[linux-lvm] Linux RAID Resync and LVM

[linux-lvm] Linux RAID Resync and LVM

[Brian McCullough]

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I hope that somebody can offer some suggestions to counteract an issue
that I am having.

I have a server ( a little low on memory, I think ) that is trying to do
a resync on a Raid 1 disk pair that is under my LVM.  Unfortunately,
this is killing performance on the server, and the people that I serve
are working to a hard deadline.

Is there any way ( what is the procedure ) to "pause" the resync ( yes I
know that this is a BAD idea, but it is currently forecast to take
another 12 - 18 hours ) so that I can either restart or resume it in a
day or two when the deadline has passed?


Configuration:

/dev/md4 = /dev/hde1 ( disk 0 ), /dev/hdg1 ( disk 1 )

/dev/mapper/VGProjectData-lvol1 ( 1-4 ) built on /dev/md4.

I can mount and unmount the LVM partitions, but raidstop just comes back
with the "help" message.



Help!


Thank you,
Brian


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Re: [linux-lvm] Linux RAID Resync and LVM

[Luca Berra]

On Tue, Nov 02, 2004 at 07:26:03AM -0500, Brian McCullough wrote:
>Is there any way ( what is the procedure ) to "pause" the resync ( yes I
>know that this is a BAD idea, but it is currently forecast to take
>another 12 - 18 hours ) so that I can either restart or resume it in a
>day or two when the deadline has passed?
slow it, reduce the numbers in:
/proc/sys/dev/raid/speed_limit_max
/proc/sys/dev/raid/speed_limit_min

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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Re: [linux-lvm] Linux RAID Resync and LVM

[Brian McCullough]

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On Tue, Nov 02, 2004 at 03:02:11PM +0100, Luca Berra wrote:
> slow it, reduce the numbers in:
> /proc/sys/dev/raid/speed_limit_max
> /proc/sys/dev/raid/speed_limit_min


Luca,

You are a life saver!  I did as you suggested and the machine is usable
again.


( It will take a bit longer to resync but I will turn the numbers back
up when we get past the deadline. )


Brian


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