Acronis Backup for Windows Server Essentials - User Guide - Manual (Page 230)

230 Copyright © Acronis International GmbH, 2002-2014

The disk space required for a deduplication database can be estimated by using the following
formula:
S = U / 32 + 10
where
S – disk size, in GB
U – planned amount of unique data in the deduplication data store, in GB.
For example, if the planned amount of unique data in the deduplication data store is U=5 TB, the
deduplication database will require the free disk space not less than
S = 5*1024 / 32 + 10 = 170 GB
Selecting a disk for a deduplicating vault
For the purpose of data loss prevention, we recommend using RAID 10, 5 or 6. RAID 0 is not
recommended since it not fault tolerant. RAID 1 is not recommended because of relatively low speed.
There is no preference to local disks or SAN, both are good.
16 GB of RAM per 1 TB of unique data
This is a recommendation for a worst case scenario. It is not necessary to follow this
recommendation if you do not experience a deduplication performance problem. However, if the
deduplication is too slow, adding more RAM to the storage node may significantly raise the
deduplication speed.
In general, the more RAM you have, the greater the deduplication database size can be, provided
that the deduplication speed is the same.
Only one deduplicating vault on each storage node
It is highly recommended that you create only one deduplicating vault on a storage node. Otherwise,
the whole available RAM volume will be distributed in proportion to the number of the vaults.
64-bit operating system
The storage node must be installed in a 64-bit operating system. The machine with the storage node
should not run applications that require much system resources; for example, Database
Management Systems (DBMS) or Enterprise Resource Planning (ERP) systems.
Multi-core processor with at least 2.5 GHz clock rate
We recommend that you use a processor with the number of cores not less than 4 and the clock rate
not less than 2.5 GHz.
Sufficient free space in the vault
Indexing of a backup requires as much free space as the backed-up data occupies immediately after
saving it to the vault. Without a compression or deduplication at source, this value is equal to the size
of the original data backed up during the given backup operation.
High-speed LAN
1-Gbit LAN is recommended. It will allow the software to perform 5-6 backups with deduplication in
parallel, and the speed will not reduce considerably.