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Dell Compellent Confidential HP-UX Best Practices 11i v2 and 11i v1

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From this output above, we would want to identify the most optimized set of parameters based upon

approximated LUN sizes, which would be added to this Volume Group. Since the initial LUN was 30GB

in size (and since expanded to 50GB on the Dell Compellent Storage Center), and with the assumption

that subsequent LUNs will max out around 250GB, we will use the parameter set identified in RED

above. This parameter set will reconfigure the Volume Group to accommodate a maximum of 8 PVs

(Physical Volumes i.e. LUNs) with each LUN having 16380 PEs (Physical Extents) of 16MB (PE Size) each.

We would preview this parameter set with the command below.

Type: vgmodify -r -p 8 -e 16380 vgdemo

Current Volume Group settings:

Max LV 255

Max PV 16

Max PE per PV 1919

PE Size (Mbytes) 16

VGRA Size (Kbytes) 304

The current and new Volume Group parameters differ.

An update to the Volume Group IS required

New Volume Group settings:

Max LV 255

Max PV 8

Max PE per PV 16380

PE Size (Mbytes) 16

VGRA Size (Kbytes) 1088

Review complete. Volume group not modified

To effect this change, we would first need to OFFLINE (inactive) the Volume Group, issue the

command.

Type: vgchange –a n vgdemo

Volume group "vgdemo" has been successfully changed.

We would then issue the “vgmodify” command from above. We would run it this time without the “–r”

(ie. preview) parameter.

Type: vgmodify -p 8 -e 16380 vgdemo

Current Volume Group settings:

Max LV 255

Max PV 16

Max PE per PV 1919

PE Size (Mbytes) 16

VGRA Size (Kbytes) 304

The current and new Volume Group parameters differ.

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Seagate ST318404LC Guida Utente Pagina 24