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Date:	Wed, 16 May 2007 13:56:35 +1200
From:	"Jeff Zheng" <Jeff.Zheng@...ace.com>
To:	"Neil Brown" <neilb@...e.de>,
	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>, <linux-raid@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>
Subject: RE: Software raid0 will crash the file-system, when each disk is 5TB

Here is the information of the created raid0. Hope it is enough.

Jeff

The crashing one:
md: bind<sdd>
md: bind<sde>
md: raid0 personality registered for level 0
md0: setting max_sectors to 4096, segment boundary to 1048575
raid0: looking at sde
raid0:   comparing sde(5859284992) with sde(5859284992)
raid0:   END
raid0:   ==> UNIQUE
raid0: 1 zones
raid0: looking at sdd
raid0:   comparing sdd(5859284992) with sde(5859284992)
raid0:   EQUAL
raid0: FINAL 1 zones
raid0: done.
raid0 : md_size is 11718569984 blocks.
raid0 : conf->hash_spacing is 11718569984 blocks.
raid0 : nb_zone is 2.
raid0 : Allocating 8 bytes for hash.
JFS: nTxBlock = 8192, nTxLock = 65536

The working one:
md: bind<sde>
md: bind<sdf>
md: bind<sdg>
md: bind<sdd>
md0: setting max_sectors to 4096, segment boundary to 1048575
raid0: looking at sdd
raid0:   comparing sdd(2929641472) with sdd(2929641472)
raid0:   END
raid0:   ==> UNIQUE
raid0: 1 zones
raid0: looking at sdg
raid0:   comparing sdg(2929641472) with sdd(2929641472)
raid0:   EQUAL
raid0: looking at sdf
raid0:   comparing sdf(2929641472) with sdd(2929641472)
raid0:   EQUAL
raid0: looking at sde
raid0:   comparing sde(2929641472) with sdd(2929641472)
raid0:   EQUAL
raid0: FINAL 1 zones
raid0: done.
raid0 : md_size is 11718565888 blocks.
raid0 : conf->hash_spacing is 11718565888 blocks.
raid0 : nb_zone is 2.
raid0 : Allocating 8 bytes for hash.
JFS: nTxBlock = 8192, nTxLock = 65536

-----Original Message-----
From: Neil Brown [mailto:neilb@...e.de] 
Sent: Wednesday, 16 May 2007 12:04 p.m.
To: Michal Piotrowski
Cc: Jeff Zheng; Ingo Molnar; linux-raid@...r.kernel.org;
linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org
Subject: Re: Software raid0 will crash the file-system, when each disk
is 5TB

On Wednesday May 16, michal.k.k.piotrowski@...il.com wrote:
> >
> > Anybody have a clue?
> >

No...
When a raid0 array is assemble, quite a lot of message get printed
about number of zones and hash_spacing etc.  Can you collect and post
those.  Both for the failing case (2*5.5T) and the working case
(4*2.55T) is possible.

NeilBrown
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