Re: I/O operations

["Peter Teoh" <htmldeveloper@xxxxxxxxx>]

On Sun, Jan 4, 2009 at 4:06 AM, Alexander Potashev <aspotashev@xxxxxxxxx> wrote:
> On 15:14 Sat 03 Jan     , Peter Teoh wrote:
>> Ok, how about this:   completely suspending all I/O can be done.   two
>> possible answer:
>>
>> 1.   suspension on root device:   reboot using a LiveCD, and mount the
>> rootfs as readonly.
>> 2.   suspension on non-root device:   unmount it first - after
>> removing all dependencies, remount as readonly.   now your device will
>> suspend all write but not read.
>
> It's possible to remount an fs read-only using
>
>        mount -o remount,ro <something>
>
> if there are no programs having files opened for writing (or O_RDWR) on
> this fs, but remounting while some programs have opened files with
> O_RDONLY is allowed.
>
>>
>> On Sat, Jan 3, 2009 at 4:34 AM, rohit vashist
>> <rohitvashist2kk3@xxxxxxxxx> wrote:
>> > Hi
>> >
>> > I went through the code of iostat.In the ninth field it gives the count of
>> > number of I/O,but it goes zero but it can be thought.
>> > Can u specify the grounds how hard it would to be suspend all the I/O
>> > currently on the device.
>> >
>> > Thanks
>> >
>> >

Thank you Alexander,

Coincidentally, there is another discussion on-going in LKML now:

http://www.gossamer-threads.com/lists/linux/kernel/1014526

Interesting.......





-- 
Regards,
Peter Teoh

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