On 12/5/18 11:55 AM, Benjamin Smith wrote:
The point of RAID1 is to allow for continued uptime in a failure scenario.
When I assemble servers with RAID1, I set up two HDDs to mirror each other,
and test by booting from each drive individually to verify that it works. For
the OS partitions, I use simple partitions and ext4 so it's as simple as
possible.
I used my test system to test RAID failures. It has a two-disk RAID1
mirror. I pulled one drive, waited for the kernel to acknowledge the
missing drive, and then rebooted. The system started up normally with
just one disk (which was originally sdb).
### content of rdosreport.txt
It's big; see
http://chico.benjamindsmith.com/rdsosreport.txt
[ 0.000000] localhost kernel: Command line:
BOOT_IMAGE=/boot/vmlinuz-0-rescue-4456807582104f8ab12eb6411a80b31a
root=UUID=1b0d6168-50f1-4ceb-b6ac-85e55206e2d4 ro crashkernel=auto
rd.md.uuid=ea5fede7:dc339c3b:81817fc4:aba0bd89
rd.md.uuid=7a90faed:4e5a2b50:9baa8249:21a6c3da rhgb quiet
/dev/sda1: UUID="6f900f10-d951-2ae7-712c-a5710d8d7316"
UUID_SUB="541c8849-58bd-8309-96fd-b45faf0d40bb" LABEL="localhost:home"
TYPE="linux_raid_member"
/dev/sda2: UUID="ea5fede7-dc33-9c3b-8181-7fc4aba0bd89"
UUID_SUB="f127cce4-82f6-fa86-6bc5-2c6b8e3f8e7a" LABEL="localhost:root"
TYPE="linux_raid_member"
/dev/sda3: UUID="39f40c01-b62c-8434-741d-38ee40c227f9"
UUID_SUB="18319e88-67c4-94da-e55f-204c37528ece" LABEL="localhost:var"
TYPE="linux_raid_member"
/dev/sda5: UUID="7a90faed-4e5a-2b50-9baa-824921a6c3da"
UUID_SUB="40034140-1c7f-96c9-d4bd-4f4e25577173" LABEL="localhost:swap"
TYPE="linux_raid_member"
The thing that stands out as odd, to me, is that your kernel command
line includes "root=UUID=1b0d6168-50f1-4ceb-b6ac-85e55206e2d4" but that
UUID doesn't appear anywhere in the blkid output. It should, as far as
I know.
Your root filesystem is in a RAID1 device that includes sda2 as a
member. Its UUID is listed as an rd.md.uuid option on the command line
so it should be assembled (incomplete) during boot. But I think your
kernel command line should include
"root=UUID=f127cce4-82f6-fa86-6bc5-2c6b8e3f8e7a" and not
"root=UUID=1b0d6168-50f1-4ceb-b6ac-85e55206e2d4"
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