Re: [MooseFS-Users] Mixing OS version

[William K. <bi...@ii...>]

That will take a long time but will work - mixing OS is not a problem.

Do one and see how it goes.  Then add the other 6 and at the same time
mark the remainder for removal.  The data will move around and
eventually the older systems will notify they are ready for removal.

One caveat - this will add to the background cluster load - avoid doing
all at once on a very busy cluster as things will noticeably slow down.

I usually just add the new system(s) all at once. Then shut down the
chunkserver process on the first system you want to remove.  If there
are any missing chunks showing up restart and remove from maintenance
etc. and try again. If there are no missing chunks, let the cluster
rebalance and catch up. (I currently have 6 chunkservers and can usually
remove at least two at once without losing any chunks.) Rinse and repeat
- I am usually too impatient to wait the many hours it takes for a large
disk marked for removal to empty ... and I have backups :)

BillK


On 18/11/21 3:31 am, WK wrote:
> We have a very old CentOS7 based MFS system
>
> 1 Master
>
> 1 Metalogger/backup Master
>
> 7 chunkservers.
>
> The MFS software is reasonably up to date they are all at least 3.0.115
>
> The hardware was OLD when we put the system in place, as we reused
> older servers we were replacing.
>
> So now that equipment is REALLY old and we are beginning the process
> of updating them.
>
> We would like to use Ubuntu20 for the OS on the newer hardware.
>
> Our initial plan would be to introduce a new U20 chunkserver, get it
> replicated up and then remove one of the older C7 chunkservers.
>
> then wash, rinse repeat for the others for a few weeks until everybody
> is caught up.
>
> Is there a problem mixing Cent7 and U20 systems on the same network in
> that fashion?
>
> Can we start with the chunkservers or should we immediately replace
> the Master with U20 and then start replacing the chunkservers?
>
> sincerely,
>
> -wk
>
>
>
>
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