SAS vs SATA

Hello,
Could you please help me find out the difference between SAS vs SATA HDDs. I mean some comparison chart like difference between data speed etc.
Any help is much appreciate
Best Regards
prosek
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answering this question isn't easy as there are a lot of variables that go into both SAS and SATA drives.   if you're looking for a specific recommendation, it would help to know how you intend to use these drives.
SAS drives come in two sizes (2.5" and 3.5") and three speeds (7200 RPM, 10,000 RPM, and 15,000 RPM).   some drives are built for low-power draw and others are built purely for performance.   some are built simply to hold raw data where others are built for 24/7 operation in a server environment.
SATA drives come in a range of sizes and speeds with the fastest being 10,000 RPM.   very few SATA drives are rated to be run in a RAID configuration and even less are rated to be used in a 24/7 environment.
both SAS and SATA are offered in 3 Gb/sec and 6 Gb/sec versions, although most single drives are lucky to exceed 150 MB/sec.   high-end SSDs, on the other hand, are close to saturating 3 Gb/sec in synthetic benchmarks.
i suggest visiting both hitachigst.com and seagate.com and browsing through the drives they offer.   sites like storagereview.com can help with individual drive reviews.
ThinkStation C20
ThinkPad X1C · X220 · X60T · s30 · 600

Similar Messages

Possible to mix SAS and SATA in S10?

The S10 I purchased has the 146GB SAS drive attached to the LSI controller. I see in the hardware reference manual that there are spare SATA ports on the main board. Can I mix SAS and SATA drives on this machine if I am *not* using them in a RAID array? Does the fact that the SAS and SATA are likely to have different rotational speeds mean that I need to be worried about vibration/stability issues?
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SAS and SATA can definitely coexist. rotational speeds won't matter as the drives are harmonically dampened in their trays. in fact, i have three 15,000 RPM SAS drives sandwiching two 7200 RPM SAS drives in my D10 and can't feel any vibration in any of them. i've also hot-plugged SATA hard drives onto the intel controller with no issues.
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Both SAS and SATA RAID on same controller

Can I install both SAS and SATA raid on an RD240 with 8708EM2 controller?
I want to install first volume mirrored 600 GB SAS and second volume mirrored 2 TB SATA drives.

welcome to the forum!
both SAS and SATA arrays are supported simultaneously on the PHYs but it's not recommended to mix the two within an array (ie: creating a SAS+SATA disk RAID 1). per your question you can have a SAS+SAS RAID 1 plus a SATA+SATA RAID 1 concurrently on the LSI 1078 chipset.
ThinkStation C20
ThinkPad X1C · X220 · X60T · 600

Sun Ultra 40 M2 SAS and SATA compatibility

Is the Sun Ultra 40 M2 SAS backplane compatible with SATA HDD's? Can I mix SAS and SATA hard disks connected to the same backplane, or can I only use SAS HDD's with the SAS backplane?
Thanks

Hello All,
I just wanted to follow up with an update on my progress.
I put the 2TB drive back in and I did a green field build from media and everything went fine.
I went into the bios and flushed the device configurations. Some of the documentation that I was able to find suggest that you need to perform a low level format but I did not have to do that.
The data channel speed will not go past 1.5GB but the drive that I have is a 6 GB SATA drive. I only hoped to get 3 GB like the SAS drive.
The system with the SATA drive seems to be slower to boot and sluggish. I will try to take some timings and post as I think I want to try to run this machine with mixed disk. If the SAS drives are going to give me faster boots, I will populate slots 1 and 2 with SAS and the rest with SATA for data.
Eunix

Sas and sata on ultra 40 m2

I have an Ultra 40 M2 workstation with 2 SAS drives 15K, configured as an integrated stripping.
Can I add other 2 regular SATA drives?
should I buy some adapters?
last question, if i put 4 drives in stripping I/O will gain or degrade performance?
I need a super fast I/O.

You do not mention what OS you are using
My experiences with NVRAID are with a Tyan S2915 (nForce Pro 3600 + 3050) where I have a mirror, running Windows XP Pro, and an Asus M2N32SLI Vista Premium Edition (nForce 590SLI) with 4 disk striping and Windows XP x64. The striping with 4 disk on the Asus board is fanatastic (200 MB/s sequential writes), but I am not sure if it is also due to the 8 GB system memory and thus a big file system cache. Take note, NVRAID is limited to 2 TB, so for the Asus board I did the trick of creating two Strips (1.36 TB), then striping the two NVRAID stripes in Windows to get 2.72 TB.
But in general you can do stripping in the OS, you do not really need any special support in the controller.

