HPE Storage Users Group

Hi,



I just upgraded a customers brand new 7200c which contains 12SSD's to 3.2.1MU2 - got the firmware directly from HP.

I know this updates fixes some issues with thin dedup.
I

What are your thoughts and experience with Thin Dedup so far, is it production ready?
Since its a pretty new feature I am a bit concerned about how mature it is?

MU2 has just been released, so it is hard to say.

Why not put it to the test with non-production data first for a coulpe of weeks?
That way the code can prove itself for you.

_________________
The goal is to achieve the best results by following the clients wishes. If they want to have a house build upside down standing on its chimney, it's up to you to figure out how do it, while still making it usable.

What are your SSD models ?
Some are not eligibles to dedup...

huh? i think you are mixing up AFC and dedup here?

_________________
The goal is to achieve the best results by following the clients wishes. If they want to have a house build upside down standing on its chimney, it's up to you to figure out how do it, while still making it usable.

That's what i thought when i read your post about cMLC 480GB SSD and AFC...
My mistake ^^

Take this for what it is worth. We purchased the 7200c's w/ 10 1.92 TB SSD drives each in order to run our existing VDI environment. We would run about 20,000 IOps using thin provisioning and dedupe. At the time we were running 3.2.1 mu1 with patches. The problem we ran into was that the CPU on the 7200's could not keep up with the dedupe and we would see big latency spikes. When we switched back to just thin things were fine. Since we still wanted the dedupe we rectified it by swapping the heads with 7450's using the same 10 SSDs and are now running fine. We are also now running MU2.

I'd be more concerned about the CPU keeping up than the dedupe software itself. The 7450 and 7440c's have more cores for that reason.

Hi mitchellm3

Hope I'm not hijacking this thread as we are also also experiencing what i believe to be slowness with the 3Par due to deduce, we have just deployed a new 7200 all flash array with 8 x 480 GB Mlc drives and seem to be getting very slow transfer times while migrating data to the 3Par, the Equallogic streaming the data is showing very low IO usage.

Do you think the slow transfer speed is due to Deduplication? strange as we are not seeing any CPU activity via 3Par Management Console just very slow migration of data to the 3Par.

would be interested in opinions.

ta
Gerardo

Deleted

Can you quantify slow? what speeds do you see exactly
maybe you could post a:
- showport -host -iter 3 -d 30
- statcmp -iter 3 -d 30
- statpd -p -devtype SSD -iter 3 -d 30

(every command will take 90 seconds to complete)
all ran during the migration ofcourse

_________________
The goal is to achieve the best results by following the clients wishes. If they want to have a house build upside down standing on its chimney, it's up to you to figure out how do it, while still making it usable.

Hi,

We are running thin dedupe in production on a 7450, with 24 1.92GB cMCL drives. Not seeing any issues to date, I believe we have upgraded twice since November to address some dedupe related features.

Dedupe VMFS volumes 2:1 saving so far.

Davie