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Re: 128TB filesystem limit?

To: david@xxxxxxx
Subject: Re: 128TB filesystem limit?
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Thu, 25 Mar 2010 23:35:28 -0500
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <alpine.DEB.2.00.1003251900110.12435@xxxxxxxxxxxxxx>
References: <alpine.DEB.2.00.1003251609160.12435@xxxxxxxxxxxxxx> <20100325235433.GM3335@dastard> <alpine.DEB.2.00.1003251702190.12435@xxxxxxxxxxxxxx> <20100326003511.GN3335@dastard> <alpine.DEB.2.00.1003251900110.12435@xxxxxxxxxxxxxx>
User-agent: Thunderbird 2.0.0.24 (Macintosh/20100228)
david@xxxxxxx wrote:
> On Fri, 26 Mar 2010, Dave Chinner wrote:

...

>> Is there any reason for putting partitions on these block devices?
>> You could just use the block devices without partitions, and that
>> will avoid alignment potential problems....
> 
> I would like to raid to auto-assemble and I can't do that without
> partitions, can I

I think you can.... it's not like MD is putting anything in the partition
table; you just give it block devices, I doubt it cares if it's a whole
disk or some partition.

Worth a check anyway ;)

...


> the next fun thing is figuring out what sort of stride, etc parameters I
> should have used for this filesystem.

mkfs.xfs should suss that out for you automatically based on talking to md;
of course you'd want to configure md to line up well with the hardware
alignment.

-Eric

> David Lang

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