[Disksim-users] somebody knows how to handle the switch of the disk status:active/idle/standby/sleep?

[John Bucy]

So your setup is that you have a bunch of disks and at any given time,
some of them are active and some of them are sleeping or whatever and
you want the requests that map to disks that are on to issue
immediately and the ones that map to disks that are asleep to be
delayed for the disk to wake up?

I would expect that you'd have to implement that in the logorg code in
disksim.  Maybe you could introduce a special "wakeup" request that
you'd enqueue ahead of any request that accesses a disk that's asleep
and arrange for it to block everything else in the queue, etc.



john

On 11/16/06, 田磊 <raysmile at tom.com> wrote:
>
>
> Hi,
>
>     I am working on augmenting the support of the switch of the disk status,
> such as active, idle, standby, sleep in the disksim. And I have a problem.
>     If the current status of a disk is sleep while an I/O request arrives,
> the disk can not serve the request immediately and must wait for a period,
> call wake-up time, to serve it. So, the events in terms of the disk should
> be delayed till the disk is ready waked-up. considering the RAID
> configuration, only the corresponding events of the waking-up disks should
> be delayed and the other events for the other disks which are in the
> active/idle status should be handled without delay.
>     the question is: how can I do something in the disksim, to differentiate
> the events' cause by the different disks. If I block all of the events in
> the event loop once a disk is in the sleep status, it leads to an unfair and
> wrong result.
>     any suggestion is appreciated.
>
>
> Lei Tian
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