troubleshooting Question

RAID 1 on ML110 G4

Avatar of dqnet
dqnet asked on
StorageServer Hardware
8 Comments1 Solution1272 ViewsLast Modified:
Hi folks,

I have a question I need answering for educational purposes.

HP ML110 G4 server (little tower that I have crammed with RAM for virtual tests).
Now basically it comes with an onboard HP Embedded RAID controller made by Adaptec.

Here is the deal...
I created a mirror between two 74 gig raptors (lets call them A and B). Both work fine and Window server 2008 installation seems them as one. All good.
First test... I run windows, simply unplug a drive (A) to simulate a failure and windows keeps running perfectly.
I reboot and windows runs of the other drive as it should (B). Obviously in degraded state.
I shut the server down and do the following:
I plug the old drive in to simulate the return of drive (A) and unlplug drive (B).
Windows CANNOT start... Now what I want to know is WHY? and is this by nature even with the most expensive SmartArray 400p or Dell Perc 5i (and the other big boys)?

I 'BELIEVE' its because once drive A is removed it removes its register from the Array so when B goes and A returns it has no place in the array anymore?
Something to do with B becoming the new and final drive?

Once I rebuild the array in the BIOS (driver issues as to why I cant do it in windows), I can fail any of the two again while windows continues working.
I just cant plug the failed one back in and fail (unplug) the opposite one in the hope windows will boot up... It starts then blue screens.

Is this by RAID design or by the fact that this controller is just a cheap embedded sata controller?

many thanks..
ASKER CERTIFIED SOLUTION
PCBONEZ

Our community of experts have been thoroughly vetted for their expertise and industry experience.

Join our community to see this answer!
Unlock 1 Answer and 8 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 8 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros