Max mounted filesystems ?

Max mounted filesystems ?

[Frank Borich]

I cannot seem to increase the maximum number of
filesystems on my Red hat system running kernel
2.4.21-4.Elsmp.  I have already tried to increase
NR_SUPER in fs.h and fie-max, and file-nr in
/proc/sys/fs, this does not help.  When searching
through documentation I see references to super-max
file in /proc/sys/fs, but I do not see it on my system ?  Please CC me
on the reply as I am not on
the list.  

Thanks in Advance,

Frank

Re: Max mounted filesystems ?

[raven]

On Tue, 1 Mar 2005, Frank Borich wrote:

> I cannot seem to increase the maximum number of
> filesystems on my Red hat system running kernel
> 2.4.21-4.Elsmp.  I have already tried to increase
> NR_SUPER in fs.h and fie-max, and file-nr in
> /proc/sys/fs, this does not help.  When searching
> through documentation I see references to super-max
> file in /proc/sys/fs, but I do not see it on my system ?  Please CC me
> on the reply as I am not on
> the list.

What filesystem type?

Ian

RE: Max mounted filesystems ?

[Frank Borich]

Ext2, sorry. 

<-----Original Message-----
<From: raven@themaw.net [mailto:raven@themaw.net] 
<Sent: Tuesday, March 01, 2005 10:31 AM
<To: Frank Borich
<Cc: linux-fsdevel@vger.kernel.org
<Subject: Re: Max mounted filesystems ?
<
<On Tue, 1 Mar 2005, Frank Borich wrote:
<
<> I cannot seem to increase the maximum number of filesystems 
<on my Red 
<> hat system running kernel 2.4.21-4.Elsmp.  I have already tried to 
<> increase NR_SUPER in fs.h and fie-max, and file-nr in /proc/sys/fs, 
<> this does not help.  When searching through documentation I see 
<> references to super-max file in /proc/sys/fs, but I do not see it on 
<> my system ?  Please CC me on the reply as I am not on the list.
<
<What filesystem type?
<
<Ian
<
<

RE: Max mounted filesystems ?

[Ian Kent]

On Tue, 1 Mar 2005, Frank Borich wrote:

> Ext2, sorry. 

So how many filesystems do you need mounted?

> 
> <-----Original Message-----
> <From: raven@themaw.net [mailto:raven@themaw.net] 
> <Sent: Tuesday, March 01, 2005 10:31 AM
> <To: Frank Borich
> <Cc: linux-fsdevel@vger.kernel.org
> <Subject: Re: Max mounted filesystems ?
> <
> <On Tue, 1 Mar 2005, Frank Borich wrote:
> <
> <> I cannot seem to increase the maximum number of filesystems 
> <on my Red 
> <> hat system running kernel 2.4.21-4.Elsmp.  I have already tried to 
> <> increase NR_SUPER in fs.h and fie-max, and file-nr in /proc/sys/fs, 
> <> this does not help.  When searching through documentation I see 
> <> references to super-max file in /proc/sys/fs, but I do not see it on 
> <> my system ?  Please CC me on the reply as I am not on the list.
> <
> <What filesystem type?
> <
> <Ian
> <
> <
> 

Re: Max mounted filesystems ?

[Bryan Henderson]

>I cannot seem to increase the maximum number of
>filesystems on my Red hat system...

What is your evidence of the maximum that you can't increase?  (E.g. does 
something fail?  How?)

--
Bryan Henderson                               San Jose California
IBM Almaden Research Center                   Filesystems

RE: Max mounted filesystems ?

[Ian Kent]

On Wed, 2 Mar 2005, Frank Borich wrote:

> 118 total. When I attempt to mount the 57th one, I
> get "Too many mounted Filesystems"

Sorry I don't know what the limitations are for non-anonymous filesystems.
57 seems a bit unusual though.

> 
> __________________________________________________________________________________________
> From: Ian Kent [mailto:raven@themaw.net]
> Sent: Tue 3/1/2005 6:53 PM
> To: Frank Borich
> Cc: linux-fsdevel@vger.kernel.org
> Subject: RE: Max mounted filesystems ?
> 
> On Tue, 1 Mar 2005, Frank Borich wrote:
> 
> > Ext2, sorry.
> 
> So how many filesystems do you need mounted?
> 
> >
> > <-----Original Message-----
> > <From: raven@themaw.net [mailto:raven@themaw.net]
> > <Sent: Tuesday, March 01, 2005 10:31 AM
> > <To: Frank Borich
> > <Cc: linux-fsdevel@vger.kernel.org
> > <Subject: Re: Max mounted filesystems ?
> > <
> > <On Tue, 1 Mar 2005, Frank Borich wrote:
> > <
> > <> I cannot seem to increase the maximum number of filesystems
> > <on my Red
> > <> hat system running kernel 2.4.21-4.Elsmp.  I have already tried to
> > <> increase NR_SUPER in fs.h and fie-max, and file-nr in /proc/sys/fs,
> > <> this does not help.  When searching through documentation I see
> > <> references to super-max file in /proc/sys/fs, but I do not see it on
> > <> my system ?  Please CC me on the reply as I am not on the list.
> > <
> > <What filesystem type?
> > <
> > <Ian
> > <
> > <
> >
> 
> 
> 

Re: Max mounted filesystems ?

