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Backup Encryption Overhead

Hi


We are testing backup encription using BUE 2012 3600 appliance and are noticing some significant overheads of the encryption.

Can anyone advise it there and any published statistics of what overhead is realisitc.

 

 Applaince is:

Windows 2008 Server

BUE 2012 with SP2 installed

4 CPU

16GB RAM

4 x 1GB NIC but with only 1 in use

Attached HP MSL 2024 tape library SAS attached

 

Out test results to local appliance disk are as below:

 

Job type – D2D

Time mins

Throughput mps

%Overhead

Non encrypted or compressed

Encrypted – Software compression – 25gb – small files – disk1

28.21

1,225,00

+45.8

Encrypted – No compression – 25gb – small files – disk1

21.51

1,677,00

+6.16

Not Encrypted – Software compression – 25gb – small files – disk1

19.35

1,733,00

3

Not Encrypted – No compression – 25gb – small files – disk1

18.23

1.786,00

 

 

 

 

Job type – Duplicate to tape

Time mins

Throughput mps

%Overhead

Non encrypted or compressed

Encrypted – Software compression

57.47

894

+255

Encrypted – No compression

38

916

+248

Not Encrypted – Software compression

44

1,495,00

+35

Not Encrypted – No compression

18.55

2,283,00

 

Any thoughts or documentation (other than admin guide) would be appriciated

 

 

1 Solution

Accepted Solutions
Accepted Solution!

When you encrypt your

When you encrypt your backups, there is definitely overheads and it can be significant.  This is why you should use encryption sparingly.  I only encrypt the backups that goes off-site.

You should always use either software encryption and software compression or hardware encryption and hardware compression.  Do not mix software encryption with hardware compression or hardware encryption with software compression.  If you are using LTO4 tapes, then you can use hardware encryption and hardware compression when you backup to tapes.

If you are backing up to the appliance internal harddisk which is a dedup folder, then you should not use any encryption or compression as these dedup badly.

View solution in original post

2 Replies

Hi,   I haven't seen anything

Hi,

 

I haven't seen anything on the Symantec site or in the admin guide around this...I suspect it is going to be very technical and therefore doesn't warrant inclusion.

I'd suggest logging a call with Symantec around this, and then reporting back with the information for anybody else looking for it in future.

Thanks!

Accepted Solution!

When you encrypt your

When you encrypt your backups, there is definitely overheads and it can be significant.  This is why you should use encryption sparingly.  I only encrypt the backups that goes off-site.

You should always use either software encryption and software compression or hardware encryption and hardware compression.  Do not mix software encryption with hardware compression or hardware encryption with software compression.  If you are using LTO4 tapes, then you can use hardware encryption and hardware compression when you backup to tapes.

If you are backing up to the appliance internal harddisk which is a dedup folder, then you should not use any encryption or compression as these dedup badly.

View solution in original post