Pathvec messages

Pathvec messages

[Sajesh Singh]

Whenever I run the multipath -v3 command on a EL 5 server I see the 
following line in the output for each device.

sdc: not found in pathvec

I have seen questions on this before, but no answer as to what this 
means. Is the message merely information or does the multipath 
configuration need to be changed?

Regards,

Sajesh

Re: Pathvec messages

[Benjamin Marzinski]

On Tue, Jul 29, 2008 at 12:51:42PM -0400, Sajesh Singh wrote:
> Whenever I run the multipath -v3 command on a EL 5 server I see the 
> following line in the output for each device.
>
> sdc: not found in pathvec

This simply means that the device is not already stored in multipath's
in memory list of discovered paths. It's completely normal to see this
for your all your devices when running the multipath command.

-Ben

> I have seen questions on this before, but no answer as to what this means. 
> Is the message merely information or does the multipath configuration need 
> to be changed?
>
> Regards,
>
> Sajesh
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel

Re: Pathvec messages

[Sajesh Singh]

[-- Attachment #1.1: Type: text/plain, Size: 1304 bytes --]


________________________________________________________
Sajesh Singh                           
Senior Systems Administrator                   
American Museum of Natural History     
Central Park West at 79th Street       
New York, NY 10024                     
                                       
(O) (212) 313-7263                     
(C) (917) 577-9195                     
(E) ssingh@amnh.org



Benjamin Marzinski wrote:
> On Tue, Jul 29, 2008 at 12:51:42PM -0400, Sajesh Singh wrote:
>   
>> Whenever I run the multipath -v3 command on a EL 5 server I see the 
>> following line in the output for each device.
>>
>> sdc: not found in pathvec
>>     
>
> This simply means that the device is not already stored in multipath's
> in memory list of discovered paths. It's completely normal to see this
> for your all your devices when running the multipath command.
>
> -Ben
>
>   
That being said, when does the device make it into the memory list of 
discovered paths ?
>> I have seen questions on this before, but no answer as to what this means. 
>> Is the message merely information or does the multipath configuration need 
>> to be changed?
>>
>> Regards,
>>
>> Sajesh
>>
>> --
>> dm-devel mailing list
>> dm-devel@redhat.com
>> https://www.redhat.com/mailman/listinfo/dm-devel
>>     

[-- Attachment #1.2: Type: text/html, Size: 2140 bytes --]

[-- Attachment #2: Type: text/plain, Size: 0 bytes --]

Re: Pathvec messages

[Benjamin Marzinski]

On Tue, Jul 29, 2008 at 01:34:47PM -0400, Sajesh Singh wrote:
>  ________________________________________________________
>  Sajesh Singh
>  Senior Systems Administrator
>  American Museum of Natural History
>  Central Park West at 79th Street
>  New York, NY 10024
> 
>  (O) (212) 313-7263
>  (C) (917) 577-9195
>  (E) [1]ssingh@amnh.org
> 
>    Benjamin Marzinski wrote:
> 
>  On Tue, Jul 29, 2008 at 12:51:42PM -0400, Sajesh Singh wrote:
> 
> 
>  Whenever I run the multipath -v3 command on a EL 5 server I see the
>  following line in the output for each device.
> 
>  sdc: not found in pathvec
> 
> 
>  This simply means that the device is not already stored in multipath's
>  in memory list of discovered paths. It's completely normal to see this
>  for your all your devices when running the multipath command.
> 
>  -Ben
> 
> 
> 
>    That being said, when does the device make it into the memory list of
>    discovered paths ?

Immediately after multipath realizes that it's not there.  In
multipathd, which uses the same code, you will see this when multipath
first spots a new device.  After that, the device will be list of
discovered paths. 

