[linux-lvm] How do I tell what disk a volume group reside on

[linux-lvm] How do I tell what disk a volume group reside on

[Vickie Troy-McKoy]

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Hi All,

 

I have a RedHat4 server connected to a SAN 3510 Array.  On the host server, there are two volume groups set up--root_vg and san_vg.  I'm assuming that root_vg resides on the internal disks and san_vg on the SAN.  But, how can I check to make sure this is the case?

 

Thank you,



  		 	   		  
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Re: [linux-lvm] How do I tell what disk a volume group reside on

[Phillip Susi]

You appear to have intended to start a new thread completely unrelated
to the thread "How do I properly backup and restore / on LVM2" but
instead of composing a new message, you chose to reply to one in that
thread.  Please do not do this.  When you reply, threaded mail readers
show your message in the thread you reply to instead of as a new
thread, even when you change the subject.  If you are starting a new
thread, then start a new message instead of replying to an existing one.

On Tue, 13 Apr 2010 20:59:40 -0400
Vickie Troy-McKoy <vtmckoy@hotmail.com> wrote:

> 
> Hi All,
> 
>  
> 
> I have a RedHat4 server connected to a SAN 3510 Array.  On the host
> server, there are two volume groups set up--root_vg and san_vg.  I'm
> assuming that root_vg resides on the internal disks and san_vg on the
> SAN.  But, how can I check to make sure this is the case?
> 
>  
> 
> Thank you,
> 
> 
> 
>   		 	   		  
> _________________________________________________________________
> The New Busy is not the old busy. Search, chat and e-mail from your
> inbox.
> http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_3

[linux-lvm] nevermind

[Phillip Susi]

On Tue, 13 Apr 2010 22:28:02 -0400
Phillip Susi <psusi@cfl.rr.com> wrote:

> You appear to have intended to start a new thread completely unrelated
> to the thread "How do I properly backup and restore / on LVM2" but
> instead of composing a new message, you chose to reply to one in that
> thread.  Please do not do this.  When you reply, threaded mail readers
> show your message in the thread you reply to instead of as a new
> thread, even when you change the subject.  If you are starting a new
> thread, then start a new message instead of replying to an existing
> one.

Nevermind.  I'm trying out a new mail client and I'm the one that got
confused.

Re: [linux-lvm] How do I tell what disk a volume group reside on

[linuxmails.lists]

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Hi

Assuming that you are using MPIO , have you compared the output of  
fdisk -l to the dm device names in /dev/mpath?

AT

On Tue, 13 Apr 2010 20:59:40 -0400
Vickie Troy-McKoy <vtmckoy@hotmail.com> wrote:

>
> Hi All,
>
>
> I have a RedHat4 server connected to a SAN 3510 Array.  On the host
> server, there are two volume groups set up--root_vg and san_vg.  I'm
> assuming that root_vg resides on the internal disks and san_vg on the
> SAN.  But, how can I check to make sure this is the case?
>
>
> Thank you,
>



>>

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Re: [linux-lvm] How do I tell what disk a volume group reside on

[Vickie Troy-McKoy]

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Hi,

 

For the device in question, I did: "fdisk -l /dev/md10".  I received the following output:

 

Disk /dev/md10: 73.2 GB, 73270689792 bytes
2 heads, 4 sectors/track, 17888352 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

Disk /dev/md10 doesn't contain a valid partition table


 

However, when I list out /dev/mpath, I get the following:

 

 ls -lrt
total 0
lrwxrwxrwx  1 root root 7 Mar 26 07:28 mpath3 -> ../dm-8
lrwxrwxrwx  1 root root 8 Mar 26 07:28 mpath3p1 -> ../dm-10
lrwxrwxrwx  1 root root 7 Mar 26 07:28 mpath2p1 -> ../dm-9
lrwxrwxrwx  1 root root 7 Mar 26 07:28 mpath2 -> ../dm-7

 

How do I interpret this output?  Does it mean the absence of "md10" means that it resides on the internal drive.  I know that /dev/dm-9 and /dev/dm-10 reside on the SAN.  But, I guess I was looking for a more concrete way to tie /dev/md10 to the attached devices in /proc/scsi/scsi so that I can definitely say it's on the FUJITSU drive or on the SUN StorEdge 3510.

