topic Re: Filesystem Extending Queries. in Operating System - HP-UX

Filesystem Extending Queries.

kunjuttan — Fri, 04 Jun 2010 02:16:42 GMT

Hi Gurus,
I am having an Hp rx7640 server running hp-ux11.23 os.Existing Fs size is 50GB.I want to make it 100GB.
The problem is,I created and presented 100GB LUN to the particular host.but when I run the ioscan command it is showing 2 new devices.SO i am confused that in which disk I have to create the PV.I am giving the two new paths which is showing in the ioscan output.Pls help

disk 34 0/3/1/0.1.17.0.0.0.2 sdisk CLAIMED DEVICE HP HSV200
/dev/dsk/c18t0d2 /dev/rdsk/c18t0d2
disk 33 0/3/1/0.1.16.0.0.0.2 sdisk CLAIMED DEVICE HP HSV200
/dev/dsk/c16t0d2 /dev/rdsk/c16t0d2

Re: Filesystem Extending Queries.

Kapil Jha — Fri, 04 Jun 2010 02:23:52 GMT

These 2 disk are the same disk, you have 2 FC card and seocnd is the alternate link to the disk.
/dev/dsk/c18t0d2
/dev/dsk/c16t0d2

t0d2 is one disk.

If you want to be sure check serial number from cstm, if its EMC LUN check powermt or inq unitilty.

You can do pvcreate on any of the LUNs don do it on both it would be the same thing.

Its just one lun with 2 name.

BR,
Kapil+

Re: Filesystem Extending Queries.

kunjuttan — Fri, 04 Jun 2010 02:34:51 GMT

Thanx.
I am having HP-EVA 8400 storage.

Re: Filesystem Extending Queries.

kunjuttan — Fri, 04 Jun 2010 02:36:30 GMT

And also I am having only one FC card,but two ports.

Re: Filesystem Extending Queries.

SoorajCleris — Fri, 04 Jun 2010 02:44:49 GMT

Hi ,

Do pvcreate on one device, then extend the VG with both path. Thats it.

Regards,
Sooraj

Re: Filesystem Extending Queries.

kunjuttan — Fri, 04 Jun 2010 02:52:28 GMT

But how can I give that Sooraj.If I am having 2 FC cards it will show four devices and I have to give all these four paths while extending VG??If I use single device what will happen??

Re: Filesystem Extending Queries.

Kapil Jha — Fri, 04 Jun 2010 02:59:19 GMT

4 paths??

Well see you do pvcreate on a disk, does not matter if you use name c18t0d2 or c16t0d2 it would be same thing.

When u extend VG with alternate path it would show as alternate path in vgdisplay -v
even if u have 8 alternate paths you can go ahead and extend the VG with all the devices.

BR,
Kapil+

Re: Filesystem Extending Queries.

kunjuttan — Fri, 04 Jun 2010 03:12:15 GMT

If I use single device with vgextend what will happen??

Re: Filesystem Extending Queries.

kunjuttan — Fri, 04 Jun 2010 04:25:34 GMT

please help..

Re: Filesystem Extending Queries.

Kapil Jha — Fri, 04 Jun 2010 04:37:42 GMT

If you use single device with vgextend nothing would happen :)

if that path or FC goes down your VG would not be accessible.

And if you add other paths as well with vgextend nothing would happen :)

except if your one FC card failes your VG would still be active with other FC card and you would be more happy.

BR,
Kapil+

Re: Filesystem Extending Queries.

Torsten. — Fri, 04 Jun 2010 04:42:36 GMT

Unless you are using autopath/securepath you should vgextend the alternate links.

You can get details about the vdisks using the "evainfo" utility (from web).

Re: Filesystem Extending Queries.

Torsten. — Fri, 04 Jun 2010 04:43:35 GMT

... but check it again!

HSV200 is *NOT* an EVA 8400!

Re: Filesystem Extending Queries.

Prasanth V Aravind — Fri, 04 Jun 2010 04:46:24 GMT

you can add one device to vg & extend filesystem. But remember that you are accessing the lun through single path. there won't be any redundancy.

so always recommended to add the second path also to the vg, which os automatically detect as pvlink.

it seems you have hp eva storage, install evainfo software in your hp box though which you can easily identify newly added luns.

Gudlcuk
Prasanth

Re: Filesystem Extending Queries.

Torsten. — Fri, 04 Jun 2010 04:49:46 GMT

With an EVA 8x00 I would expect up to 8 pathes to each vdisk ...

Re: Filesystem Extending Queries.

kunjuttan — Fri, 04 Jun 2010 04:53:16 GMT

So what will be the command?Is the following?what about pvcreate .Is it not necessory to uase all the paths??pls help.its very critical.Thats what i am asking for each and every thing.

#pvcreate /dev/rdsk/cxtxdx

Extend the existing VG,
#vgextend vgsapdata1 /dev/dsk/cxtxdx /dev/dsk/cxtxdx /dev/dsk/cxtxdx /dev/dsk/cxtxdx

Re: Filesystem Extending Queries.

Kapil Jha — Fri, 04 Jun 2010 05:12:41 GMT

Yups thats the thing you can do it with out worrying.
If you further wants to check, you can always reduce the other paths.
right now I suppose with whatever you have provided best thing is to extend VG with all links.
And which storage is that do u have powermt securepath autopath

BR,
Kapil+

Re: Filesystem Extending Queries.

Torsten. — Fri, 04 Jun 2010 05:20:03 GMT

Do pvcreate only once, then add (vgextend) all the alternate pathes.

Re: Filesystem Extending Queries.

kunjuttan — Fri, 04 Jun 2010 05:24:52 GMT

#vgextend vgsapdata1 /dev/dsk/cxtxdx /dev/dsk/cxtxdx /dev/dsk/cxtxdx /dev/dsk/cxtxdx

above command is to be used.isnt it??

Re: Filesystem Extending Queries.

kunjuttan — Fri, 04 Jun 2010 05:44:28 GMT

pls confirm,so that i can go ahead..

Re: Filesystem Extending Queries.

Torsten. — Fri, 04 Jun 2010 05:48:23 GMT

It will work that way.
Please think about the order of pathes, consider to use the second path on the second HBA, etc ...