Concurrent Storage Question

From: Shekhar Dhotre (Shekhar.Dhotre_at_LENDLEASEREI.COM)
Date: 06/24/03

  • Next message: SSU_Support_at_MESINIAGA.COM.MY: "Sendmail 8.12.9" 
    Date:         Mon, 23 Jun 2003 20:13:16 -0700
To: aix-l@Princeton.EDU

    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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