Dave Miner wrote: > On 02/ 8/10 10:59 AM, Darren Reed wrote: >> Dave Miner wrote: >>> On 02/ 6/10 08:35 PM, Mike Gerdts wrote: >>>> On Sat, Feb 6, 2010 at 7:11 PM, Darren Reed<Darren.Reed at sun.com> >>>> wrote: >>> ... >>>>> I have one question for you and this proposal from Sanjay: >>>>> >>>>> What happens when an application stores peristent data >>>>> under a shared directory in /var and there are multiple BEs >>>>> that have their own version of this application and the >>>>> binary data format is not compatible? >>>> >>>> <sarcasm>You write a postinstall script that does the conversion as >>>> the relevant package is installed.</sarcasm> >>>> >>> >>> You provide a conversion method that's run as an SMF actuator! :-) >>> >>>> More seriously, I'm not really sure. I think that a snapshot is >>>> important to be able to provide fallback for when things go wrong and >>>> for when some sort of a data conversion is required and fallback is >>>> needed. This should not be as encumbered as a boot environment >>>> snapshot/clone. Hopefully the occurrences where such conversions are >>>> needed are kept to a minimum. Does data exist to suggest that this is >>>> a frequent occurrence? Does it typically happen with data in /var or >>>> data that is more likely to be kept in a pool other than rpool? >>>> >>> >>> It seems to be very infrequent, and there are other options, such as >>> the apache/apache2 scheme, that allow you to perhaps create a new >>> configuration based on the existing without disturbing the existing. >> >> On what basis do you say "very infrequent"? >> How many 3rd party applications have you surveyed? >> How many 3rd party applications that use /var have you surveyed? >> > > On the basis of the proposal, which is for a limited set of things > that have been quite stable over time to be moved into the shared dataset.
Having read your response, to me it sounds like there has not been enough research to warrant the entirity of /var being shared and that Sanjay's proposed approach (of making known, safe, data shared) is a much wiser approach. Darren
