Thin Reclaimation

[rotorhead1]

All,

I would like to see if anyone is using Thin Reclaimation and how effectively it is working for you. Are you scheduling scripts on your servers to zero out space? If so how often are you doing this and are you seeing a load on the array when you do it.

I am doing some initial testing with Windows 2008r2 connected to a 7400-4. I am not having very much success with reclaiming the space. Test scenerio:

1. Created a 20GB TPVV
2. Presented (exported) to WindowsServer1 as drive T:
3. Filled the drive to 80% with data
4. Deleted 79% of data.
5. ran sdelete -z t:
6. sdelete completed successfully

The volume still shows 80% full. It's like the ascis are not seeing the zero'd space on the volume. Any suggestions?

jd

[Cleanur]

I'd do a search of the forum there are many similar questions, two things that you need to check is that you're using the right version of sdelete where the -Z does indeed generate zeroes and also that you are monitoring User Space rather than Reserved Space.

See this thread :-
viewtopic.php?f=18&t=516

Also take a look at the TP whitepaper which includes a script for reclaim
http://h20195.www2.hp.com/v2/GetPDF.asp ... 987ENW.pdf

[rotorhead1]

Great explaination. Thanks for sharing. Makes sense.

[trarun0483]

Hi I guess we need to have Thin Persistence license as well for the 3PAR to release the space after you run sdelete on host side to write zeros to unused spaces.