Occasional Blue Screen Pointing to iaStorB; how to troubleshoot?

At random times while using a Dell T5810 Precision Workstation (Windows 10 Pro 64-bit) I get  a System Stop blue screen. The code is
DRIVER_IRQL_NOT_LESS_OR_EQUAL and the failed device is iastorb.sys.

A minidump file is attached.

The system reboots on its own. I've seen it maybe three times over the past couple weeks. There are no hardware or software changes I know of that were done just before this problem started occurring. (I just removed an internal SATA data drive and added a new external hard drive but this crash problem started before then.)

The hard drive configuration has two sk Hynix 1TB SSDs on a PCIe 3.0 x16 expansion card. Drives are NOT in any RAID configuration. There are no drives connected to the SATA ports on the motherboard. Intel Rapid Storage Technology Enterprise is installed on the computer.

The external drive (Western Digital Gold 4TB WD4002FYYZ) connects through a StarTech docking station to a rear USB3 port.

I ran the Intel Driver & Support Assistant and the Dell update checker. They say all drivers are current.

Device Manager shows no devices with problems. In System Information no problem devices are listed.

Do I need iaStorB and iaStorA?

Assuming I do need them, any suggestions how to troubleshoot this problem?

Thanks, Pete
Peter ByeRetiredAsked:
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
What is the make/model of the card the 1TB SSDs are connected to?
Peter ByeRetiredAuthor Commented:
Philip, it is part of the original Dell configuration. There isn't much information available. The card is Dell item 414-BBBJ. Apparently manufactured for them by Foxconn.


Some pictures on Amazon, of all places:


nobus - thanks; I will check out these resources and report back.

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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Ah, one of these.

We have these Asus cards that are similar in nature.

For them to be utilized correctly Bifurcation needs to be enabled in the BIOS. Please verify that such a setting exists and if it does that it is enabled. If it does not, then it could be the source of the BSOD as bifurcation is essentially how one x16 PCIe bus can be split up into four 4x physical connections.

Now, as far as the BSOD on the Intel software RAID driver, are the two set up in a RAID 1 array using the Intel RAID software setup?
Peter ByeRetiredAuthor Commented:
I did find two things of note:

I updated the Intel Rapid Storage Technology enterprise driver about 2 August with a newer driver recommended by the Dell website drivers section for this PC. Might this be causing the problem? Can it be backed out to an older version?

I just saw a newer driver for the SK Hynix SSDs, again on the Dell website. Interestingly, though, Dell's automated scanner to recommend updated drivers for my computer does NOT say I need this new driver. Should I try installing it anyway?

nobus: Most of the sections at the troubleshooting link ysay I should buy their (Solvusoft) software. Should I?

Philip: There is no BIOS option called Bifurcation, or any other that seems to enable this splitting. Perhaps it is built in since Dell provided the capability on their own branded card? Below are two pictures showing the BIOS options. Some notes on settings:

Multicores: all
SpeedStep: on
C-states: checked
Limit CPU ID value: not checked
Turboboost: checked
Hyperthread Control: checked
System Isochronous Mode: Disabled (reduces latency at expense of bandwidth, mostly for real time audio or video streaming) Cache pre-fetch: checked
Dell Reliable Memory Technology: checked

Advanced Controls:
ASPM: auto
PCIe link speed: auto

BIOS settings 1BIOS settings 2
Peter ByeRetiredAuthor Commented:
Philip: I forgot to add: no RAID configurations. Two independent drives, one for system/applications and one for data.
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
SATA Operation set to AHCI or RAID?
Peter ByeRetiredAuthor Commented:
in the BIOS SATA is set to RAID, not AHCI. The other day I started to change it to AHCI and got a terrible-looking warning message that this might make the system unbootable and require a reinstallation! I assume this is really not likely since no RAID is in use but nonetheless I did not make any changes. So, still set for RAID.

Would a setting like this cause such occasional BSODs, or would it be a continuous problem? Should I change it to AHCI, or does it not matter?
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
As it so happens, a fellow MVP itemized this the other day!

Step 1: With Windows running, go to MSCONFIG and enable “boot to safe mode with minimal” but DO NOT immediately reboot; just select EXIT without restart.

