[lvm-devel] [PATCH] DM RAID: Add ability to throttle sync operations for RAID LVs.
jbrassow at redhat.com
Fri May 31 14:36:37 UTC 2013
On May 31, 2013, at 2:36 AM, Zdenek Kabelac wrote:
> Dne 30.5.2013 23:15, Jonathan Brassow napsal(a):
>> Please take a look at the following patch that adds throttling for RAID
>> sync operations. Any feedback on what the 'lvs' header should look like
>> when reporting the min/max recovery rate would be helpful also. (Right
>> now it is MinSync and MaxSync.)
>> This patch adds the ability to set the minimum and maximum I/O rate for
>> sync operations in RAID LVs. The options are available for 'lvcreate' and
>> 'lvchange' and are as follows:
>> --minrecoveryrate <Rate>
>> --maxrecoveryrate <Rate>
>> The rate is specified in kiB/sec/disk. Setting the rate to 0 removes the
> Patch seems to be missing libdm API extension to set min/max rates.
I had already put those in previously - see 'dm_tree_node_raid_params' and 'dm_tree_node_add_raid_target_with_params()'.
> Maybe the argument for min/max should be specified in 'size' units/second.
> So you could easily say 1M - just like with other args where we give size.
That sounds like a good idea.
>> +.RB [ \-\-maxrecoveryrate " " \fIRate\fP ]
>> +.RB [ \-\-minrecoveryrate " " \fIRate\fP ]
> .RB [ \-\-minrecoveryrate
> .IB Rate ]
Ok, will do.
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