Re: ata-disk ioctl and atactl patch
On Mon, Feb 26, 2001 at 08:28:56AM +0100, Soren Schmidt wrote: No its not safe at all, you risk trashing an already running command... Thanks for the feedback; that's exactly what I was concerned about. Anyhow, I have an atacontrol thingy in the works for attach/detach, raid control etc, etc, I'll try to merge this functionality into that (the ioctl's will change etc, but the functionality is nice)... Great. thanks again, -scott -- Scott Renfro [EMAIL PROTECTED] +1 650 906 9618 To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
Re: ata-disk ioctl and atactl patch
A couple of us on the questions list have asked for a way to spin down ide
disks when idle. Is there any chance that this utility could lead to
something useful there?
Steve Rose
It seems Scott Renfro wrote:
As I promised on -mobile earlier this week, I've cleaned up my patches
to port the {Net,Open}BSD atactl utility, including a simplistic
ata-disk ioctl. They apply cleanly against this afternoon's -stable
(including Soren's latest commit bringing -stable up to date with
-current). I've been running them for some time and they ''work great
here''.
Before announcing this in a broader context, I wanted to get a bit of
feedback on the ioctl implementation. In particular, is it safe to
just do an ata_command inside adioctl() without any further checking?
(e.g., can this cause bad things to happen under heavy i/o load?)
No its not safe at all, you risk trashing an already running command...
Anyhow, I have an atacontrol thingy in the works for attach/detach,
raid control etc, etc, I'll try to merge this functionality into that
(the ioctl's will change etc, but the functionality is nice)...
-S?ren
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Re: ata-disk ioctl and atactl patch
Well, for me it's the noise and heat that I'm trying to minimize. That
and we're out of power here in California. :-)
Steve Rose
On Mon, 26 Feb 2001, Soren Schmidt wrote:
It seems Stephen Rose wrote:
A couple of us on the questions list have asked for a way to spin down ide
disks when idle. Is there any chance that this utility could lead to
something useful there?
Well, of cause it could, but I'm not sure I see the usefullness of
the spindown at all, a spinup costs several units of idleness power,
so you have to keep it spun down for long periods to make it worth
the effort, and you wear significantly more on the mechanics this
way too...
It seems Scott Renfro wrote:
As I promised on -mobile earlier this week, I've cleaned up my patches
to port the {Net,Open}BSD atactl utility, including a simplistic
ata-disk ioctl. They apply cleanly against this afternoon's -stable
(including Soren's latest commit bringing -stable up to date with
-current). I've been running them for some time and they ''work great
here''.
Before announcing this in a broader context, I wanted to get a bit of
feedback on the ioctl implementation. In particular, is it safe to
just do an ata_command inside adioctl() without any further checking?
(e.g., can this cause bad things to happen under heavy i/o load?)
No its not safe at all, you risk trashing an already running command...
Anyhow, I have an atacontrol thingy in the works for attach/detach,
raid control etc, etc, I'll try to merge this functionality into that
(the ioctl's will change etc, but the functionality is nice)...
-S?ren
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-hackers" in the body of the message
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-Søren
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Re: ata-disk ioctl and atactl patch
Soren Schmidt [EMAIL PROTECTED], said on Mon Feb 26, 2001 [09:10:43 PM]: } It seems Stephen Rose wrote: } A couple of us on the questions list have asked for a way to spin down ide } disks when idle. Is there any chance that this utility could lead to } something useful there? } } Well, of cause it could, but I'm not sure I see the usefullness of } the spindown at all, a spinup costs several units of idleness power, } so you have to keep it spun down for long periods to make it worth } the effort, and you wear significantly more on the mechanics this } way too... Others have posted from their experiments that they were able to maintain a spun down state for upwards of an hour (admittedly, with some care and planning). There are also lots of odd uses where one might have long periods of inactivity, such as a laptop on which you log in to a "real machine" to do some kind of work, and want to leave the display going without having to listen to the disk (for whatever reason). I often leave mine listening for incoming messages for hours at a time, and appreciate being able to shut up the disk. I'm using a different method to accomplish the goal, but the desire that led me there is what's important for purposes of this discussion. Are there other ways to accomplish the same thing? Sure. But this desire isn't per se unreasonable on its face. It's not a good fit for lots of systems, but there are cases where it's desirable. -- Jon Hamilton [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
Re: ata-disk ioctl and atactl patch
It seems Scott Renfro wrote:
As I promised on -mobile earlier this week, I've cleaned up my patches
to port the {Net,Open}BSD atactl utility, including a simplistic
ata-disk ioctl. They apply cleanly against this afternoon's -stable
(including Soren's latest commit bringing -stable up to date with
-current). I've been running them for some time and they ''work great
here''.
Before announcing this in a broader context, I wanted to get a bit of
feedback on the ioctl implementation. In particular, is it safe to
just do an ata_command inside adioctl() without any further checking?
(e.g., can this cause bad things to happen under heavy i/o load?)
No its not safe at all, you risk trashing an already running command...
Anyhow, I have an atacontrol thingy in the works for attach/detach,
raid control etc, etc, I'll try to merge this functionality into that
(the ioctl's will change etc, but the functionality is nice)...
-Sren
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