RAID-related: SATA disk removal?

RAID-related: SATA disk removal?

[John Rowe]

I am testing a machine with two SATA drives in startech.com removable
caddies. Everything including swap is RAID1. (I'm running x86_64
Scientific Linux 4.2, a RedHat enterprise clone.)

Informal tests suggest that pulling out an active disk causes the whole
machine to hang up but removing a disk from the RAID arrays and pulling
it out gives the message: "nv_sata: Primary device removed" and
everything happily keeps running.

Is this a fair description? In practise do people find that following
the above allows a failed disk to be replaced without shutting down the
machine? 

Thanks

John

Re: RAID-related: SATA disk removal?

[Diego M. Vadell]

Hi John,
   I had to do the same some months ago. It turned out that it didn't worked, 
and there was a thread about this here

http://marc.theaimsgroup.com/?l=linux-raid&m=111851721408698&w=2

I will be more than happy to know that it does work for you now with recent 
kernels, but at that time there was still a lot of work to do.

 -- Diego.

On Friday 28 April 2006 12:55, John Rowe wrote:
> I am testing a machine with two SATA drives in startech.com removable
> caddies. Everything including swap is RAID1. (I'm running x86_64
> Scientific Linux 4.2, a RedHat enterprise clone.)
>
> Informal tests suggest that pulling out an active disk causes the whole
> machine to hang up but removing a disk from the RAID arrays and pulling
> it out gives the message: "nv_sata: Primary device removed" and
> everything happily keeps running.
>
> Is this a fair description? In practise do people find that following
> the above allows a failed disk to be replaced without shutting down the
> machine?
>
> Thanks
>
> John
>
>
> -
> 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

Re: RAID-related: SATA disk removal?

[John Rowe]

Your error output looks just like what I got on my screen when I just
removed the disk. Did you try removing it from the arrays first?
Basically warm-swap. Google suggests one or two people have tried it.

John

Re: RAID-related: SATA disk removal?

[Diego M. Vadell]

Hi,
  No, I didn't. I was trying to test what happened when the cable gets 
unplugged (maybe someone moving roughly the server) or the disk turning 
suddenly into a stone. But I didn't try that, and it looks like an 
interesting test.

Regards,
 -- Diego.

On Saturday 29 April 2006 12:46, John Rowe wrote:
> Your error output looks just like what I got on my screen when I just
> removed the disk. Did you try removing it from the arrays first?
> Basically warm-swap. Google suggests one or two people have tried it.
>
> John
>
>
> -
> 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