Removing physical disk from RAID & LVM

Removing physical disk from RAID & LVM

[Tero Mäntyvaara]

Hi,

I have filesystem build up with 5 x 320 GB disks with identical
partitions. Disks have 2 partitions and the first one is dedicated for
RAID-1 (/dev/md0) and second one is dedicated for RAID-5 (/dev/md1). The
disk /dev/md0 is mounted as /boot and the /dev/md1 is prepared for LVM.
PE size is 32 MiB and there is 38035 PEs.

I am going to remove one 320 GB disk and have already reduced the sizes
of existing LV:s. 1) What is the sufficient free PE number before I can
imagine shrinking of RAID-5 device? 2) How should I procede after having
enough free PE:s?


Tero

Re: Removing physical disk from RAID & LVM

[David Brown]

On 15/05/2012 07:24, Tero Mäntyvaara wrote:
> Hi,
>
> I have filesystem build up with 5 x 320 GB disks with identical
> partitions. Disks have 2 partitions and the first one is dedicated for
> RAID-1 (/dev/md0) and second one is dedicated for RAID-5 (/dev/md1). The
> disk /dev/md0 is mounted as /boot and the /dev/md1 is prepared for LVM.
> PE size is 32 MiB and there is 38035 PEs.
>
> I am going to remove one 320 GB disk and have already reduced the sizes
> of existing LV:s. 1) What is the sufficient free PE number before I can
> imagine shrinking of RAID-5 device? 2) How should I procede after having
> enough free PE:s?
>

Are you removing the disk permanently, or do you plan to replace it?


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Re: Removing physical disk from RAID & LVM

[Tero Mäntyvaara]

I was going to remove the one permanently.


Tero

On 15.5.2012 8:24, Tero Mäntyvaara wrote:
> Hi,
> 
> I have filesystem build up with 5 x 320 GB disks with identical 
> partitions. Disks have 2 partitions and the first one is dedicated
> for RAID-1 (/dev/md0) and second one is dedicated for RAID-5
> (/dev/md1). The disk /dev/md0 is mounted as /boot and the /dev/md1
> is prepared for LVM. PE size is 32 MiB and there is 38035 PEs.
> 
> I am going to remove one 320 GB disk and have already reduced the
> sizes of existing LV:s. 1) What is the sufficient free PE number
> before I can imagine shrinking of RAID-5 device? 2) How should I
> procede after having enough free PE:s?
> 
> 
> Tero
> 
> -- To unsubscribe from this list: send the line "unsubscribe
> linux-raid" in the body of a message to majordomo@vger.kernel.org 
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
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