Step 2: From Windows button, select Shift > Restart, then go to Troubleshooting > Advanced > Change UEFI settings. This will reboot computer to BIOS

Step 3: From BIOS change drive setting from RAID-ON to AHCI. Then reboot

Step 4: Computer should successfully reboot into safe mode. Log in, Go to MSCONFIG and disable boot to safe mode. Then restart computer.

Step 5: Computer should reboot and all is done.
That will flip it over and get rid of the BSODs.
Peter ByeRetiredAuthor Commented:
I should follow this sequence rather than simply booting into setup by pressing F2 during boot and changing the SATA setting in setup?
>>   ysay I should buy their (Solvusoft) software    <<  NO - scroll down to the 10 Steps, that's what you need
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Yes, follow the steps to the letter.
Peter ByeRetiredAuthor Commented:
I have:

* Done seven of the ten steps in the troubleshooting guide. I did not do: Step 2, Use a registry cleaner to scrub Windows-specific settings. Step 4: Use System Restore. Step 10: Do a Windows 10 clean reinstallation. There were no errors in the other steps.

* Updated the device firmware on both SK Hynix SSDs (OS/applications and data) using the updater from the Dell support page for this computer.

* Reinstalled the current Intel Rapid Storage Technology enterprise driver.

* Changed SATA operation from "Raid On" to "AHCI" using the prescribed steps.

The system rebooted normally after each step.

We then lost Internet service for about 20 minutes although I don't think that should cause a problem. When that outage started I stepped away from the computer for about one hour. During that time two crashes occurred. Here are the two event log entries for the critical event of the crash; the noted DMP file is 1.6 GB so I cannot attach it.

7:00 PM - the first crash

The computer has rebooted from a bugcheck.  The bugcheck was: 0x000000d1 (0x0000000000000008, 0x0000000000000002, 0x0000000000000000, 0xfffff80e27267218). A dump was saved in: C:\WINDOWS\MEMORY.DMP. Report Id: 8996bb67-856e-468c-8ca7-03a14117f0fc.

7:50 PM - the second crash

The computer has rebooted from a bugcheck.  The bugcheck was: 0x000000d1 (0x0000000000000008, 0x0000000000000002, 0x0000000000000000, 0xfffff801d9cc7218). A dump was saved in: C:\WINDOWS\MEMORY.DMP. Report Id: 7817103d-11cd-4424-a8da-975b8be26134.

I doubt the crashes had anything to do with the Internet service loss. I assume they do have something to do with the changes I have made.

I am hoping the changes did not make things worse.

I am waiting to see if further crashes occur.

Any suggestions what to do now?
Peter ByeRetiredAuthor Commented:
I noticed the two crashes did produce mini-dump files. They are attached.
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Remove the Intel Rapid Storage/RAID software. It is not needed for AHCI.

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Peter ByeRetiredAuthor Commented:
Hi Philip, I just want to confirm you are referring to the Intel Rapid Storage Technology enterprise software?
for further troubleshooting, i suggest you maka a list of things you want to do / test, then do each one and crass it out on the list
i would start with an extensive ram diagnostic, i suggest you use memtest+ http://www.memtest.org/
scroll down for download section, or use the ubcd ( see attached fileà
you can test :
by disconnecting all hardware that is not needed, eg cd drive, other drives - or test with 1 ram stick
 if it happens in safe mode -
overheating   http://www.almico.com/speedfan.php
clean boot
install OS on another drive,
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
That's correct. Remove the Rapid Storage driver.
Peter ByeRetiredAuthor Commented:
OK, I uninstalled the Intel Rapid Storage Technology enterprise software. I do not see any RAID devices listed in Device Manager.

So I guess I need to watch how the system does for a while now.

A registry cleaner was one of the steps I did not do from the Solvusoft troubleshooting. I have used the JV16 PowerTools registry cleaner for years although only in its super-safe mode where it leaves Windows alone.

How do you feel about using a registry cleaner and letting it clean the Windows part of the registry?
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
We don't, and won't, use a registry cleaner. Ever.
i agree - very easy to corrupt your system...
Peter ByeRetiredAuthor Commented:
Thanks, Philip and nobus. Many of your suggestions were very helpful in troubleshooting this issue. The core solution was realizing I did not even need the Intel Rapid Storage Technology enterprise software and the specific steps to change drive operation from RAID to SATA in Setup.

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