[GTALUG] Raid 10 repair question
o1bigtenor
o1bigtenor at gmail.com
Thu Feb 19 12:17:57 UTC 2015
Sorry for a slow response but life intervened!
On Tue, Feb 17, 2015 at 5:07 PM, Digimer <lists at alteeve.ca> wrote:
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> On 17/02/15 06:04 PM, o1bigtenor wrote:
> > Now I used gdisk to set things up so likely that is where I will
> > need to start - - - hmmmmmmmmmmm.
> >
> > Has anyone done anything like this in the somewhat recent past?
> >
> > (Wondering if when disk is partitioned that mdadm will happily
> > absorb that disk into the array. Likely will need another reboot
> > too!)
> >
> > Dee
>
> I use parted or fdisk, I am not familiar with other tools. In the end,
> what matters is that the partition(s) on the new drive match (equal
> size or larger) the existing partitions.
>
The drive has not yet been partitioned. The disks (in the array) were
partitioned to be just one large partition (whole disk).
>
> You will then have to tell mdadm to use the new partitions. It will
> not "just use them".
>
> As Lennart asked; Show us the output of 'cat /proc/mdstat'.
# cat /proc/mdstat
Personalities : [raid10]
md0 : active raid10 sdc1[0] sda1[3] sde1[1]
1953518592 blocks super 1.2 512K chunks 2 near-copies [4/3] [UU_U]
unused devices: <none>
> Also,
> please share the output of:
>
> parted /dev/sda print free
>
# parted /dev/sda print free
Model: ATA ST31000524AS (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
32.3kB 1049kB 1016kB Free Space
1 1049kB 1000GB 1000GB primary raid
1000GB 1000GB 745kB Free Space
> parted /dev/sdb print free
>
sdb is my system drive and is not part of the array
> parted /dev/sdc print free
>
# parted /dev/sdc print free
Model: ATA ST31000524AS (scsi)
Disk /dev/sdc: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
32.3kB 1049kB 1016kB Free Space
1 1049kB 1000GB 1000GB primary raid
1000GB 1000GB 745kB Free Space
> parted /dev/sdd print free
>
sdd is my RAM drive
sde
# parted /dev/sde print free
Model: ATA ST31000524AS (scsi)
Disk /dev/sde: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
32.3kB 1049kB 1016kB Free Space
1 1049kB 1000GB 1000GB primary raid
1000GB 1000GB 745kB Free Space
sdf
# parted /dev/sdf print free
Error: /dev/sdf: unrecognised disk label
When the system was setup I had the array as disks sda, sdb, sdc and sdd
with sde being my system disk and sdf being the RAM drive.
In the process of installing the new hard drive I did not label the wires
from the existing setup when I was removing the wires. (I know better just
didn't think first!)
The new number schema doesn't seem to be causing any difficulties. Should I
be trying to change things back to the sda - d raid and e/f being for the
system drive and RAM drive?
Thanking you for your sharing and insights!!
Dee
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