remounting with a different blocksize

remounting with a different blocksize

[Amir Hermelin]

Hi,
I'm using RH Linux 2.4.20 on both machines.  When I first mount one of =
the
machines with a 4k read/write blocksize, the READ requests are 4K bytes.
However, when I umount and then mount again with read/write blocksize of =
8K,
the READ requests are still 4K bytes.

Any ideas on how I can properly change the blocksizes?

Thanks,
Amir.




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Re: remounting with a different blocksize

[Steve Dickson]

Amir Hermelin wrote:

>I'm using RH Linux 2.4.20 on both machines.  When I first mount one of the
>machines with a 4k read/write blocksize, the READ requests are 4K bytes.
>However, when I umount and then mount again with read/write blocksize of 8K,
>the READ requests are still 4K bytes.
>
>Any ideas on how I can properly change the blocksizes?
>
I just ran a quick experiment on with my 2.4.20 kernel and everything
seem to work as expected... How are you verifying the blocks sizes?

SteveD.




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RE: remounting with a different blocksize

[Amir Hermelin]

Steve,
I turn on nfsd debugging using '/sbin/sysctl -w =
sunrpc.nfsd_debug=3D65535'.
There I see that the READ requests come in 4k blocks.  Other than that =
the
operation works fine (since both the client and the server agree on this
4k).

Amir.


-----Original Message-----
From: nfs-admin@lists.sourceforge.net
[mailto:nfs-admin@lists.sourceforge.net] On Behalf Of Steve Dickson
Sent: =E3 17 =F1=F4=E8=EE=E1=F8 2003 12:57
To: Amir Hermelin
Cc: nfs@lists.sourceforge.net
Subject: Re: [NFS] remounting with a different blocksize



Amir Hermelin wrote:

>I'm using RH Linux 2.4.20 on both machines.  When I first mount one of=20
>the machines with a 4k read/write blocksize, the READ requests are 4K=20
>bytes. However, when I umount and then mount again with read/write=20
>blocksize of 8K, the READ requests are still 4K bytes.
>
>Any ideas on how I can properly change the blocksizes?
>
I just ran a quick experiment on with my 2.4.20 kernel and everything =
seem
to work as expected... How are you verifying the blocks sizes?

SteveD.




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RE: remounting with a different blocksize

[Lever, Charles]

hi amir-

using "rsize=3D8192" means the client *can* use 8KB reads,
it doesn't mean that it *always* will.  there are a variety
of reasons the client might choose 4KB reads even though
it could send larger ones.

can you describe your workload?

> -----Original Message-----
> From: Amir Hermelin [mailto:amir@montilio.com]
> Sent: Wednesday, September 17, 2003 2:45 AM
> To: nfs@lists.sourceforge.net
> Subject: [NFS] remounting with a different blocksize
>=20
>=20
> Hi,
> I'm using RH Linux 2.4.20 on both machines.  When I first=20
> mount one of the
> machines with a 4k read/write blocksize, the READ requests=20
> are 4K bytes.
> However, when I umount and then mount again with read/write=20
> blocksize of 8K,
> the READ requests are still 4K bytes.
>=20
> Any ideas on how I can properly change the blocksizes?
>=20
> Thanks,
> Amir.
>=20
>=20
>=20
>=20
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Welcome to geek heaven.
> http://thinkgeek.com/sf
> _______________________________________________
> NFS maillist  -  NFS@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/nfs
>=20


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RE: remounting with a different blocksize

[Amir Hermelin]

I'm really only running a small and specific number of tests, one READ =
at a
time, files ranging from 8K to 256MB.  Is there any place I can read =
about
the reasons why my client (Linux 2.4) isn't using the blocksize I need?

Thanks,
Amir.



-----Original Message-----
From: nfs-admin@lists.sourceforge.net
[mailto:nfs-admin@lists.sourceforge.net] On Behalf Of Lever, Charles
Sent: =E3 17 =F1=F4=E8=EE=E1=F8 2003 17:21
To: Amir Hermelin
Cc: nfs@lists.sourceforge.net
Subject: RE: [NFS] remounting with a different blocksize


hi amir-

using "rsize=3D8192" means the client *can* use 8KB reads,
it doesn't mean that it *always* will.  there are a variety
of reasons the client might choose 4KB reads even though
it could send larger ones.

can you describe your workload?

> -----Original Message-----
> From: Amir Hermelin [mailto:amir@montilio.com]
> Sent: Wednesday, September 17, 2003 2:45 AM
> To: nfs@lists.sourceforge.net
> Subject: [NFS] remounting with a different blocksize
>=20
>=20
> Hi,
> I'm using RH Linux 2.4.20 on both machines.  When I first
> mount one of the
> machines with a 4k read/write blocksize, the READ requests=20
> are 4K bytes.
> However, when I umount and then mount again with read/write=20
> blocksize of 8K,
> the READ requests are still 4K bytes.
>=20
> Any ideas on how I can properly change the blocksizes?
>=20
> Thanks,
> Amir.
>=20
>=20
>=20
>=20
> -------------------------------------------------------
> This sf.net email is sponsored by:ThinkGeek
> Welcome to geek heaven.
> http://thinkgeek.com/sf=20
> _______________________________________________
> NFS maillist  -  NFS@lists.sourceforge.net=20
> https://lists.sourceforge.net/lists/listinfo/nfs
>=20


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