Mac Pro 4,1 SATA for OS and RAID SAS for data?

Hello, Can I setup a new Mac Pro with two SATA drives for the OS and install a RAID Card and two SAS drives for data?
Or do they all have to be SAS or SATA drives in the machine? Meaning I cannot mix SATA and SAS.
Thanks,
Dean

Even MacWorld magazine liked the OWC drives.
If you are serious about using an SSD drive, they are generally too small for, and do not give enough speed improvement to, extensive documents, movies, pictures, Tunes, and so on. You should consider moving the /Users directory to a traditional Hard Drive.
Blocks on SDD drives can sustain a finite number of writes, thought to be in the neighborhood of 10,000. Some Cloning software is thought to do an abusive number of writes during cloning, so it may be better to install the System from scratch onto your new SSD.
I am an advocate of occasionally consolidating free space on an SSD drive and Zeroing it. Since these drives tend to be organized internally as really big blocks, eliminating small "free" blocks (with leftover data in them) may allow some drives to do fewer slow Read-Modify-Write cycles. This practice is, at best, controversial.

SAS/SATA Disks in S20

I got my new toy S20(4105RF5) few days ago. It was coming with Marvell SAS controller card + 1x146GB SAS hard disk. Now, I want to add in two 1T SATA disks in RAID 1 mode. I am not sure it is possible or not.
In the ThinkStation Hardware Installation and Replacement Guide(53y4246c.pdf), page 30. It descripted as "Your computer supports both SAS hard disk drives and SATA hard disk drives. However, be sure that you do not install both the SAS and SATA hard disk drives into the same computer."
Based on the ThinkStation User Guide (53y4306.pdf) , this model has two RAID controllers, Intel's and Marvell's.
My question is,
1. Can I install 2 SATA disks with SAS disk to the same Marvell RAID controller?
2. If not, can I install 2 SATA disks to Intel controller and leave the SAS disk on Marvell controller?
3. Or, it is no way use SAS disk and SATA disk together?
BTW, I can't get the Warranty Status in Lenovo ThinkVantage Toolbox. When I check it online, it always shows "Information for Warranty was not found."
Thanks
Jun
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This was a bit of a change midstream on S20. Initially, we did not support mixing of SATA and SAS drives. However after many requests, we did some more testing and determined that we could support it.
So yes, it's supported. However our recommendation is to not run drives off both controllers. If you're going to use the Marvell card/controller, it's best to connect all drives to that controller. As solar mentioned, you'll probably be able to get it to work connecting drives to two different controllers (obviously any RAIDed drives need to be on the same controller), but that's not officially supported so do so at your own risk.

Is it possible to upgrade the Mac Pro with SCSI/SAS drives?

Hi guys I am considering to move on to a Mac Pro from my old PC.
The Mac Pro enclosure is quite unique in its hard drive holders as no cables are used and all drives are connected with a plugin mechanism.
So I am curious if that will allow me to upgrade to a SCSI/SAS storage system which requires cable connections between drives and the SCSI/SAS card on the PCI-E slot. I dont know if this will be possible with the Mac Pro enclosure.
Has anyone tried to do this？
Btw is there any Ultra320 or SAS(preferably) interface card available for Mac OS X?

