RAID0 install on 2 x 120GB Samsung Evo840 SSDs

Bug #1508885 reported by peter
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
grub-installer (Ubuntu)
New
Undecided
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Bug Description

After searching before submitting this report I have learned that SSD support for RAID is not yet implemented in Ubuntu. Nevertheless, I thought that this information may still be assistive to a developer.
Process was a standard installation attempt, after 20+ attempts in different configurations of RAID0 & Fake-RAID0, all without success, boot-repair was then installed and different repair attempts were made, all without success.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.18.8.10
ProcVersionSignature: Ubuntu 3.19.0-25.26~14.04.1-generic 3.19.8-ckt2
Uname: Linux 3.19.0-25-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CasperVersion: 1.340.2
Date: Thu Oct 22 22:00:03 2015
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity initrd=/casper/initrd.lz quiet splash --
LiveMediaBuild: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
ProcEnviron:
 LANGUAGE=en_CA.UTF-8
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

Revision history for this message
peter (pburrin1969) wrote :
Revision history for this message
Phillip Susi (psusi) wrote :

"After searching before submitting this report I have learned that SSD support for RAID is not yet implemented in Ubuntu."

No... SDD, HDD, usb flash drive, or loopback file... mdadm doesn't care; it works on anything.

The problem appears to be that grub can't find the raid array and the partitions it contains. I suspect this is due to the fact that you are using an intel fakeraid, which is now handled by mdadm instead of dmraid, and grub hasn't been updated to handle this ( since it still is a fakeraid even though it is handled by mdadm ).

Revision history for this message
Phillip Susi (psusi) wrote :

Could you confirm this by running mdadm -D /dev/md0 and posting the output? Also as a workaround: don't use fakeraid; use conventional linux software raid.

Revision history for this message
peter (pburrin1969) wrote :

Thanks for the information Phillip.

My apologies for he extreme delay in responding, I don't spend much time on here. I just received an order of SSDs so I'll try your suggestion shortly and respond with further info.

Cheers.

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