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January 24th, 2013 15:00
NAS code file upgrade with file replication
Hello, I have a Unified VNX5500 with file replication. We are going to do an upgrade of the VNX5500 file code. Does anything need to happen with the file replication side? Do we have to pause syncronization or make sure that nas code versions are the same on each array? The array that is being upgraded is the target side for replication. Thanks, Rip
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etaljic81
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January 24th, 2013 17:00
The NAS code does not have to be the same. I would recommend you pause replication and resume it after the upgrade.
Rainer_EMC
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January 25th, 2013 07:00
Generally it works between different DART code versions – but sometimes (not very often) there are on-disk layout changes that require an upgrade
etaljic81
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January 25th, 2013 08:00
Rainer,
Can you clarify what you mean by "there are on-disk layout changes that require an upgrade". Curious what that means.
Thanks.
Rainer_EMC
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January 25th, 2013 10:00
Quite a while ago we did a change to enable quota’s larger than 4 TB – if you replicate from a system with a newer code than that to an older one you get inconsistencies.
Or replicate a deduplicated file system to a system with very old NAS code that doesn’t have deduplication implemented.
Similar with 7.1 – that contains changes for FLR enabled file systems to provide retention dates beyond 2038.
There I think we now block replication until you do a special conversion.
These are corner cases – typically we say that its ok for at least one product generation difference
Older to newer code is always easier than newer to older version
etaljic81
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January 25th, 2013 13:00
Good to know. Thank you.