The connectors for SATA drives can be used with SAS drives. However, the controller needs to be SAS compatible. I have never installed a SAS drive in the Mac Pro bay to see what happens. If some one has a SAS drive and wants to try this I would be interested in the results.
My guess is that the Mac Pro would not see the drive.
Areca sells the Mac Pro PCIe bootable ARC-1680 SAS controller in several configurations. This controller allows the user to utilize SAS or SATA hard drives connected to the card. The ARC-1680x comes with two external mini SAS connectors that can support eight direct connect hard drives or up to 128 devices (in theory) when used with SAS expanders.
The ARC-1680LP has one internal mini SAS port and one external mini SAS port. I looked at the Mac Pro internal SATA connectors and they can unscrew from the frame but there is only about 1/2" of clearance in that area of the case. In addition, I would want the hot swap bays to still operate and I did not see an easy way to patch into the existing SATA connectors. It would be nice if the Mac Pro factory connectors used snap on SATA connector on the back of the backplane so that users could interface the 4 SATA bays with an internal PCie controller. However, its hard wired in the existing configuration. With the new Mac Pro PCIe RAID 5 card on the market there must be alternative connectors that allow this type of installation to work properly.
Based on the ease at which the Areca SAS controller can be added as an external using the ARC-1680x I went with that option. I am using it with eight direct connect SATA hard drives now. I plan to expand the storage by adding a SAS expander in the form of a hub or an enclosure with SAS capabilities. I have been looking at a 16 bay SAS enclosure but I am not sure how loud it will be
Details on the ARC-1680 can be found here:
http://www.areca.com.tw/products/pcietosas1680series.htm
Its very cool to have SAS or SATA capability along with a bootable card that can support tons of hard drives and RAID levels 0, 1,1E, 3, 5, 6, 10, 30, 50, 60 or JBOD . I booted the Mac Pro with a 2TB Mac OS X 10.4.10 RAID 6 volume and ran Xbench. It shows a 400MB/sec. hard drive setup and raises the overall Xbench score substantially.
While I doubt I will boot the Mac Pro from the RAID 6 volume much, it is very cool that that function is available. This is the only PCIe host adapter I have found with boot capabilities besides Apples new $999 4 port SATA internal card. SAS has lots of expansion capabilities. Users that want pretty much unlimited hard drive connectivity will enjoy the new ARC-1680x.
Have fun!

LSI 9650SE-12ML RAID Card - Can this be hooked up to a SAS expander?

I recently acquired a SuperMicro chassis that has a SAS2 expander backplane. It has SFF-8087 ports on it.http://www.supermicro.com/manuals/other/BPN-SAS2-846EL.pdfI made a post on another forum and someone mentioned that the card couldn't be used with that backplane since it's a SATA controller, however, the backplane is both SAS and SATA device compliant, it's only the RAID controller, as far as I know, that is a "SATA II" controller, and not a SAS controller.So, I couldn't find anything in the official documentation of this controller on whether or not it was able to control SAS devices. The card itself has a 3 SFF-8087 ports though, couldn't this theoretically still be used with a SFF-8087 to SFF-8087 cable(seen below)since the backplane is a SAS/SATA backplane?...
This topic first appeared in the Spiceworks Community

Ok what am I missing here in trying to add another disk to the backup pool? One of the two disk they had died so it cannot be attached at this time and unfortunately I am remote and do not have access to the server, the new disk or the remaining pool disk. Right now the new disk is attached and I am trying to add it to the pool.
C:\Users\Administrator>wbadmin GET DISKS
wbadmin 1.0 - Backup command-line tool
(C) Copyright 2012 Microsoft Corporation. All rights reserved.Disk name: DELL PERC H710 SCSI Disk Device
Disk number: 0
Disk identifier: {0ecbe8c9-0000-0000-0000-000000000000}
Total space: 1843.19 GB
Used space : 352.77 GB
Volumes: [RECOVERY],C:[OS],E:[VHD Drive]Disk name: DELL PERC H710 SCSI Disk Device
Disk number: 1
Disk identifier: {b342079d-0000-0000-0000-000000000000}
Total space: 18.80 GB
Used space : 100.33 MB
Volumes: D:[DATAPART2]Disk...

Does my macpro work with SAS drive?

I got seagate SAS drives, and tried to plugged to the mp, apparently my os doesnt see them.
here is the spec
Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 1 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP11.005D.B00
SMC Version: 1.7f10
Does my macpro take SAS drives at all? or it can only support sata?

You need a controller, such as $799 Apple Pro RAID or 3rd party.
Comparing SAS to SATA, but doesn't take into account the VelociRaptor
http://www.barefeats.com/harper13.html
WD VelociRaptor.
http://techreport.com/discussions.x/15174
http://www.barefeats.com/hard103.html
http://www.barefeats.com/hard106.html
http://eshop.macsales.com/item/Western%20Digital/WD3000GLFS/
http://www.maxupgrades.com/istore/index.cfm?fuseaction=Product.display&product_i d=180
There are recent thread on using SAS.

