<Resend-- since my mailserver used wrong 'reply-to' when I subscribed--sorry for the repeat>

 

I have been studying the documentation and searching the lists, but I can't seen to find an answer to my particular issue.

 

My situation is this:

I have 2 identical Gentoo boxes running "vanilla" 2.4 kernels. They are older boxes that we given to me for Linux testing (PII 400Mhz, 4G IDE HD) One is a production server serving up Samba shares and Apache. I intend the other box to be a mirror-failover. In the meantime I secured another older box (PII 300Mhz, 4G SCSI HD) to use in order to test clustering without jeopardizing my production box.

DS2 = hda3 is root partition (reiserfs), which I want mirrored to DS3

DS3 = sda3 is root partition (reiserfs), which will be the mirror of DS2

 

I have done an rsync of the production server (called DS) to it's backup (called DS2). I have also rsync'ed that to the cluster experiment box (called DS3). DS2 and DS3 are connected to the main net through eth0 (10/100Mbit) and a crossover cable on eth1 (10/100Mbit). I have installed heartbeat on DS2 and DS3 and tested the failover and it works. I have installed DRBD on DS2 and DS3 and I believe the configuration is correct.

 

listing drbd.conf:

resource drbd0 {
  protocol = C
  fsckcmd = /bin/true

 

  disk {
    do-panic
    disk-size = 3662700
  }

 

  net {
    sndbuf-size = 1M
    sync-min    = 500k
    sync-max    = 100M  # maximal average syncer bandwidth, default was 1M
    tl-size     = 5000  # transfer log size, ensures strict write ordering
    timeout     = 60    # unit: 0.1 seconds
    connect-int = 10    # unit: seconds
    ping-int    = 10    # unit: seconds
    ko-count    = 4     # if some block send times out this many times,
                        # the peer is considered dead, even if it still
                        # answeres ping requests
  }

 

  on ds2 {
    device = /dev/nb0
    disk = /dev/hda3
    address = 10.0.0.1
    port = 7788
  }

 

  on ds3 {
    device = /dev/nb0
    disk = /dev/sda3
    address = 10.0.0.2
    port = 7788
  }
}

I am now ready to test my cluster, but I am not fully understanding how DRBD works with existing file systems. What must I do to create the mirror/failover between the two? Should I be trying to mirroring my entire root partition? I am worried that I will have problems since DS3 is SCSI and DS2 is IDE. Even though these are "test" boxes, I want to get it right the first time if possible.

 

Thanks.