[Randy.Dunlap]

Ian Kent wrote:
> On Wed, 2 Mar 2005, Frank Borich wrote:
> 
> 
>>118 total. When I attempt to mount the 57th one, I
>>get "Too many mounted Filesystems"
> 
> 
> Sorry I don't know what the limitations are for non-anonymous filesystems.
> 57 seems a bit unusual though.

Is that the exact error message?
Can you post the kernel message log with that message in it?

I can't find that message in 2.4.21 (from kernel.org) and don't
have RH EL (?) to look at.

Have you asked Red Hat about this?

>>__________________________________________________________________________________________
>>From: Ian Kent [mailto:raven@themaw.net]
>>Sent: Tue 3/1/2005 6:53 PM
>>To: Frank Borich
>>Cc: linux-fsdevel@vger.kernel.org
>>Subject: RE: Max mounted filesystems ?
>>
>>On Tue, 1 Mar 2005, Frank Borich wrote:
>>
>>
>>>Ext2, sorry.
>>
>>So how many filesystems do you need mounted?
>>
>>
>>><-----Original Message-----
>>><From: raven@themaw.net [mailto:raven@themaw.net]
>>><Sent: Tuesday, March 01, 2005 10:31 AM
>>><To: Frank Borich
>>><Cc: linux-fsdevel@vger.kernel.org
>>><Subject: Re: Max mounted filesystems ?
>>><
>>><On Tue, 1 Mar 2005, Frank Borich wrote:
>>><
>>><> I cannot seem to increase the maximum number of filesystems
>>><on my Red
>>><> hat system running kernel 2.4.21-4.Elsmp.  I have already tried to
>>><> increase NR_SUPER in fs.h and fie-max, and file-nr in /proc/sys/fs,
>>><> this does not help.  When searching through documentation I see
>>><> references to super-max file in /proc/sys/fs, but I do not see it on
>>><> my system ?  Please CC me on the reply as I am not on the list.
>>><
>>><What filesystem type?

-- 
~Randy

Re: Max mounted filesystems ?

[Bryan Henderson]

>>>118 total. When I attempt to mount the 57th one, I
>>>get "Too many mounted Filesystems"
>> 
>> 
>> Sorry I don't know what the limitations are for non-anonymous 
filesystems.
>> 57 seems a bit unusual though.
>
>Is that the exact error message?
>Can you post the kernel message log with that message in it?

I don't think he said it was a kernel message.  And since the kernel has 
not traditionally issued a message when failing a mount for any reason, I 
suspect it's a message from the program doing the mount.  But I don't know 
how a mount program would recognize such a condition.  util-linux 'mount' 
has a message that includes "too many mounted filesystems" in a list of of 
possible reasons a mount may have failed.

By the way, it's always a good idea to use the -t (type) option on 
util-linux 'mount'.  You get better diagnostic information and less 
arbitrary behavior that way.  Without -t, 'mount' tries types until one 
works and can't tell the difference between a bad guess at the type and a 
legitimate mount failure.

RE: Max mounted filesystems ?

[Frank Borich]

Sorry for delayed response, I have been away...
I am currently in middle of extended testing on the same
storage, so I cannot reproduce the problem until next week.

I cannot remember the exact message, but this is pretty
Close:
"Unsupported filesystem type, or Too many mounted filesystems"

I know the filesystem type is supported because I already have 48
mounted.
  
When the test completes on Monday, I will capture exact output,
including
output from mount and system log.  

I really appreciate the time and responses !

Frank 

<-----Original Message-----
<From: Bryan Henderson [mailto:hbryan@us.ibm.com] 
<Sent: Thursday, March 03, 2005 3:55 PM
<To: Randy.Dunlap
<Cc: Frank Borich; linux-fsdevel@vger.kernel.org; Ian Kent
<Subject: Re: Max mounted filesystems ?
<
<>>>118 total. When I attempt to mount the 57th one, I get "Too many 
<>>>mounted Filesystems"
<>> 
<>> 
<>> Sorry I don't know what the limitations are for non-anonymous
<filesystems.
<>> 57 seems a bit unusual though.
<>
<>Is that the exact error message?
<>Can you post the kernel message log with that message in it?
<
<I don't think he said it was a kernel message.  And since the 
<kernel has not traditionally issued a message when failing a 
<mount for any reason, I suspect it's a message from the 
<program doing the mount.  But I don't know how a mount program 
<would recognize such a condition.  util-linux 'mount' 
<has a message that includes "too many mounted filesystems" in 
<a list of of possible reasons a mount may have failed.
<
<By the way, it's always a good idea to use the -t (type) 
<option on util-linux 'mount'.  You get better diagnostic 
<information and less arbitrary behavior that way.  Without -t, 
<'mount' tries types until one works and can't tell the 
<difference between a bad guess at the type and a legitimate 
<mount failure.
<
<

Re: Max mounted filesystems ?

[Andries Brouwer]

On Thu, Mar 03, 2005 at 02:06:07PM -0800, Frank Borich wrote:

> Sorry for delayed response, I have been away...
> I am currently in middle of extended testing on the same
> storage, so I cannot reproduce the problem until next week.
> 
> I cannot remember the exact message, but this is pretty
> Close:
> "Unsupported filesystem type, or Too many mounted filesystems"
> 
> I know the filesystem type is supported because I already have 48
> mounted.

If you upgrade your mount(8), the error message will no
longer mention "or too many mounted filesystems".
There is no definite limit in 2.4 or 2.6.

Of course the mount will fail just the same, and you'll have
to investigate why. Insufficient memory?