 

Thank you,


 



From: linuxmails.lists@gmail.com
To: linux-lvm@redhat.com
Date: Wed, 14 Apr 2010 00:36:37 -0500
Subject: Re: [linux-lvm] How do I tell what disk a volume group reside on


Hi


Assuming that you are using MPIO , have you compared the output of fdisk -l to the dm device names in /dev/mpath? 


AT


On Tue, 13 Apr 2010 20:59:40 -0400
Vickie Troy-McKoy <vtmckoy@hotmail.com> wrote:



Hi All,




I have a RedHat4 server connected to a SAN 3510 Array.  On the host

server, there are two volume groups set up--root_vg and san_vg.  I'm

assuming that root_vg resides on the internal disks and san_vg on the

SAN.  But, how can I check to make sure this is the case?




Thank you,











 		 	   		  
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Re: [linux-lvm] How do I tell what disk a volume group reside on

[Luca Berra]

On Tue, Apr 13, 2010 at 08:59:40PM -0400, Vickie Troy-McKoy wrote:
>
>Hi All,
>
> 
>
>I have a RedHat4 server connected to a SAN 3510 Array.  On the host server, there are two volume groups set up--root_vg and san_vg.  I'm assuming that root_vg resides on the internal disks and san_vg on the SAN.  But, how can I check to make sure this is the case?
>
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

try with the pvs command

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Re: [linux-lvm] How do I tell what disk a volume group reside on

[brem belguebli]

or vgdisplay -v root_vg
and vgdisplay -v san_vg 

will give you the PV's for each of your VG's

then to identify if the physical disks are the ones from the SAN use
scsi_id command that'll help you

scsi_id -g 0x80 -d /dev/sdX 

 
On Wed, 2010-04-14 at 07:21 +0200, Luca Berra wrote:
> On Tue, Apr 13, 2010 at 08:59:40PM -0400, Vickie Troy-McKoy wrote:
> >
> >Hi All,
> >
> > 
> >
> >I have a RedHat4 server connected to a SAN 3510 Array.  On the host server, there are two volume groups set up--root_vg and san_vg.  I'm assuming that root_vg resides on the internal disks and san_vg on the SAN.  But, how can I check to make sure this is the case?
> >
> vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
> >read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> try with the pvs command
> 

Re: [linux-lvm] How do I tell what disk a volume group reside on

[Vickie Troy-McKoy]

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 Thank you; but I've tried that command.  It gives me the output below; however, I want to ensure that /dev/md10 [root_vg] resides on the internal disks.  How can I ensure that?
 
  
  PV         VG      Fmt  Attr PSize   PFree 
  /dev/dm-10 san_vg  lvm2 a-   299.99G     0 
  /dev/dm-9  san_vg  lvm2 a-   174.99G     0 
  /dev/md10  root_vg lvm2 a-    68.22G 12.44G

Regards,



 

> Date: Wed, 14 Apr 2010 07:21:51 +0200
> From: bluca@comedia.it
> To: linux-lvm@redhat.com
> Subject: Re: [linux-lvm] How do I tell what disk a volume group reside on
> 
> On Tue, Apr 13, 2010 at 08:59:40PM -0400, Vickie Troy-McKoy wrote:
> >
> >Hi All,
> >
> > 
> >
> >I have a RedHat4 server connected to a SAN 3510 Array. On the host server, there are two volume groups set up--root_vg and san_vg. I'm assuming that root_vg resides on the internal disks and san_vg on the SAN. But, how can I check to make sure this is the case?
> >
> vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
> >read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> try with the pvs command
> 
> -- 
> Luca Berra -- bluca@comedia.it
> Communication Media & Services S.r.l.
> /"\
> \ / ASCII RIBBON CAMPAIGN
> X AGAINST HTML MAIL
> / \
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
 		 	   		  
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Re: [linux-lvm] How do I tell what disk a volume group reside on

[Ray Morris]

> however, I want to ensure that /dev/md10 [root_vg] resides
> on the internal disks.  How can I ensure that?

