[DRBD-user] Migrating from x32 to x64

N.J. van der Horn (Nico) nico at vanderhorn.nl
Wed Nov 28 02:23:22 CET 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

I moved 2 disks of 750GB each from a openSUSE-10.0_x86 to
openSUSE-10.3_x86_64 without problems.
The version of DRBD was in the old cluster 8.0.0 and in the new cluster
8.0.6 at that moment.
I started to build the new cluster whit openSUSE-10.3-RC1, only had some
SATA driver issues.
On top of the /dev/drbd0 and /dev/drbd1 are 20 reiserfilesystems on
I was very carefull and took several measures to safeguard my data by
making backup's, taking at least 2 days.
But it proved to work without any problem, and still does after almost 2
months i think.
This is not just because i am a lucky person, but because DRBD is a
mature solution ;-)
In other words: thanks for this product from a happy redundant
replication technology user.
This does not mean that you will be lucky too, but this is my experiance
/ testimony ;-)

Nico van der Horn

Lars Ellenberg schreef:
> On Tue, Nov 27, 2007 at 11:38:55PM +0100, Laurent CARON wrote:
>> Hi,
>> I'm about to migrate several DRBD servers from x32 to x64.
>> Will I need to re-create meta-data area, or is it compatible between 32 
>> and 64 bit ?
>> Is there any known caveat about migrating that kind of setup ?
> we tried hard to be compatible between architechtures,
>   32/64 bit as well as endianess.
> on disk meta data is architecture safe.
> wire protocol is suposedly architechture safe.
> but it has just recently been pointed out that our use of bitfields for
> drbd internal state information exchange on the wire is not endian safe.
> we used to have a test cluster pentium <-> alpha,
> (only the old alpha is no longer up to it).
> as long as you stay within the same endianess,
>  32 <-> 64 is not a problem,
> so there should be no problem doing a rolling upgrade
> from x86 to x86_64
Behandeld door / Handled by: N.J. van der Horn (Nico)
ICT Support Vanderhorn IT-works, www.vanderhorn.nl,
Voorstraat 55, 3135 HW Vlaardingen, The Netherlands,
Tel +31 10 2486060, Fax +31 10 2486061

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