RE: Software raid0 will crash the file-system, when each disk is 5TB

Jeff Zheng
2007-05-16T01:56:46Z

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@suse.de]
Sent: Wednesday, 16 May 2007 12:04 p.m.
To: Michal Piotrowski
Cc: Jeff Zheng; Ingo Molnar; linux-raid@vger.kernel.org;
linux-kernel@vger.kernel.org; linux-fsdevel@vger.kernel.org
Subject: Re: Software raid0 will crash the file-system, when each disk
is 5TB

On Wednesday May 16, michal.k.k.piotrowski@gmail.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