topic Re: Using EMC Hard Disk in Operating System - HP-UX

Using EMC Hard Disk

zap_2 — Thu, 17 Mar 2005 08:02:54 GMT

Hi, unix gurus, if I create new mount point using EMC hard disk, how to define this mount point so it will be recognized as STD, Mirror, and BCV volume.Any explaination will be appreciated.Thanks in advance.

Re: Using EMC Hard Disk

harry d brown jr — Thu, 17 Mar 2005 08:15:52 GMT

You don't create a mount point using EMC disk(s) unless you are going to use RAW disk(s).

You either create a Volume Group (VG) with the EMC disk(s), or add the EMC disk(s) to an existing VG.

Mirroring and BCV's are done within the EMC box. Mirroring can be done using HPux but if you have the ability to do it within the EMC box, then you do it there. If you do not know how to do this, then I suggest you consult EMC.

live free or die
harry d brown jr

Re: Using EMC Hard Disk

Stuart Abramson — Thu, 17 Mar 2005 08:36:39 GMT

You create a mount point like this:

mkdir /mountpoint

You don't define what kind of EMC disk it is. You do that when you set up the EMC HyperVolumes.

(HyperVolume are what gets presented to your server HBA, turned in to PVs, built into VGs, and then you create LVs in the VG.)

Also, a single HyperVolume is either a STD or a BCV. It can't be more than one.

If you have 10 STD HVs, you can present them to a server and build 10 PVs on them and make a VG/LV/File System and mount it.

If you have BCV HVs and they are split mirrors of STD HVs you can vgimport them and mount them on a server (usually a different server from where the STDs are mounted).

Does that help? Is that what you meant?

Re: Using EMC Hard Disk

Geoff Wild — Thu, 17 Mar 2005 09:44:55 GMT

Standards are what you mount on a server (never the mirrors)...You SDR the Host to the FA's, and then Mask the LUNs (disks) you want. BCV's are for backup and DRP. You can mask the BCV's to your backup server - then when you want to back up your database - put it in hot mode, split the bcvs, then mount on the backup server.

Rgds...Geoff

Re: Using EMC Hard Disk

Rick Garland — Thu, 17 Mar 2005 11:09:45 GMT

The STD EMC disks are typically mirrored within the EMC (they don't have to be but I prefer it). You create BCVs within EMC to match the STDs.

The mountpoint is a HPUX deal.

Re: Using EMC Hard Disk

Mic V. — Thu, 17 Mar 2005 14:20:16 GMT

Zap -- you didn't mention what EMC software you have.

If you don't have ControlCenter or its various components that let you (the customer) change your EMC array, you will have to contact EMC to make the change. Your salesman or CE can help you.

By "change your EMC array" I'm assuming you mean a Symmetrix-class and that you want to set up the storage as described above (STD devices, M1 devices, BCVs).

HTH,
Mic

Re: Using EMC Hard Disk

zap_2 — Thu, 17 Mar 2005 20:58:40 GMT

Hi Stuart, I interest with your explanation.
From your explanation, I will reconfirm to you some questions following:
1.What the difference between metavolume and hypervolume?
2.The first step we must do define STD and BCV HVs before we attach them to HPUX VG/LV/FS?
3.One HV can consist of more than one hard disks ?

Re: Using EMC Hard Disk

zap_2 — Fri, 18 Mar 2005 02:01:36 GMT

hi, Stuart, if I have unmapped devices like : BCV Devices, BCV Metadevices, and STD devices, that means I just add those unmapped devices to mapped devices for purpose to define new STD and BCV devices.How do I know what HPUX device name associate with STD and BCV devices that I have add to mapped devices? You know that on EMC it recognizes such as DEV001 but on HPUX should recognized as /dev/rdsk/cxtxdx?Thanks in advance.

Re: Using EMC Hard Disk

harry d brown jr — Fri, 18 Mar 2005 06:56:40 GMT

1.What the difference between metavolume and hypervolume?

** A hypervolume is a portion of a disk. A Metavolume is a combination of hypervolumes.

2.The first step we must do define STD and BCV HVs before we attach them to HPUX VG/LV/FS?

** You don't attach BCV's to vg/lv/fs's until they are defined and split from the R1.

3.One HV can consist of more than one hard disks ? NO, but metavolumes do.

How do I know what HPUX device name associate with STD and BCV devices that I have add to mapped devices?

** by the device path - You need to match your emc device target/lun path to your HP.

live free or die
harry d brown jr

Re: Using EMC Hard Disk

Doug Kratky — Fri, 18 Mar 2005 11:14:42 GMT

Dowload the inq command from ftp://ftp.emc.com/pub/symm3000/hpux/ to your HP-UX system. Run that command on HP-UX and it will tell you how your EMC devices are mapped to HP-UX names.

(You might also want to get emcgrab at ftp://ftp.emc.com/pub/emcgrab/Unix/).

For background information on using EMC storage, get an account at powerlink.emc.com if you don't already have one. Go to Support and then to Document Library. Under Host Connectivity, you'll find a good reference for HP-UX. Under Hardware/Platforms you can learn more about EMC storage.

Doug

Re: Using EMC Hard Disk

itai weisman — Mon, 21 Mar 2005 13:14:40 GMT

after masking the devices (using ECC, ESN, or symmask command - if you're a begginer ECC is the most recommendeded) :
use ioscan to rescan IO buses:
#ioscan -fnCdisk
use insf to create special devices file
# insf -e
if you're using power path, make sure the new disks are visible by
#powermt display
use syminq command to see the new devices (there you can see wheter these devices are metas, hypers, bcv etc)
/usr/symcli/bin/syminq
then you can create vg/lvol/fs
hope that helps
itai

Re: Using EMC Hard Disk

Rita C Workman — Mon, 21 Mar 2005 13:41:40 GMT

Zap,

You are getting into a side of technology that should not be undertaken without training...first.

Mounting is one thing.
Mapping is another thing.
Lun Masking is still another.

Your questions tell me that you do not have the 'basic' knowledge you need before undertaking setting up disks.
Please Please Please take the first steps to help yourself and open a book and/or go to some kind of training class.
Because hit and miss answers that are going on above......if they are misunderstood and applied incorrectly, will be deadly to your data.

Kindest Regards,
Rita