RE: Ways to query RAID status - notification questions

RE: Ways to query RAID status - notification questions

[Vicky Gonzalez]

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 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
-- 

Sean C. Kormilo, STORM Software Architect, Nortel Networks
              email: skormilo@nortelnetworks.com
  

Re: Ways to query RAID status - notification questions

[Steven Dake]

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 
>>-
>>To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>>the body of a message to majordomo@vger.kernel.org
>>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>    
>>