Xserve (early 2008) with SAS drives

Greeting All,
Can Xserve (early 2008) add SAS driver in any bay of the chassis? Or it will like MacPro need add RAID card in it.
Thanks,
Spin

Yes, SAS and SATA Apple Drive Modules (ADMs) can be mixed in Xserve.
If you want hardware RAID, you need the add-on card.
Quoth the current Xserve technical page "Three independent hot-plug drive bays with support for SATA or SAS drives; support for up to 3TB of hot-plug internal storage using the following Apple Drive Modules:
80GB 7200-rpm SATA with 8MB disk cache
1TB 7200-rpm SATA with 32MB disk cache
73GB 15,000-rpm SAS with 16MB disk cache
300GB 15,000-rpm SAS with 16MB disk cache"
And here's the obligatory official [ADM compatibility article link|http://support.apple.com/kb/HT1219].
Other potential expansion options include outboard direct attached storage (DAS) via SCSI or SAS and a PCI-X or PCIe controller, outboard storage via Network Attached Storage (NAS), or outboard storage via Fibre Channel (FC) Storage Area Network (SAN) storage via PCIe controller. If you're looking at SAS disks here specifically for performance, I'd tend to go to DAS SAS or FC SAN storage as potential alternatives; they're toward the higher end.

ThinkStation D10 7 Sata device

It is possible to connect 5 sata hdd and 2 optical device (sata) in a ThinkStation D10 6493-33G.
The motherboard has 5 sata connectors and 5 sas connectors.
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update: i just installed a single SATA HDD on the SAS array successfully so it looks like you can install any SATA device on any of the 10 available connectors. the SATA drive had to be flagged as 'online' using diskmgmt.msc to get it to show up in windows. however, i still recommend using the hard drives on the SATA controller and optical drives on the SAS controller.
on a side note, i benchmarked the drive using both the SAS and SATA controllers and speeds were identical.
ThinkStation C20
ThinkPad X1C · X220 · X60T · s30 · 600

X79-gd45 (8d) - Windows 7 Pro x64 installation questions

Hi,
I have a MSI X79-GD45(8D) board with i7-3930k processor that I am trying to install Win 7 x64 Pro on. I have a Sandisk Xtreme 240 SSD that I will be using as a system disk and 2X WD 1TB Black SATA 6GB/s (faex) drives that I will be using in a RAID 1 configuration for storing quickbooks and other data. This machine will run a quickbooks enterprise server serving 10 people
I want to get the installation right from the get go so that I can start testing it asap. Here are the steps that I will be taking to get this going. Could you folks comment on it so that I can modify it as needed. Thanks.
I have already installed the main board, 32GB RAM, Processor, fans etc and have setup the case. It does post without issues so far. Now for the installation, I have not partitioned the SSD (intend to make use of the full 240 GB) and leave the WD disks in a Raid 1 taking up the whole disk space (no partitions).
I am installing Win 7 x64 Pro on the SSD. Here I have several questions:
1. Do I set the SATA mode to RAID or should I just leave it at AHCI? I am assuming that this board recognizes drives in AHCI mode and installs Win 7. I ask this question because I will be using two WD SATA drives in Raid 1 for storing data later. Will the SATA mode be AHCI irrespective of that fact or should I change it to RAID after installing Win 7?
2. Should I install Intel RSTe iaAHCI or iaStorA (ver RSTe_Win7_8_64bit_3.5.0.1101_F6) with the F6 option for the setup I mentioned. I know the F6 installation in Win XP, but a little confused with Win 7. I ask this because, I have read some discussions of Intel drivers vs Microsoft's version for AHCI. Raid is confusing though. Please explain in detail if you can. Appreciated.
3 If I do F6 installation, do I install the AHCI/RAID drivers again after Win 7 is installed or does Windows properly load the F6 installation?
SSD, AHCI are all new to me with this build. I have tried to educate myself, but have some of the confusions that I listed above. Please explain how I can properly install it to the spec that I outlined above.
Your time, patience and help are all appreciated. Thanks
t
core - i7 3930k
MSI X79-GD45 (8D) MB
CoolerMaster 212 Evo Directpipe cooler (push pull 2 fans)
Corsair 500R Case with fans in the front, back, side, top (lots of air movement) - Holding steady at 42 C idle (efi readings)
32GB Patriot Cas 10 1600MHz XMP certified memory (XMP enabled in efi)
Gigabyte 6670 HD video card with 1gb ddr3(this machine will be used as a QB server)
Will install Win 7 x64 pro

