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List:       evms-devel
Subject:    Re: [Evms-devel] Raid1 recovery speed
From:       Jan De Landtsheer <Jan () dct-mail ! com>
Date:       2005-03-22 8:38:08
Message-ID: 423FD970.2080205 () dct-mail ! com
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Mike Tran wrote:

>On Sun, 2005-03-20 at 20:28, John Muir wrote:
>  
>
>>Kevin Corry wrote:
>>
>>    
>>
>>>>exceed it. When speed_limit_min is 1000, the RAID mirrors only
>>>>synchronize at 1000MB/s even when the system is idle. When
>>>>   
>>>>
>>>>        
>>>>
>>>Perhaps there's something about 
>>>software-RAID on DM devices that confuses the MD driver into thinking it has 
>>>to run at the "min" speed limit. I'll see if I can look into it or talk to 
>>>Mike about it this week.
>>> 
>>>
>>>      
>>>
>>Kevin,
>>
>>Thanks for your reply.
>>
>>I will separately mirror lvm devices (created without EVMS) with MD to 
>>see if the same problem occurs.
>>
>>Obviously above I meant 1000KB/s (1MB/s) rather than 1000MB/s. I wish 
>>disks were that fast! ;-)
>>    
>>
>
>John, I concur with Kevin.  There should be no different in resync
>rate.  If you create DM devices and use other MD tools such as mdadm to
>create MD raid1/raid5 array, you should experience the same resync rate.
>
>--
>Regards,
>Mike T.
>  
>
This is what I saw too when creating a raid with EVMS. Resync (even the 
first and after a reboot) is @ speed_limit_min, echoing a higher number 
to speed_limit_min set the speed higher... speed_limit_max is not used, 
as I see it.
Jan


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