networkn

Performance issues with RAID0

7 posts in this topic

Hi There!

I run a 4770K, with 16GB, and 3 x 500GB 840 EVO SSD's in a RAID 0 using the Intel Raid 10 built into my Asus motherboard.

I have noticed a lot lately that extracting video's from multipart rar files is so much slower than I'd expect with it taking around 15 seconds to extract a 4.7GB video file from a group of 47 100MB Rar Files to the same directory. It's a feeling that the system feels sluggish. If I open a 1.2GB video file by double clicking it in explorer, by the time it starts playing there is about 3-4 seconds.

When i compare this to my 850 Pro PCIE M.2 SSD, where it's practically instant, it feels quite like there is something "not quite right".

I do understand that there is about double the speed on my M.2 setup, but just playing a 1.2GB file on a 840 Raid 0 should be pretty much instant.

I then grabbed AS SSD Benchmark and with 3GB selected on the RAID 0 partition 3, the SEQ Read is 1376MB/s Write 1194MB/s, 4K is 36/90MB/s and score overall was 1234.

Any ideas if I should be concerned or what i should be checking to ensure I am fully optimized.

I'd like to say this is an issue I felt has only occurred since I upgraded to W10.

Share this post


Link to post
Share on other sites

Are you experiencing the classic 840 EVO long term performance degradation? Are you on the latest 840 EVO firmware and running the optimization every few months to clean it up?

Share this post


Link to post
Share on other sites

> SEQ Read is 1376MB/s

1,376 / 3 = 458 MB/s which is par for those SSDs and a RAID 0 setup

allowing for controller overhead and normal degradation.

Did you run the same test when those SSDs were brand new?

For a close comparison, here's the ATTO result we obtained

with 4 x Samung 840 Pro SSDs in a RAID-0 array:

4xSamsung.840.Pro.SSD.RR2720.P5Q.Deluxe.

1,846 / 4 = 461 MB/second

/s/ Paul

Share this post


Link to post
Share on other sites

Are you experiencing the classic 840 EVO long term performance degradation? Are you on the latest 840 EVO firmware and running the optimization every few months to clean it up?

Is it possible while these drives are in RAID0, to firmware update them? I haven't done any firmware updates for a long time, maybe not since they were put into service.

Can the cleanup be run whilst in RAID0?

If they can't be done in RAID 0, is connecting them 1 at a time in another machine, then upgrading them, "cleaning" them and putting them back into their original config, likely to result in a working raid 0 set?

Share this post


Link to post
Share on other sites

Ugh, I haven't done any 840 EVO firmware upgrades in a very long time, so honestly I wouldn't trust my memory. You're going to have to read one of many articles on the firmware upgrade process to get a feel for that.

Share this post


Link to post
Share on other sites

Managing your expectations is also worthwhile.

Let's just say that you do succeed in increasing

your average MB/s per SSD to 500.

Then: 500 / 458 = 1.091 -or- less than 10% (exactly 9.1%).

You might not even notice an improvement

that is less than 10% better than the 458 you

already measured.

I seriously doubt that you could increase

your average too much above 500 per SSD.

I predict that you would be better off by

adding a fourth array member and,

while you are in the middle of that upgrade,

be sure that:

( a ) your logical array is "aligned":

Partition Wizard freeware will do that

correctly for you, if your logical array

is NOT already aligned;

( b ) make sure the latest firmware

is correctly installed in each array member;

( c ) run Samsung's latest software to make

sure that each array member is "optimized";

( d ) make sure your chipset driver is

also updated to the latest version.

The latter point is non-trivial because

you do want TRIM to work if your motherboard's

chipset is managing your RAID array.

Assuming you are booting from a backup partition

while you are re-configuring your RAID array of SSDs,

Partition Wizard also has a very nice "Migrate OS" feature

which will transfer your backup OS to your optimized RAID array.

https://www.partitionwizard.com/

Edited by MRFS

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now