General Chat Thread, Deduplication - anyone else using it? in General; Originally Posted by sonofsanta
But... but... the interface!
*cough* mmc *cough*...
15th April 2013, 01:17 PM #16
*cough* mmc *cough*
Originally Posted by sonofsanta
15th April 2013, 01:38 PM #17
I know, I know... really I should just get on with server core and do the job properly. In my more conspiratorial moments I have suspected that this is Microsoft's intention, and that server core itself is a plan to boost the numbers taking MS certification.
16th April 2013, 09:36 PM #18
- Rep Power
Just to give you some quick results from some fileservers - just because some beat the 28%. Need to do some CPD on the need not to copy from the shared area to my documents! Obviously big advantages up front - has anyone come across any downsides?
Processed files: 331578
Processed files size: 539.95 GB
Optimized files size: 328.72 GB
Space savings: 211.17 GB
Space savings percent: 39
Processed files: 117387
Processed files size: 200.52 GB
Optimized files size: 126.07 GB
Space savings: 74.43 GB
Space savings percent: 37
Processed files: 150567
Processed files size: 298.56 GB
Optimized files size: 223.50 GB
Space savings: 75.05 GB
Space savings percent: 25
17th April 2013, 09:28 AM #19
I'm not sure if it is a downside or not, we are looking at putting all our file shares on one drive on one server to get the most out of deduplication. We run a hyper-v environment so really this shouldn't have any performance impact compared to on 2 different virtual servers and 4 different virtual drives at the moment.
Just feels like adding a single point of failure, but really it isn't I guess!
18th April 2013, 03:27 PM #20
Just poked around on one of ours (2008R2, running SIS) and it's quite effective.
18th April 2013, 03:31 PM #21
There is a downside to deduplication, and to SIS. If a sector becomes corrupt for whatever reason, and it happens to be a file (SIS) or 'chunk' of a file (Deduplication) that has multiple copies across the disk, you end up losing all those copies.
But then, we all have backups!
18th April 2013, 03:43 PM #22
Got 24% on a 1.5Tb fileserver, was hoping for more. Obviously staff don't copy the things into different folders as much as I thought they did
Originally Posted by localzuk
18th April 2013, 03:45 PM #23
25% is about right for user files according to Microsoft's guides. Up to 50% for shared areas. 75% for software deployment areas and 90% for VHDs.
4th May 2013, 09:02 PM #24
I have enabled this in production now. But when i look at the disks in Server Manager i can see a deduplication rate of 30% i right click and refresh it changes to say 28%. I refresh it again and it goes back up to 31%. Why is it so erratic, changing the figures in seconds? Will it settle down?
4th May 2013, 09:52 PM #25
Tell me more... Sedum
Originally Posted by RTFM
4th May 2013, 11:30 PM #26
Checked the machine two weeks later and the 25% has gone up to 38%. Does it improve over time?
Originally Posted by localzuk
5th May 2013, 12:52 PM #27
The process is done via a pair of scheduled tasks each night. I believe they have a limit of how long they run for each night also. So, yes, the values can go up over time as it optimises more and more.
I have come across a slight issue with backups. Backing up using BackupAssist seems to have issues with the hard links that are used, and the backups often just end up as a bunch of 4k files rather than the actual files.
5th May 2013, 03:15 PM #28
This seems to have stopped overnight.
Originally Posted by FN-GM
5th May 2013, 05:25 PM #29
Our Veeam setup makes great use of dedupe for the backups. I forget the ratio now but it helps a lot, not just for storage but also (because this is source dedupe) in terms of how much data we have to transfer over the wire for our offsite backups to another school a few miles up the road.
29th May 2013, 09:23 AM #30
- Rep Power
what command did you run to get that info? Also is there a way to list the most duplicated files?
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