[Samba] Real-time file synchronisation
shobson-lists at colony.com
Thu Sep 30 15:46:31 GMT 2004
Chris Ricks wrote:
> > A few questions to think about :
>> How often do you update the application ? If it's only every few
>> months, then there's no problem.
>"Updates" are done every now and then, but very rarely for binaries. Most
>updates take the form of replacing report files (of the order of 100KB).
>This sort of update happens every few months.
Then I find it hard to see any problem at all.
> > Do you ever do it while users are working ? Well you shouldn't be !
>> And what does the vendor propose to do about the problem of changing
>> a binary whilst it is in use ? Having said that, I have done in-place
>> upgrades on Unix systems by MOVING the original file and slipping the
>> new one into place - if it's in use then the system will continue to
>> use the old file (referenced by inode no, not file name) until it is
>An excellent point. They often do such things whilst people are working. If
>I recall correctly, Windows' VM model does not horde executable data in swap
>space (which is why compressed executables stay compressed or something -
>I'd have to look at UPX's docs). Considering it's Windows, I don't like the
>idea of trying to move such things around, even if Windows should lock
>Further, do you know offhand if the trick you use above carries across the
>UNIX-Windows divide that Samba takes care of? I know that Samba will use FDs
>to reference things, but SMB is a complicated protocol...
In principal, but I know Samba has it's own locking mechanism and I
don't know if that works by file name or file id - hopefully one of
the people with knowledge of the internal could answer that one.
As long as the Samba locking uses inodes and not filenames, then I
see no reason it shouldn't work.
Simon Hobson MA MIEE, Technology Specialist
Colony Gift Corporation Limited
Lindal in Furness, Ulverston, Cumbria, LA12 0LD
Tel 01229 461100, Fax 01229 461101
Registered in England No. 1499611
Regd. Office : 100 New Bridge Street, London, EC4V 6JA.
More information about the samba