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From: "Steven Hartland" <killing@multiplay.co.uk>
To: "Daniel Kalchev" <daniel@digsys.bg>,
	"mxb" <mxb@alumni.chalmers.se>
References: <CABBFC07-68C2-4F43-9AFC-920D8C34282E@unixconn.com>
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 <2EF46A8C-6908-4160-BF99-EC610B3EA771@alumni.chalmers.se>
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Subject: Re: Slow resilvering with mirrored ZIL
Date: Wed, 3 Jul 2013 15:55:34 +0100
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----- Original Message ----- 
From: "Daniel Kalchev" <daniel@digsys.bg>
To: "mxb" <mxb@alumni.chalmers.se>
Cc: <freebsd-fs@freebsd.org>
Sent: Wednesday, July 03, 2013 3:40 PM
Subject: Re: Slow resilvering with mirrored ZIL


> 
> On 03.07.13 16:36, mxb wrote:
>> Well, then my question persists - why I get so significant drop of speed while resilvering second drive.
>> The only changes to the system are:
>>
>> 1. Second partition for ZIL to create a mirror
>> 2. New disks are 7200rpm. old ones are 5400rpm.
>>

Its not something like the old disks are 512byte sectors
where as the new ones are 4k?

It this is the case having already replaced one disk you've
killed performance as its having to do lots more work reading
none 4k aligned data?

    Regards
    steve

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