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Re: block alignment

To: "Bradley C. Kuszmaul" <kuszmaul@xxxxxxxxx>
Subject: Re: block alignment
From: Ben Myers <bpm@xxxxxxx>
Date: Mon, 7 Jan 2013 15:42:00 -0600
Cc: xfs@xxxxxxxxxxx
In-reply-to: <CAKSyJXdP0NSQrR+rfrCec+oCyVg-2SRmCmYf3V7kjC1-0x49bA@xxxxxxxxxxxxxx>
References: <CAKSyJXdP0NSQrR+rfrCec+oCyVg-2SRmCmYf3V7kjC1-0x49bA@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
Hey Bradley,

On Mon, Jan 07, 2013 at 04:33:18PM -0500, Bradley C. Kuszmaul wrote:
> What is the largest data block size that I'm likely to run into with xfs?

4k blocks is what to expect unless you are using larger pages.

>From mkfs.xfs manpage:
"       -b block_size_options
                This option specifies the fundamental block size of the filesys‐
                tem.  The valid block_size_options are: log=value or  size=value
                and  only  one  can  be  supplied.   The block size is specified
                either as a base two logarithm value with log=, or in bytes with
                size=.   The default value is 4096 bytes (4 KiB), the minimum is
                512, and the maximum is 65536 (64 KiB).  XFS on Linux  currently
                only supports pagesize or smaller blocks."


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