Re: Concurrent Storage Question

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Date:         Tue, 24 Jun 2003 08:49:01 -0500
To: aix-l@Princeton.EDU

We use an application called Polyserve.

http://www.polyserve.com/

You can contact me of you need further information.

Rod Jenkins
UNIX Administrator
Iowa Telecom
IBM Certified Specialist: pSeries AIX System Administration

-----Original Message-----
From: Shekhar Dhotre [mailto:Shekhar.Dhotre@LENDLEASEREI.COM]
Sent: Monday, June 23, 2003 10:13 PM
To: aix-l@Princeton.EDU
Subject: Concurrent Storage Question

Hi All,

This is slightly off topic question so please bear up with me . I am working
on proof of concept project (Oracle9i RAC on redhat Enterprise Linux) and
need some help in understanding concurrent access.
I have a shared SAN storage allocated to two linux servers (server A and
B) Everything works fine except these servers cannot use shared storage at
the same time. If I mount partions /file systems on server A, server B
can’t use it but If I halt server A and reboot server B then it becomes
available to server B. Oracle9i RAC requires concurrent access to SAN
storage, i.e. serverA and serverB need concurrent access to San storage .
Does anyone know in general how to configure concurrent storage? How do we
configure storage for HACMP (concurrent)? The storage is allocated from
SAN as a shared storage ,is there any kind of SCSI lock in Linux ?

       Two linux nodes Lq204 and LQ205 connected to MSA8000.
                
                On LQ204
                
                [root@usatl01lq204 root]# fdisk -l

                Disk /dev/sda: 255 heads, 63 sectors, 17702 cylinders

                Units = cylinders of 16065 * 512 bytes

                   Device Boot Start End Blocks Id System

                /dev/sda1 1 4462 35840983+ 83 Linux

                /dev/sda2 4463 8924 35841015 83 Linux

                /dev/sda3 8925 14024 40965750 83 Linux

                /dev/sda4 14025 17702 29543535 83 Linux

                
                On node Lq205 :
                
                
                [root@usatl01lq205 c01]# fdisk -l
                                                        
                Unable to read /dev/sda
                
                
                but on LQ205 the partions are available : (sda1,2,34 ) but
it says unable to read .
                
                [root@usatl01lq205 proc]# cat partitions

                major minor #blocks name rio rmerge rsect ruse wio
wmerge wsect wuse runni
                ng use aveq

                  142194517 sda 33438 1170455 1203968 270600 32925 431
33356 9810 0 27
 

                   35840983 sda1 11032 387219 398263 90240 10951 0 10951
3380 0 93600
 

                   35841015 sda2 11377 398094 409483 89100 11042 431 11473
4140 0 9320
 

                  40965750 sda3 10996 385136 396144 91230 10932 0 10932
2290 0 93500
 

                   29543535 sda4 14 0 28 30 0 0 0 0 0 30 30

Thanks in advance
SD

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