-Ben
 
>  I have seen questions on this before, but no answer as to what this means.
>  Is the message merely information or does the multipath configuration need
>  to be changed?
> 
>  Regards,
> 
>  Sajesh
> 
>  --
>  dm-devel mailing list
>  [2]dm-devel@redhat.com
>  [3]https://www.redhat.com/mailman/listinfo/dm-devel
> 
> 
> References
> 
>    Visible links
>    1. mailto:ssingh@amnh.org
>    2. mailto:dm-devel@redhat.com
>    3. https://www.redhat.com/mailman/listinfo/dm-devel

Re: Pathvec messages

[Sajesh Singh]

[-- Attachment #1.1: Type: text/plain, Size: 1552 bytes --]



Benjamin Marzinski wrote:
> On Tue, Jul 29, 2008 at 01:34:47PM -0400, Sajesh Singh wrote:
>   
>>  
>>    Benjamin Marzinski wrote:
>>
>>  On Tue, Jul 29, 2008 at 12:51:42PM -0400, Sajesh Singh wrote:
>>
>>
>>  Whenever I run the multipath -v3 command on a EL 5 server I see the
>>  following line in the output for each device.
>>
>>  sdc: not found in pathvec
>>
>>
>>  This simply means that the device is not already stored in multipath's
>>  in memory list of discovered paths. It's completely normal to see this
>>  for your all your devices when running the multipath command.
>>
>>  -Ben
>>
>>
>>
>>    That being said, when does the device make it into the memory list of
>>    discovered paths ?
>>     
>
> Immediately after multipath realizes that it's not there.  In
> multipathd, which uses the same code, you will see this when multipath
> first spots a new device.  After that, the device will be list of
> discovered paths. 
>
> -Ben
>   
So running multipath -v3 multiple times and seeing the output of "not 
found in pathvec" is merely informational?
>  
>   
>>  I have seen questions on this before, but no answer as to what this means.
>>  Is the message merely information or does the multipath configuration need
>>  to be changed?
>>
>>  Regards,
>>
>>  Sajesh
>>
>>  --
>>  dm-devel mailing list
>>  [2]dm-devel@redhat.com
>>  [3]https://www.redhat.com/mailman/listinfo/dm-devel
>>
>>
>> References
>>
>>    Visible links
>>    1. mailto:dm-devel@redhat.com
>>    2. https://www.redhat.com/mailman/listinfo/dm-devel
>>     

[-- Attachment #1.2: Type: text/html, Size: 2369 bytes --]

[-- Attachment #2: Type: text/plain, Size: 0 bytes --]

Re: Pathvec messages

[Benjamin Marzinski]

On Tue, Jul 29, 2008 at 03:43:32PM -0400, Sajesh Singh wrote:
>    Benjamin Marzinski wrote:
> 
>  On Tue, Jul 29, 2008 at 01:34:47PM -0400, Sajesh Singh wrote:
> 
> 
> 
>     Benjamin Marzinski wrote:
> 
>   On Tue, Jul 29, 2008 at 12:51:42PM -0400, Sajesh Singh wrote:
> 
> 
>   Whenever I run the multipath -v3 command on a EL 5 server I see the
>   following line in the output for each device.
> 
>   sdc: not found in pathvec
> 
> 
>   This simply means that the device is not already stored in multipath's
>   in memory list of discovered paths. It's completely normal to see this
>   for your all your devices when running the multipath command.
> 
>   -Ben
> 
> 
> 
>     That being said, when does the device make it into the memory list of
>     discovered paths ?
> 
> 
>  Immediately after multipath realizes that it's not there.  In
>  multipathd, which uses the same code, you will see this when multipath
>  first spots a new device.  After that, the device will be list of
>  discovered paths.
> 
>  -Ben
> 
> 
>    So running multipath -v3 multiple times and seeing the output of "not
>    found in pathvec" is merely informational?
> 

Correct.

-Ben
> 
> 
> 
>   I have seen questions on this before, but no answer as to what this means.
>   Is the message merely information or does the multipath configuration need
>   to be changed?
> 
>   Regards,
> 
>   Sajesh
> 
>   --
>   dm-devel mailing list
>   [[1]2]dm-devel@redhat.com
>   [3][2]https://www.redhat.com/mailman/listinfo/dm-devel
> 
> 
>  References
> 
>     Visible links
>     1. [3]mailto:dm-devel@redhat.com
>     2. [4]https://www.redhat.com/mailman/listinfo/dm-devel
> 
> 
> References
> 
>    Visible links
>    1. mailto:2]dm-devel@redhat.com
>    2. https://www.redhat.com/mailman/listinfo/dm-devel
>    3. mailto:dm-devel@redhat.com
>    4. https://www.redhat.com/mailman/listinfo/dm-devel