Messages in this thread | | | Date | Wed, 16 Oct 2002 09:05:18 +0800 | From | Michael Clark <> | Subject | Re: [ANNOUNCE] [PATCHES] Advanced TCA Hotswap Support in Linux Kernel |
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On 10/16/02 04:46, Steven Dake wrote: > The data/telecoms I've talked to require disk hotswap times of less then > 20 msec from notification of hotwap to blue led (a light used to > indicate the device can be removed). They would like 10 msec if it > could be done. This is because of how long it takes on a surprise > extraction for the hardware to send the signal vs the user to disconnect > the hardware.
I'm just surprised that the SAF-TE processers will respond this quickly.
> For legacy systems such as SAFTE hotswap, polling through sg at 10 msec > intervals would be extremely painful because of all the context > switches. A timer scheduled every 10 msec to send out a SCSI message > and handle a response if there is a hotswap event is a much better course.
100 context switchs a second isn't that much is it?
I'll adjust safte-monitor from its default 2 second polling down to 10msec and see what the result is.
~mc
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