Quote from: tommycat95 on 16-December-12, 12:17:35
Hi,
I have a MSI X79-GD45(8D) board with i7-3930k processor that I am trying to install Win 7 x64 Pro on. I have a Sandisk Xtreme 240 SSD that I will be using as a system disk and 2X WD 1TB Black SATA 6GB/s (faex) drives that I will be using in a RAID 1 configuration for storing quickbooks and other data. This machine will run a quickbooks enterprise server serving 10 people
I want to get the installation right from the get go so that I can start testing it asap. Here are the steps that I will be taking to get this going. Could you folks comment on it so that I can modify it as needed. Thanks.
I have already installed the main board, 32GB RAM, Processor, fans etc and have setup the case. It does post without issues so far. Now for the installation, I have not partitioned the SSD (intend to make use of the full 240 GB) and leave the WD disks in a Raid 1 taking up the whole disk space (no partitions).
I am installing Win 7 x64 Pro on the SSD. Here I have several questions:
1. Do I set the SATA mode to RAID or should I just leave it at AHCI? I am assuming that this board recognizes drives in AHCI mode and installs Win 7. I ask this question because I will be using two WD SATA drives in Raid 1 for storing data later. Will the SATA mode be AHCI irrespective of that fact or should I change it to RAID after installing Win 7?
2. Should I install Intel RSTe iaAHCI or iaStorA (ver RSTe_Win7_8_64bit_3.5.0.1101_F6) with the F6 option for the setup I mentioned. I know the F6 installation in Win XP, but a little confused with Win 7. I ask this because, I have read some discussions of Intel drivers vs Microsoft's version for AHCI. Raid is confusing though. Please explain in detail if you can. Appreciated.
3 If I do F6 installation, do I install the AHCI/RAID drivers again after Win 7 is installed or does Windows properly load the F6 installation?
SSD, AHCI are all new to me with this build. I have tried to educate myself, but have some of the confusions that I listed above. Please explain how I can properly install it to the spec that I outlined above.
Your time, patience and help are all appreciated. Thanks
t
core - i7 3930k
MSI X79-GD45 (8D) MB
CoolerMaster 212 Evo Directpipe cooler (push pull 2 fans)
Corsair 500R Case with fans in the front, back, side, top (lots of air movement) - Holding steady at 42 C idle (efi readings)
32GB Patriot Cas 10 1600MHz XMP certified memory (XMP enabled in efi)
Gigabyte 6670 HD video card with 1gb ddr3(this machine will be used as a QB server)
Will install Win 7 x64 pro
1.) IF you are going to be using the mainboads raid controller for the data drive. You need to set the mode to raid for the os install as well. Unless you are going to use the extra chipset for the SSD. (Ports 7 &8) You won't be able to enable raid later w/o re-installing the os.
2.) I put the os(Install) on a usb flash drive, I also include all of the drivers on this flash drive and load the newest versions even if it detects the drive right out of the gate.
3.)Once inside the OS, you would install the irst drivers there as well. (They are combined the raid bios / drivers and os drivers)
If this isn't going to be a very high I/o server, I probably wouln't bother with the SSD but since you have it you would just use it as a non-member drive of the raid. Have a fast drive for the os, isn't going to help the server all that much as most of the I/O will be on the data drive.
If this is going to be a heavily used server(high i/o) you may want to look at a raid 5 configuration for the os and data drives. As SSD's degrade over time and aren't really optimal for contant use like in a server. Raid 5 requires 3 drives minimum and is striping and mirroring so you get the best of both worlds.
http://en.wikipedia.org/wiki/Standard_RAID_levels
However, the board based raid controller isn't really the best for this set up. I am fairly loyal to Adaptec Raid controllers although you need to contact Adaptec (or whoever) in regards to compatiblity as MSI doesn't test server compoents on thier desktop products.
This is the one I last used:
http://www.neweggbusiness.com/Product/Product.aspx?Item=N82E16816103220
Quote
PMC-Sierra PM8013 Dual Core RAID on Chip (ROC)
Enclosure management support via LED header and SES2/ SGPIO
Intelligent Power Management – Reduces power and cooling costs by as much as 70%
512MB of DDR2 667MHz
Although it is probably overkill in your situation.
Also, look into the SAS drives as opposed to the sata drives. (if you use a raid card)
http://www.techrepublic.com/blog/networking/how-sas-near-line-nl-sas-and-sata-disks-compare/5323
Also see: http://www.microsoftstore.com/store/msstore/pd/Windows-Server-2012-Essentials/productID.258685800/search.true

Hard drives for Logic Pro 8, Final Cut, After Effects, etc.