   Note that this is no longer an LVM question, but a
softraid question, and when the softraid question is answered
it leads you to a SAN question.  Hat's because LVM doesn't
know or care where the md10 device is physically located, much
less know or care where any component devices are.

  To see which devices make up
/dev/md10, do:
cat /proc/mdstat

Output will look something like :

Personalities : [raid6] [raid5] [raid4]
md10 : active raid5 sda2[0] sdc2[2] sdb2[1]
       772370304 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]

unused devices: <none>

    The second line tells us that md10 is made up of these devices:
sda2[0] sdc2[2] sdb2[1]

    Now the question becomes are those devices internal?  If you
can't tell from the names, lsscsi might come in handy.  If it's
still not apparent, you have a SAN question that depends on the
type of SAN you have.  It's even possible to set up a SAS SAN with
internal and external storage attached to the same card.  If the
"identify" lights aren't hooked up, the only way to know for sure
would be to compare serial numbers with the output of sdparm!

    It may seem strange that it can be so "hard" to know what's
what, but that's exactly where the magic comes from - you can
make a RAID of external devices, internal devices, or a mix
precisely because the RAID system doesn't know or care where they
are physically located.
--
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On 04/14/2010 07:16:56 AM, Vickie Troy-McKoy wrote:
> 
> 
>  Thank you; but I've tried that command.  It gives me the output  
> below;
> however, I want to ensure that /dev/md10 [root_vg] resides on the  
> internal
>  disks.  How can I ensure that?
> 
> 
>   PV         VG      Fmt  Attr PSize   PFree
>   /dev/dm-10 san_vg  lvm2 a-   299.99G     0
>   /dev/dm-9  san_vg  lvm2 a-   174.99G     0
>   /dev/md10  root_vg lvm2 a-    68.22G 12.44G
> 
> Regards,

Re: [linux-lvm] How do I tell what disk a volume group reside on

[Ron Johnson]

On 2010-04-13 19:59, Vickie Troy-McKoy wrote:
> Hi All,
> 
> I have a RedHat4 server connected to a SAN 3510 Array.  On the
> host server, there are two volume groups set up--root_vg and
> san_vg.  I'm assuming that root_vg resides on the internal disks
> and san_vg on the SAN.  But, how can I check to make sure this is
> the case?
> 

This is what I get when I run pvscan.  pvs is similar.

# pvscan
   PV /dev/sda4   VG main_huge_vg   lvm2 [529.00 GiB / 0    free]
   PV /dev/sdb2   VG main_huge_vg   lvm2 [594.25 GiB / 0    free]
   PV /dev/sdc1   VG main_huge_vg   lvm2 [931.50 GiB / 0    free]
   PV /dev/sdd1   VG main_huge_vg   lvm2 [698.62 GiB / 0    free]
   PV /dev/sde1   VG main_huge_vg   lvm2 [931.50 GiB / 0    free]
   Total: 5 [3.60 TiB] / in use: 5 [3.60 TiB] / in no VG: 0 [0   ]

# pvs
   PV         VG           Fmt  Attr PSize   PFree
   /dev/sda4  main_huge_vg lvm2 a-   529.00g    0
   /dev/sdb2  main_huge_vg lvm2 a-   594.25g    0
   /dev/sdc1  main_huge_vg lvm2 a-   931.50g    0
   /dev/sdd1  main_huge_vg lvm2 a-   698.62g    0
   /dev/sde1  main_huge_vg lvm2 a-   931.50g    0


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