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Re: How to format RAID1 correctly

To: stan hoeppner <stan@xxxxxxxxxxxxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxxx>, xfs@xxxxxxxxxxx
Subject: Re: How to format RAID1 correctly
From: Helmut Tessarek <tessarek@xxxxxxxxxxx>
Date: Tue, 23 Sep 2014 23:15:57 -0400
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <542234F6.4080000@xxxxxxxxxxxxxxxxx>
Openpgp: id=C11F128D
References: <5422146A.90206@xxxxxxxxxxx> <54222763.40107@xxxxxxxxxxx> <5422285B.6010306@xxxxxxxxxxx> <542234F6.4080000@xxxxxxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Thunderbird/31.1.1
On 23.09.14 23:05 , stan hoeppner wrote:
> It confuses many people who are new to md RAID1.  The above is the
> *bitmap* chunk size, not the array chunk size.  There is no array chunk
> size for RAID1 as there is no striping.  You must have striping to have
> chunks.  With md RAID1 every 4KB page write is simply mirrored to each
> physical disk.

Thanks for the info. I'm used to big ass storage subsystems, but new to SW
RAID. I seems I have some catching up to do.

regards Helmut K. C. Tessarek
lookup http://sks.pkqs.net for KeyID 0xC11F128D

   Thou shalt not follow the NULL pointer for chaos and madness
   await thee at its end.

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