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What do you think: SSD & NTFS compression

post #1 of 10
Thread Starter 
Do you have any experience or thoughts on enabling NTFS compression on an SSD? Since SSDs are immune to fragmentation and have near-zero access times it looks like they are particularly suited to compression. Are there any obvious disadvantages like TRIM not working right?

On the web the few reviews and forum posts show a slight performance decrease due to the compression and talk about higher CPU loads. Some even say reads are faster, but it's doubtful. Space savings for a Win partition seem to be around 10-15%. However rarely any of these claims are supported by benchmarks or real world tests, so I'm turning towards the trusty OCN to gather facts.

If there's no major roadblock I intend to enable it on my X25M this evening and see how it goes. Thoughts? rolleyes.gif
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post #2 of 10
Enable it, run some tests and see what happens. thumb.gif
   
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post #3 of 10
Thread Starter 
Quote:
Originally Posted by asuperpower View Post

Enable it, run some tests and see what happens. thumb.gif

biggrin.gif riiight

Have you tried on your disk? I might on the X25v too if at goes well on the M
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post #4 of 10
Quote:
Originally Posted by dragosmp View Post

Have you tried on your disk?

Not yet... thumb.gif
   
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post #5 of 10
It will decrease performance. The data has to be uncompressed to be read and that slows it down.
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post #6 of 10
Thread Starter 
Quote:
Originally Posted by mcg75 View Post

It will decrease performance. The data has to be uncompressed to be read and that slows it down.

It is possible, though the rumor mill says nowadays CPUs are largely capable to support that decompression penalty redface.gif Any numbers?
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post #7 of 10
Thread Starter 
Update: to begin with I compressed my lappy's X25v, which although has only 40GB in total (39 more exactly) it also had half of it as free space.

The SSD is in excellent condition despite being used daily for 1.5years:452

Base ATTO performance (non-compressed):
494
The SSD had pre-compression 16.763GB free space out of 39.078GB. Compression took some 30mn and was mostly CPU limited (a K8 class 2x2.3GHz processor). Compressed it was 19.818GB, so 3.055GB more - 15.4% compression. The hyberfil.sys annoyingly wasn't compressed...
Atto results compressed:
505

Whoa, better than a Vertex 3?! At low file sizes the write speed decreased significantly, but the read speed is amazing. As a sanity check I ran some PCMark07:
Stock_____ ||| Lightweight 2250 ||| Storage 4000
Compressed ||| Lightweight 1671 ||| Storage 2505
However PCMark aside from being storage intensive, it's also very CPU intensive and during storage tests the CPU was maxed. Clearly the compression added processing overhead which isn't handled well enough in PCMark.

That's about it for now. Real world usage isn't any different, no negative effect for now. The only fact I say for sure is that based on these compression rates the gain is about 6GB in total over the whole disk's capacity which isn't bad. More tests incoming later today on this X25v (suggestions appreciated) and a few on the X25M.

*EDIT: The random spikes in Atto may be due to rogue processes, please ignore. If necessary I can run these tests properly with all distractions turned off, but for now they'll paint a clear enough picture.
Edited by dragosmp - 12/1/11 at 10:41pm
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post #8 of 10
Tom's did a whole story on this yesterday.

http://www.tomshardware.com/reviews/ssd-ntfs-compression,3073.html

It does effect performance a bit and it increases writes to the drive.
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post #9 of 10
i have been reading articles this last weeks about this subject,

windows avoids compressing hibernation and page file, because they are io mapped and will cause problems if compressed, so no luck there

looks like universal consciousness exits as i'm seeing lots of threads about this, and now even tom hardware has a review on it. all in due time.
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post #10 of 10
Quote:
Originally Posted by dragosmp View Post

Do you have any experience or thoughts on enabling NTFS compression on an SSD? Since SSDs are immune to fragmentation and have near-zero access times it looks like they are particularly suited to compression. Are there any obvious disadvantages like TRIM not working right?
On the web the few reviews and forum posts show a slight performance decrease due to the compression and talk about higher CPU loads. Some even say reads are faster, but it's doubtful. Space savings for a Win partition seem to be around 10-15%. However rarely any of these claims are supported by benchmarks or real world tests, so I'm turning towards the trusty OCN to gather facts.
If there's no major roadblock I intend to enable it on my X25M this evening and see how it goes. Thoughts? rolleyes.gif

I've been able to realize triple space savings with NTFS using Drive Press (http://www.magicrar.com/drive-press.html). I think this also improves overall SSD performance, because there is more spare area available on the drive.

My average space savings are 20%-25% (but this is only after using Drive Press, which compresses more than Windows itself somehow).

TRIM is not an issue within Windows itself, but I employ the best practice of keeping the root of the drive clear so the temp file Intel's SSD Toolbox creates during manual TRIMs is not affected by drive compression.

So I have two 600 GB Intel SSDs on my system - one of them for my source codes, the other for my games. VMs are hosted on both SSDs (there's no RAID involved). The raw capacity of the SSDs is 558 GB. Both drives have 100 GB free space. The source code disk has 650 GB actual usage, the games disk has 550 GB actual usage.

For regular applications, there is no perceived slow-down at all. When I am running 4 VMs simultaneously though on VMware, and doing some heavy-lifting, there is a bit of a noticeable slow-down.
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