Hello gang, although i have read through many threads re: hard drive configs for different people's uses on many different forums (thats why i am here to get it straight from the apple's mouth) that i frequent and contribute to I have read everything from '10k drives only give a slight speed to boot up times' to 'with these 10k drives my machine is FLYING/___sbsstatic___/migration-images/migration-img-not-avail.png'. The ladder posted by a crazy i am sure . So, If i were to purchase 2 10k drives (raptors are my only choice?) and use one for osx and my programs and the other for my scratch disk would i then use the stock 250 seagate that came with the machine as my itunes, pictures drive (i have an external FW800 750 seagate for back ups)? If i were to do this sort of configuration what would be my benefits if any at all? I had posted this in another forum and it pretty much had me more confused as people were going back and forth as to their PERSONAL preferences and it ran the gamut . I was hoping someone that uses the programs in the subject line or know what the new drives would do to make workflow more efficient. THIS IS THE LONGEST POST EVER. Anyway, any help would be greatly appreciated. This is my 1st Mac Pro so i would like to set this lovely lady up correctly. Again, thank you for making it this far if you have .
Best,
Pandasarus

Yes, the latest 300GB VelociRaptor is still king, and one G5 owner (not Mac Pro) installed three and was very pleased.
http://www.barefeats.com/hard103.html
There are other options.
A WD Caviar 640GB would do fine.
http://www.barefeats.com/harper14.html
RAID configurations of SAS vs SATA:
http://www.barefeats.com/harper13.html
TB drives: http://www.barefeats.com/hard94.html
Boot drive (doesn't have every model):
http://www.barefeats.com/harper9.html
I would go with 3 drives.
Backups: always have two or more so one is safe and off-line, things happen. TimeMachine plus SuperDuper backup clones combination.
Boot drive with just OS and applications, media drive, editing, and so you want to have a stripped scratch RAID.

On RAID 10 - How to relieve Log Writer Slow Write Time Trace Files

We have a DELL 8 CPU 5460 3.16Ghz Xeon with Dell Open Manage RAID 10 array
Oracle 10g 10.2.0.4 on RedHat EL 5 with
filesystemio_options='' (DEFAULT)
disk_asynch_io='TRUE' ( NOT DEFAULT)
Running 2 instances 64 bit 10g 10.2.0.4 with an app that does a lot of row updates and uses BLOBs heavily.
Our storage (RAID 10) is presented through a single mount point.
I periodically see these messages in a lgwr trc file as follows
Warning: log write time 560ms, size 5549KB
*** 2010-02-25 17:22:24.574
Warning: log write time 650ms, size 6759KB
*** 2010-02-25 17:22:25.103
Warning: log write time 510ms, size 73KB
*** 2010-02-25 20:33:00.015
Warning: log write time 540ms, size 318KB
*** 2010-02-25 20:35:17.956
Warning: log write time 800ms, size 5KB
Note that most of these are larger chunks of data.
Our log wait histogram is as follows:
106 log file parallel write 1 465780158
106 log file parallel write 2 5111874
106 log file parallel write 4 5957262
106 log file parallel write 8 2171240
106 log file parallel write 16 1576186
106 log file parallel write 32 1129199
106 log file parallel write 64 852217
106 log file parallel write 128 2092462
106 log file parallel write 256 508494
106 log file parallel write 512 109449
106 log file parallel write 1024 55441
106 log file parallel write 2048 11403
106 log file parallel write 4096 1197
106 log file parallel write 8192 29
106 log file parallel write 16384 5
In discussions with the group that builds and maintains the systems (DBA's do not) we have asked for more spindles / hba's / mount points to address this issue. We have been advised that since the RAID 10 spreads the I/Os across multiple drives this is not going to affect the situation.
Our thoughts are that multiple HBAs going to separate RAID 10 devices would help relieve the pressure.
Thank you.

Is this an internal RAID array? Is it composed of SCSI (SAS) or SATA drives? How many drives are in the array?
Does the RAID controller have a built in battery backed cache (some of Dell's RAID controllers have 128MB, 256MB, or 512MB of battery backed cache). If the RAID controller has a battery backed cache, consider disabling the caching of all read operations, and set the write policy to write-back (see: http://support.dell.com/support/edocs/software/svradmin/5.1/en/omss_ug/html/cntrls.html ).
Charles Hooper
Co-author of "Expert Oracle Practices: Oracle Database Administration from the Oak Table"
http://hoopercharles.wordpress.com/
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.

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