[DRBD-user] Re: DRBD resize errors

[Lars Ellenberg]

On Tue, Aug 21, 2007 at 11:37:10AM +0100, Irvine, Doug - Corporate Core - ICT Services wrote:
> Hi,
>  
> We have a number of secondary schools which use a RHEL3 pair of servers
> as their internet cache.
>  
>  
>  
> Unfortunately the initial disk allocation has proved to be too small in
> the / partition.
>  
> 
> Filesystem           1K-blocks      Used Available Use% Mounted on
> /dev/sda3             10394720   3245996   6620852  33% /
> /dev/sda1               198321     25640    162442  14% /boot
> none                   1282636         0   1282636   0% /dev/shm
> /dev/drbd0            62669424     55076  59430904   1% /data
> 
>  
> I recently used gparted to resize the disks.
>  
> This all seemed to work fine initially, but now we get errors in
> /var/log/messages saying the OS is trying to write off the end of the
> device.
>  
> I have :
>  
> On the standby server
>     #drbdadm disconnect all
>     #mke2fs /dev/sda2 - reports correct disk allocation

if you do a new mkfs, this has absolutely nothing to do with resizing.

>     #drbdadm connect all - do same on primary node
>     #drbdadm invalidate all

if /dev/sda2 is the "lower level disk" of drbd0,
DO NOT: mke2fs /dev/sda2.
DO: mke2fs -j /dev/drbd0.

http://thread.gmane.org/gmane.linux.network.drbd/12690/focus=12692
may help to understand what is going on.

> Secondary server then 'syncs'
>  
> Then failover the servers and re-run on the other standby server.
>  
> After a day of running, fsck will report 
> filesystem size (according to superblock) is xxxxxxxxxxxxxxxxxxx
> Physical size of device is yyyyyyyyyyyyyyyyyy
>  
> quit <y>
>  
> I am assuming drbd holds information about partition size differently to
> the OS.
>  
> I tried:
> # drbdadm resize all
> On both servers but I still get the same error.



-- 
: Lars Ellenberg                            Tel +43-1-8178292-0  :
: LINBIT Information Technologies GmbH      Fax +43-1-8178292-82 :
: Vivenotgasse 48, A-1120 Vienna/Europe    http://www.linbit.com :
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