On 25 May 2011 11:51, Wahid Bhimji <[log in to unmask]> wrote:
> On 25 May 2011, at 11:47, Peter Grandi wrote:
>
>> On 25/05/11 11:13, Wahid Bhimji wrote:
>>
>>> [ ... ] Also from DPM 1.8.2 it will be possible to upgrade
>>> (using these non-official RPMs) if you are on SL4 but at
>>> that point installation from scratch on SL4 will not be
>>> supported even by them [ ... ]
>>
>> As to this, I remember some hints probably from SamS that
>>
>> * it is easy to upgrade the disk nodes from SL4/gLite 3.1 to
>> SL5/gLite 3.2 as they are effectively stateless;
Always true.
>> * upgrading the disk nodes should be done before upgrading the
>> DPM node;
>
> This point above is not correct. You can have either an SL5 headnode and SL4 disk nodes or SL5 disk nodes and SL4 headnode. You may chose to do the disk nodes first as they are easier as you say.
>
More generally: you can have any mix of SL5 and SL4 disk nodes that you want!
I would recommend upgrading the disk nodes first if it's going to be
problematic to have downtime, since the headnode is the only bit that
needs significant service interruption to deal with.
>> * a newer disk node will work with an older DPM node, so it does
>> not need to be done all at once.
>
That's true, with the caveat that the version of DPM that introduces
the new third-party rfio dpm-drain will break dpm-drain for nodes
still running the previous version (due to the move from gridftp to
rfio). This will probably be DPM 1.8.2 .
Sam
>
>> I hope that I have remembered right as that is what I am set to do.
>>
>
>
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