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Old 06-08-2010, 12:56 PM   #1
Spokane-Dude
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Ubuntu server install wipes out RAID5 settings


I have a 2-quad core Intel Xeon system that I have set to RAID-5. I then attempted to install Ubuntu Server. When the message came up about enabling SATA RAID, I said NO because I have hardware RAID installed on the box.

So I completed the install, and when I go to view the RAID configuration using the Intel Matrix Storage Manager during boot, it says:
Volume0, Level: RAID5(Parity), Status: Degraded
When I install enabling SATA RAID, I get a message asking me to "configure iSCSI volumes". When I click on that, I get another message: Loginto iSCSI targets. When I click on that I get another message: "Enter an IP address to scan for iSCSI targets". I have no idea what to put as thye iSCSI target portal address!

Any ideas?

Last edited by Spokane-Dude; 06-08-2010 at 01:08 PM. Reason: Clarification
 
Old 06-08-2010, 01:13 PM   #2
strick1226
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Unfortunately, Intel Matrix Storage Manager does not equal true hardware-based RAID. It's actually considered a "FakeRAID" controller. Most hardware-based RAID controllers supported in linux are fairly pricey.

More info here: https://help.ubuntu.com/community/FakeRaidHowto .

For more information, search these forums (or google) using the terms "linux" and "fakeraid" .

Hope this helps.
 
Old 06-08-2010, 01:19 PM   #3
Spokane-Dude
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I looked at the spec sheet that came with the box... I have a Intel ESB2 SATA 3.0Gbps Controller, RAID 0,1,5,10 support with 3 Hot-Swap 250 GB SATA 3G drives.

Not to be condescending, but this sounds like hardware RAID to me...

Last edited by Spokane-Dude; 06-08-2010 at 01:33 PM. Reason: clarification
 
Old 06-08-2010, 01:37 PM   #4
strick1226
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Unfortunately, there doesn't appear to be much documentation on that particular controller, at least not specific to successful linux installations.

The Intel Matrix Storage Manager generally is used to configure Intel IOhub-based fakeraid controllers, which tend to work just fine in Windows platforms using the right driver... but I've had less than optimal results with linux server installs with ICH9- and ICH10- based motherboards and linux (unless I change the SATA channels to non-RAID and use mdadm+linux sw RAID).

That said, I'm under the impression that the RAID functions will probably work just fine for you in Windows, but not necessarily in linux.
 
Old 06-08-2010, 01:39 PM   #5
Spokane-Dude
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So it's not platform independent since it's hardware and not software? RATS!

Is there any way I can utilize the other 2 HD in a software RAID? (not sure I said that correctly!)

What about the iSCSI target portal address it's asking for?
 
Old 06-09-2010, 08:55 AM   #6
strick1226
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Although I'm not intimately familiar with your particular controller, it certainly appears to be very similar to many Intel IOHUB-based controllers that aren't true hardware RAID controllers. Perhaps someone more experienced with this particular model can give you a solid answer, but getting it to work in linux as well as it does in Windows appears unlikely.

If you're not interested in running any other operating systems on the box I would just use linux software raid (mdadm) . Before you do that it's probably necessary to enter the motherboard's BIOS and modify the SATA interfaces/channels to non-RAID (AHCI, perhaps).

You could use all three disks in a RAID 5 config, or two of the three in a RAID 1 mirror. The text-based Ubuntu alternate installer allows for custom partitioning, including the creation of software RAID setups--I believe the Ubuntu Server installer does as well.

If you really want functional hardware RAID in linux I'd recommend checking out products from either 3Ware or Areca. They're not inexpensive, however.

Good luck!
 
  


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