topic Re: Raw logical volume in Operating System - HP-UX

Raw logical volume

Suni Raj — Mon, 20 Mar 2006 09:28:00 GMT

Hi, I am new to hp-ux admin. Client want me to create a new raw logical volume and give ownership to sybase. Can any admin tell me what exactly I need to do(commands) to create a raw LV and giving ownership.

Thanks
Raj

Re: Raw logical volume

Pete Randall — Mon, 20 Mar 2006 09:31:47 GMT

You can either use SAM or LVM commands. The lvcreate command is used to create a logical volume. If you need to create space for your logical volume, you might have to create or extend a volume group with pvcreate/vgcreate or vgextend.

Once you've created the logical volume, you refer to the raw LV as /dev/vg__/rlvol_

Pete

Re: Raw logical volume

Suni Raj — Mon, 20 Mar 2006 09:36:32 GMT

Hi Pete, thanks a lot for ur help. Could you also pls tell me how i assign this raw device to sybase user. The user name is sybase and group is sybadm.

Regds
Suni

Re: Raw logical volume

Victor Fridyev — Mon, 20 Mar 2006 09:46:59 GMT

Hi,

In order to create a logical volume, run

lvcreate -L sizeMB -n lvolname /dev/vgname

In order to set ownership/permissions, run

chown sybase /dev/vgname/lvolname or
chown sybase /dev/vgname/rlvolname,

depending on the type of device, which is used (I guess, it's rlvolname).

By the same way you can change permissions, i.e
chmod 755 /dev/vgname/rlvolname

HTH

Re: Raw logical volume

Pete Randall — Mon, 20 Mar 2006 09:47:47 GMT

Not sure about Sybase, we're an Informix shop. You might have to "chown sybase:sybadm /dev/vg__/rlvol__". Instead, you might have to create a link to the raw logical device that is owned by sybase. You'll have to check with our DBA.

Pete

Re: Raw logical volume

Pete Randall — Mon, 20 Mar 2006 09:50:02 GMT

Sorry - make that "your DBA"

Pete

Re: Raw logical volume

Nguyen Anh Tien — Mon, 20 Mar 2006 20:59:32 GMT

raw divice means logical volume without defining fstype(vxfs, hfs...)
so you can create LV by
#lvcreate -L sizeinMB -n name /dev/vgxx
#chown user:group /dev/vgxx/rname
That's all.
HTH
tienna

Re: Raw logical volume

JASH_2 — Tue, 21 Mar 2006 04:35:03 GMT

I had great fun trying to organise a raw volume group for sybase. Simple enough to create raw file, I just used SAM. You then need to link the raw device to the databse filesystem that you are building for the sysbase installation.i.e.

ln -s /dev/vgxx/rlvoly /sybase/dbsys1

Regards,

JASH

Re: Raw logical volume

PAMvDam — Tue, 21 Mar 2006 11:40:21 GMT

Personally, I would't do the linking. Within Sybase your DBA has the possibility to use the raw logical volume filename for the database devices (disk init <...>).

Creating symlinks will increase the burden of System administration and most probably confuse others.

Best regards,

Pascal

Re: Raw logical volume

HGN — Tue, 21 Mar 2006 13:56:48 GMT

Hi

If you feel this issue is resolved,please close this and assign points since you have assigned points to only 11 out 52 posts

Rgds

HGN