Dell PERC H310 RAID slow to build

I have a Dell PowerEdge R320 with a PERC H310 controller
I did a CNTL-R at boot created a RAID1 with two SSD drives and installed Server 2012 R2 Standard
This RAID1 is two 256GB SSD drives, just a couple minutes and the RAID was done and ready

Now I added 6 SAS drives 1.8TB
Did a CNTRL-R and I'm building a RAID5
This is taking a very long time, I started at 1:00 pm and 2 hours later it's at 16%
does this sound normal?
thanks
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jsarinanaI.T. ManagerAsked:
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DavidPresidentCommented:
That is normal.   You're doing good.

But you would get much BETTER performance out of your SSDs if you could do o/s based RAID1.  The controller is slowing them down.

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pgm554Commented:
The h310 is basically software raid on a chip.
You should have gone with a real hardware caching raid controller(h710).
The difference in speed is very noticeable.
DavidPresidentCommented:
The H310 is NOT a ROC.    It is a real RAID controller card.   Dell H310It uses the 2008 SAS controller chip.  Here is the board.  See for yourself
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pgm554Commented:
For $75 bucks ,no battery backup and no cache?
It's a glorified software controller and a dog.
I wouldn't touch a file server raid controller without cache.
If I were going to attach a SAS tape drive ,it would be OK,but for file server raid,nope.

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DavidPresidentCommented:
It has cache on the 2008 chip, and the battery is not a factor unless system loses power without flushing I/O and has mechanical drives.  (Most SSDs will flush anyway).  As for CPU power ... that is the same chip / RAID controller used by the AMD mega raid family.

But what do I know .. i just have a developers NDA and access to some source code.

How you consider this "basically software RAID on a chip" escapes me.

Ah, wait, i see there are 2 flavors of this board ....
The H310 also comes in a daughter config, which is missing some capability, but still has the 533 Mhz CPU and some cache.

Another version of H310
pgm554Commented:
My take on it is that it's a HBA with the ability to do RAID.

As for cache ,the processor has some on board( L2 1024kb) ,but were talking from an instruction set stand point and from a data caching stand point would have little effect on overall speed and effectiveness(write through ,write back).

Quick Notes on the LSI SAS 2008

    The RAID controller supports both SAS 2 and SATA III at 6.0gbps
    Approximately 9w of power consumption for common cards
    Single PowerPC core at 533MHz
    No onboard cache
    PCIe 2.0 x8 interface
    Supports SAS expanders (with dual linking)
    Uses sas2flash utility to flash to IT/IR mode (when possible).

In a DB or virtualized environment the I/O performance would almost unusable.

Vmware has stated in many of their tech articles that using a non caching raid controller will result in woefully inadequate  performance for things as simple as file copying.
jsarinanaI.T. ManagerAuthor Commented:
thanks
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