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тАО04-08-2011 04:50 AM
тАО04-08-2011 04:50 AM
umount and option -s
Yet an other silly question : umount has a "-s" option. But what does it stand for ?
I can't find any documentation about it. But it exists :
root@ockham:/#umount
usage: umount [-V] [-v] [-f] [-s] { special | directory }
umount [-F FStype] [-v] [-f] [-s] [-h host] -a
You can also find some comments, very few in fact, about -s in MC/ServiceGuard package configuration files ...
I guess it has the same behaviour than the same "-s" option in fsck : no sync is done when unmounting a FS.
Could someone point a document that will confirm or counter my understanding ?
Thanks in advance
Eric
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тАО04-08-2011 05:04 AM
тАО04-08-2011 05:04 AM
Re: umount and option -s
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тАО04-08-2011 05:57 AM
тАО04-08-2011 05:57 AM
Re: umount and option -s
But as far I remember "-s" option was also mentioned in package configuration files with HP-UX 11.23. Not sure with 11.11, but I think it was too.
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тАО04-08-2011 11:11 PM
тАО04-08-2011 11:11 PM
Re: umount and option -s
Looks like it's a really rare option and it is even more strange that it's hardly documented anywhere even in the manual page and there is_an_example with the -s option in the pkg configuration file!. And the only one point I could find is that -s with umount gives_better_performance.
Regards
Ismail Azad
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тАО04-11-2011 04:37 AM
тАО04-11-2011 04:37 AM
Re: umount and option -s
"Better performances". That's the heart of my question : better performances vs what ?
Eric
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тАО04-11-2011 09:42 AM
тАО04-11-2011 09:42 AM
Re: umount and option -s
Well that performance vs. what is a pretty difficult question as this mysterious option is documented in microscopic places. Well what I understood is this option when used in a SG environment with a package having many filesystems in turn increases the performance of the environment and looks like that is the most useful scenario in which the -s option is used and yes, I understand why you relate it to the -s option on fsck as the source says both fsck and umount should be used with the -s option. But exactly how -s accomplishes something related to "better performance" is a mystery to me but I TOTALLY understand why the no sync wild guess... :)
Regards
Ismail Azad
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тАО04-12-2011 05:01 AM
тАО04-12-2011 05:01 AM
Re: umount and option -s
So I will not use the umount "-s" option.
Thanks every one.
Eric