Lustre discuss - Jun 2012 - wrong free inode count on the client side with 1.8.7

Hi list,

the number of free inodes seems to be reported wrongly on the client side. If I
create files, the number of free inodes does not change. If I delete the files,
the number of free inodes increases. So, from a client perspective, if I repeat
to create and remove files, I can have more and more free inodes. I tried to
find a bug for this in Whamcloud''s database but could not find one.
''df -i'' for the mdt on the MDS looks OK.

I think behaviour is depicted here:
http://lists.lustre.org/pipermail/lustre-discuss/2011-July/015789.html

Right now I don''t think this is a big problem. Can this turn into a
real problem? Like when the number of free inodes as seen by the client exceeds
2^64 or  whatever is the limit there?


Michael

-- 

Dr.-Ing. Michael Kluge

Technische Universit?t Dresden
Center for Information Services and
High Performance Computing (ZIH)
D-01062 Dresden
Germany

Contact:
Willersbau, Room WIL A 208
Phone:  (+49) 351 463-34217
Fax:    (+49) 351 463-37773
e-mail: michael.kluge at tu-dresden.de
WWW:    http://www.tu-dresden.de/zih

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On 2012-06-20, at 12:33 AM, Michael Kluge wrote:
> the number of free inodes seems to be reported wrongly on the client side.
If I create files, the number of free inodes does not change. If I delete the
files, the number of free inodes increases. So, from a client perspective, if I
repeat to create and remove files, I can have more and more free inodes. I tried
to find a bug for this in Whamcloud''s database but could not find one.
''df -i'' for the mdt on the MDS looks OK.
> 
> I think behaviour is depicted here:
> http://lists.lustre.org/pipermail/lustre-discuss/2011-July/015789.html
> 
> Right now I don''t think this is a big problem. Can this turn into
a real problem? Like when the number of free inodes as seen by the client
exceeds 2^64 or  whatever is the limit there?
The free inode count reported for the MDT is min(inodes, blocks), so if the MDT
is getting full the free inodes count will be under-represented.  In the worst
case an external xattr block will be needed to store the layout for each inode.

If there are inodes used without allocating an xattr block (the common case)
then more inodes will be reported.  This is necessary for programs that
(naively) check statfs() to see if there is enough space in the filesystem for
some operation.  It will be possible to create at least as many files as
reported free inodes, assuming no other program is also creating files at the
same time.

Cheers, Andreas
--
Andreas Dilger                       Whamcloud, Inc.
Principal Lustre Engineer            http://www.whamcloud.com/

Hi, dear all
Cloud lustre client run on native Solaris system? if yes, how could it achieve
that?
Thanks in advance.




B.R.
Feng
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There is no native Lustre client for Solaris.  The most common solution to this
is to export Lustre from a Linux client via NFS and then mount it on the Solaris
client.

Cheers, Andreas

On 2012-06-24, at 20:39, zf5984599 <zf5984599 at gmail.com> wrote:
> Hi, dear all
> Cloud lustre client run on native Solaris system? if yes, how could it
achieve that?
> Thanks in advance.
>  
> B.R.
> Feng
>  
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss
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thanks for your response;)





B.R.
Zheng Feng


From: Andreas Dilger
Date: 2012-06-25 11:20
To: zf5984599
CC: lustre-discuss at lists.lustre.org
Subject: Re: [Lustre-discuss] could one native Solaris acted as one lustre
client?
There is no native Lustre client for Solaris.  The most common solution to this
is to export Lustre from a Linux client via NFS and then mount it on the Solaris
client.

Cheers, Andreas

On 2012-06-24, at 20:39, zf5984599 <zf5984599 at gmail.com> wrote:


Hi, dear all
Cloud lustre client run on native Solaris system? if yes, how could it achieve
that?
Thanks in advance.




B.R.
Feng

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