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4 10k drives raid 10 vs SSD - Page 2

post #11 of 19
Quote:
Originally Posted by thefreeaccount;13782797 
After two hours of continuous writes, a C300 drops to 15ms access time and 2k iops. Now imagine that sucker after a day a two. I'll stick with my spinners, thanks. =)

That being said...4 drives is really not that many, especially if you are concerned about write performance. With hard drives, it's the opposite of SSDs - you want to go with as many small drives as possible. 10 x 36GB / 15k / 2.5" would be a lot more impressive than 4 x 146GB / 10k / 3.5".

The only thing that can really match or exceed a decent sas array in performance is a ram disk.

2k IOPs is still more than you'll get from either of your SAS arrays...
post #12 of 19
Quote:
Originally Posted by Scorpii;13782869 
And I'm also pretty sure that SSDs are in fact much faster than RAID arrays, and you 'sticking with your spinners' isn't a wise move if you want the best performance...

SSD and RAID are not exclusive...

As I plan on proving as soon as I can justify $2k on SSDs.
 
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post #13 of 19
Quote:
Originally Posted by u3b3rg33k;13783320 
SSD and RAID are not exclusive...

As I plan on proving as soon as I can justify $2k on SSDs.

and what would you do with them? Because for 90+% of uses you'd be wasting upwards of $1700...
post #14 of 19
I plain don't trust storage devices. And striped SSDs is faster than not striped drives, striping yields a bigger drive... I'd only be "wasting" $500, as one of the drives is effectively (not literally) dedicated to parity.

Besides, my raid card is capable of "800 MB/sec RAID 5 reads and exceeds 380 MB/sec RAID 5 writes", so it's not like it'd be slow.
(source http://www.supermicro.cc/Datenblatt/9550SX.pdf)
 
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post #15 of 19
Quote:
Originally Posted by u3b3rg33k;13783571 
I plain don't trust storage devices. And striped SSDs is faster than not striped drives, striping yields a bigger drive... I'd only be "wasting" $500, as one of the drives is effectively (not literally) dedicated to parity.

Besides, my raid card is capable of "800 MB/sec RAID 5 reads and exceeds 380 MB/sec RAID 5 writes", so it's not like it'd be slow.
(source http://www.supermicro.cc/Datenblatt/9550SX.pdf)

You'd be wasting the money because you wouldn't be gaining any real-world speed.

And even with a hardware RAID card you wouldn't want to run RAID5 for your OS - the performance would be lower than with a single drive for most operations.
post #16 of 19
I run only raid 5 in my desktop, and it's definitely not slower than a single drive, but that's probably due to NCQ and the 128MB of cache. It is noticeably slower with the cache off (but why would I run like that?).

The controller also gets me a few other benefits:
I can swap out drives without powering down
I can grow the array by putting in bigger drives, without powering down, or re-installing the OS.
 
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post #17 of 19
Thread Starter 
Well thanks for the input guys. I guess my next build is going to be SSD for my main drive.
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post #18 of 19
Quote:
Originally Posted by u3b3rg33k;13791677 
I run only raid 5 in my desktop, and it's definitely not slower than a single drive, but that's probably due to NCQ and the 128MB of cache. It is noticeably slower with the cache off (but why would I run like that?).

The controller also gets me a few other benefits:
I can swap out drives without powering down
I can grow the array by putting in bigger drives, without powering down, or re-installing the OS.
What controller are you using?

RAID5 does tend to be slower than a single drive in the most important factors for an application and OS drive..... random read/write.
Quote:
Originally Posted by thefreeaccount;13782797 
After two hours of continuous writes, a C300 drops to 15ms access time and 2k iops. Now imagine that sucker after a day a two. I'll stick with my spinners, thanks. =)

The only thing that can really match or exceed a decent sas array in performance is a ram disk.
What are you doing that is do continuous writes/deletes/updates for that period? This is definitely non-typical desktop usage (but I suspect this is some server).

Depends on your performance metric. A SAS array might be good in sequential but a single SSD can destroy SAS arrays in random performance. In fact, an array of SSDs can destroy SAS in sequential as well. The peak sequential read of a SAS HDD is around 200MB/s last I checked. SSDs are hitting 500MB/s reads now.

An SAS array will not be able to keep up to a SSD in database selects.
Edited by DuckieHo - 6/9/11 at 8:03am
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post #19 of 19
Quote:
Originally Posted by DuckieHo;13809312 
An SAS array will not be able to keep up to a SSD in database selects.

http://www.hardwarezone.com/tech-news/view/175705
"Talos series, a line of Serial Attached SCSI (SAS) SSDs"

What about an array of SAS SSDs vs SATA SSDs?
I would be surprised to see an enterprise setup that doesn't use some form of redundancy, especially for a database setup.

The bus/controller/casing color does not determine the storage medium. We should make that distinction.
 
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