Ubuntu
mdadm package

Server edition cannot boot when raid-1 is incomplete

Bug #544625 reported by tricky1
12
This bug affects 2 people
Affects Status Importance Assigned to Milestone
mdadm (Ubuntu)
Confirmed
Undecided
Unassigned
Nominated for Lucid by ceg

Bug Description

Beware of Ubuntu server edition

Serious (professinal use) of servers requires raid-1 so that sudden death of a hard drive does not result in loss of valuable data.

I installed Lucid Beta1 with system on an non raid partition and data on raid-1 mounted at /DAT2. Installation worked as expected.
However, when I removed the 2nd drive in order to simulate a defect, I was no longer able to boot the system because it hung with the splash screen showing "Waiting for /DAT2"

When I reconnected the 2nd drive it booted again, but it took several hours !! to resync the raid-1 and during that time the system was not available.

Lucid looks does not look bright and that's why I will stay with old but proven Lenny...

Revision history for this message
tricky1 (tricky1) wrote :

Found out that during boot mdadm generates segfault, but cat /proc/mdstat shows raid-1 is ready and ok.

Yet transfer rates of samba are still so slow that I wonder who is satisfyed by such a solution?

Have a look at the very old bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/471512

Maybe some day Mr. Kirkland will wake up and find his job gone ...

Revision history for this message
ceg (ceg) wrote :

Yes, software RAID in is a non-acceptable state in ubuntu. For servers just as well as for workstations.

Beware, if you want to securely save your data and that is probably mainly why anybody would use redundant disks anyway.

But ubuntu actually started to implement true udev/mdadm hotplugging, parting from the very stable legacy setup in debian, and left it in this state, since doing so.

A develeper can go through the documentaion on https://wiki.ubuntu.com/ReliableRaid and implement the most pressing 4 easy fixes provided to make up a working system. https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/136252/comments/44

tricky1 (tricky1)
Changed in ubuntu:
status: New → Confirmed
Revision history for this message
tricky1 (tricky1) wrote :

With ceg confirming the situation I changed the status and tried to set the categories, but omg:

Was not able to link it to mdadm or server edition...

Ubus have an undisturbed rest ...

ceg (ceg)
affects: ubuntu → mdadm (Ubuntu)
Revision history for this message
ceg (ceg) wrote :

Dupe of #259145 degraded NON-root raids never --run on boot

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