[Chipset HM87] mdadm: platform does not support raid1 on 2 disks

[HGeiß]

The product specification for Intel's Chipset HM87

https://www-ssl.intel.com/content/www/us/en/chipsets/performance-chipsets/mobile-chipset-hm87.html?wapkw=hm87 https://www-ssl.intel.com/content/www/us/en/chipsets/performance-chipsets/mobile-chipset-hm87.html?wapkw=hm87

states, that it is fully capable of Intel RST, and thus RAID levels 0,1,5,10.

Ramu Ramakesavan and Patrick Thomson publish this white paper about Intel RST under Linux:

http://www.intel.se/content/dam/www/public/us/en/documents/white-papers/rst-linux-paper.pdf http://www.intel.se/content/dam/www/public/us/en/documents/white-papers/rst-linux-paper.pdf

It states, that for Intel RST, RAID1 is well possible with 2 drives. And it tells how to set that up with mdadm

I manage to create the container using

# mdadm –C /dev/md/imsm /dev/sd[a-b] –n 2 –e imsm

When i setup the specific mirror RAID set i receive the following error:

# mdadm –C /dev/md/mirror /dev/md/imsm –n 2 –l 1 –c 16 –z $((250*1024*1024))

mdadm: platform does not support raid1 on 2 disks

Why is that?

[Jose_H_Intel1]

A possible workaround will be creating the RAID array through the Intel® RAID Option ROM which is accessible by pressing Ctrl + I during POST.

The SATA controller mode should be set to RAID in BIOS and two or more drives should be connected to the Intel® HM87 Chipset.

[HGeiß]

Hi and thanks for your answer.

That's what i tried before i registered with Intel Communities.

I enabled the CSM in BIOS and went to the familiar [Ctrl]-[I] but the selection is between RAID0 (Stripe). Full stop.

Updated the driver using the stock Windows 8.1 that came on the SSD, but sadly that didn't change the BIOS part of Intel RST which remained 12.7.0.1936

What next? Ask ASUS if there's a BIOS Version 207 in the pipeline? Is the ASUS team responsible for not implementing that part of the chipset's features?

Thanks Joe for finding out,

Hubert

[Jose_H_Intel1]

Updating the Intel® Rapid Storage Technology software driver in Windows* will not change the Intel® RAID Option ROM version. Updates for the Intel® RAID Option ROM version are usually provided via BIOS updates by the system manufacturer.

You may try resetting the disks to non-RAID first or try creating the RAID 1 in Windows* with Intel® Rapid Storage Technology as indicated in pages 30-33 of the user guide. Otherwise, contact the system manufacturer to find out what are the supported features.

http://download.intel.com/support/chipsets/imsm/sb/irst_user_guide.pdf http://download.intel.com/support/chipsets/imsm/sb/irst_user_guide.pdf