linux-kernel - Re: Howto tell kernel to use 4096 as granularity & minimum size?

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Message-ID: <53CD7BE2.3040909@tlinx.org>
Date:	Mon, 21 Jul 2014 13:45:22 -0700
From:	Linda Walsh <lkml@...nx.org>
To:	Dave Chinner <david@...morbit.com>
CC:	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Howto tell kernel to use 4096 as granularity & minimum size?

Dave Chinner wrote:
>
>> I can partition the disk and setup the allocation size
>> to 4096, but I'd like to tell the kernel to use a
>> virtual-size of 4096 for the sector as an additional
>> performance 'hint', so nothing will even try to use
>> smaller i/o's than that.
>>     
>
> Just format the filesystem with 4k sector size.
---
    Good idea,  though.. I wanted to set it for the whole "disk"(array)
as it (multiple 4T drives) will be subdivided into multiple filesystems
and have lvm and a partition table under the file system(s),
so telling the kernel to only do 4K alloc+io's to the whole thing
would cover the most with the least.




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