Re: Ways to query RAID status - notification questions

[Steven Dake <sdake@mvista.com>]

Vicky,

This is a good idea for a feature addition, but there currently is no 
select() support in the driver for reading events.

Vicky Gonzalez wrote:

>Thanks again for all of your help Sean!
>
>I thought I'd ask the rest of the folks here if there was a way for the MD driver to notify my process that something bad occurred or of a status change? So instead of me polling for status from the driver directly(using ioctls) or the mdadm(using ioctls & mdstat), can I register with the driver or and OS interrupt to catch something when changes occur?
>
>Thanks!
>~Vicky
>
>-----Original Message-----
>From: Sean Kormilo [mailto:skormilo@nortelnetworks.com]
>Sent: Monday, April 14, 2003 11:31 AM
>To: Vicky Gonzalez
>Cc: Linux-RAID mailinglist
>Subject: Re: Ways to query RAID status
>
>
>Vicky,
>
>It depends upon what you are trying to monitor, and how you are trying
>to monitor it.
>
>You have the following basic options:
>1) /proc/mdstat
>2) mdadm (from Neil Brown - should be many references to it on the
>mailing list archives)
>3) ioctl (if you want to query from a C program)
>
>The ioctl interface is missing the ability to query raid rebuild status.
>If that is something  which interests you, let me know as I created a
>small patch to add a new ioctl to query raid rebuild information.
>
>Sean. 
>
>
>  
>
>>Are the other ways to query the status of the RAID other than from querying the /proc/mdstat file? If I should ask a different list or need to look through the archives first , could someone please point me in the right direction.
>>
>>Many Thanks!
>>~Vicky 
>>-
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