From: nan@matt.ksu.ksu.edu (Nan Zou) Subject: Re: fsck on mounted file systems? Date: 14 Apr 1993 23:33:40 -0500
sct@dcs.ed.ac.uk (Stephen Tweedie) writes:
>hwrvo@kato.lahabra.chevron.com (W.R. Volz) writes:
>> I noticed that someone said that fsck should be run on
>> unmounted file systems. Then how does run it on the
>> filesystem that contains fsck? Is this a studip question
>> or what? Inquiring minds want to know.
>As long as there is no other disk activity going on, it is safe to run
>fsck on a mounted partition just to check the correctness of the
>partition. However, if you are using the -r or -a options to repair a
>filesystem, then there are basically two safe ways to go about it:
[...]
>* Using the latest kernel, elect to mount the root filesystem
> readonly; upon boot, run fsck on the partition, and once that has
> finished, remount root for writing and mount the other partitions.
If the root filesystem is mounted readonly, how can fsck write back
corrections if it finds errors?
-- Nan