Re: [ceph-users] Re install ceph

[David Turner]

I've reinstalled a host many times over the years. We used dmcrypt so I
made sure to back up the keys for that. Other than that it is seamless as
long as your installation process only affects the root disk.  If it
affected any osd or journal disk, then you would need to mark those osds
out and re-add them to the cluster.

On Wed, Sep 27, 2017, 4:33 AM Ronny Aasen  wrote:

> On 27. sep. 2017 10:09, Pierre Palussiere wrote:
> > Hi,
> >
> > Is anyone know if it’s possible to re install ceph on a host and keep
> osd without wipe data on them ?
> >
> > Hope you can help me,
>
>
> it depends... if you have journal on same drive as osd, you should be
> able to eject the drive from a server, connect it to another and udev
> should mount and active osd (data will ofcourse move)
>
> i can not see why reinstall of a host would be much different from
> moving the disk.
>
> if you have journal on a separate device then you need to move osd and
> journal device together. you can also have configuration that makes this
> process less automatic.
>
> !BUT! i would not in any way risk reinstalling a host with live osd's.!
>
> I would set all osd's out and let the data remap to other osd's so you
> have a temporary replica on other osd's. while reinstalling. the
> backfill should be fast since the data is still on disk.
>
> or
>
> I would set crush weight to 0 and drain all osd's off the node before
> reinstalling. here the backfill will take longer, since you actualy have
> to refill disks.
>
>
>
> kind regards
> Ronny Aasen
>
>
>
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Re: [ceph-users] Re install ceph

[Ronny Aasen]

On 27. sep. 2017 10:09, Pierre Palussiere wrote:

Hi,

Is anyone know if it’s possible to re install ceph on a host and keep osd 
without wipe data on them ?

Hope you can help me,



it depends... if you have journal on same drive as osd, you should be 
able to eject the drive from a server, connect it to another and udev 
should mount and active osd (data will ofcourse move)


i can not see why reinstall of a host would be much different from 
moving the disk.


if you have journal on a separate device then you need to move osd and 
journal device together. you can also have configuration that makes this 
process less automatic.


!BUT! i would not in any way risk reinstalling a host with live osd's.!

I would set all osd's out and let the data remap to other osd's so you 
have a temporary replica on other osd's. while reinstalling. the 
backfill should be fast since the data is still on disk.


or

I would set crush weight to 0 and drain all osd's off the node before 
reinstalling. here the backfill will take longer, since you actualy have 
to refill disks.




kind regards
Ronny Aasen



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[ceph-users] Re install ceph

[Pierre Palussiere]

Hi,

Is anyone know if it’s possible to re install ceph on a host and keep osd 
without wipe data on them ?

Hope you can help me,

Thanks in advance.
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