daily Backups
6 = Number of Daily Backups between Full Backups
4 = Daily Backup Retention Period in Weeks
10 GB = Size of Nondeduplicated Weekly Full Backups
12 = Weekly Full Backup Retention Period in Weeks
1 GB = Size of Nondeduplicated Daily Backups
4 = Daily Backup Retention Period in Weeks
6 = Number of Daily Backups between Full Backups
Total Required Disk Space = Deduplicated Backup Disk Space + Nondeduplicated Backup Disk Space
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.
The amount of time a Deduplicated Backup remains in the Staging Store is different than the amount of time a Nondeduplicated Backup remains in the Staging Store. Therefore, to determine the total disk space required for the Staging Store, you must calculate the size required for both Deduplicated Backups and Nondeduplicated Backups.
Total Staging Store Disk Space = Deduplicated Backup Disk Space + Nondeduplicated Backup Disk Space
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 Deduplicated 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, backups pause until space becomes available, such as when a deduplication operation finishes.
The maximum disk space required for the Staging Store is equal to the Size of the Weekly Full Backups.
Backups that are not deduplicated are streamed into the Staging Store, where they remain until they are retired. Therefore, calculating the size of the Staging Store for Nondeduplicated Backups is identical to calculating the required physical disk space for Nondeduplicated Backups in a Deduplicated NetVault SmartDisk Instance.
10 GB = Size of Nondeduplicated Weekly Full Backups
12 = Weekly Full Backup Retention Period in Weeks
1 GB = Size of Nondeduplicated Daily Backups
6 = Number of Daily Backups between Full Backups
4 = Daily Backup Retention Period in Weeks
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:
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
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