DRBD

Простой конфиг

global {
  usage-count no;
}

common {
    protocol C;
}

resource r0 {
    on sirmax {
        device    /dev/drbd1;
        disk      /dev/sda7;
        address   10.1.1.31:7789;
        meta-disk internal;
    }


    on nightmare {
        device    /dev/drbd1;
        disk      /dev/sda7;
        address   10.1.1.32:7789;
        meta-disk internal;
    }
}

1. modprobe drbd
2. drbdadm create-md drbd0

drbdadm create-md r0 md_offset 41883086848 al_offset 41883054080 bm_offset 41881772032

Found some data

==> This might destroy existing data! <==

Do you want to proceed? [need to type 'yes' to confirm] yes

Writing meta data... initializing activity log NOT initialized bitmap New drbd meta data block successfully created.

1. drbdadm attach drbd0
2. drbdadm connect drbd0

dmesg
[86352.936619] drbd1: disk( Diskless -> Attaching )
[86352.936625] drbd1: Starting worker thread (from cqueue [20959])
[86352.937639] drbd1: No usable activity log found.
[86352.937644] drbd1: max_segment_size ( = BIO size ) = 32768
[86352.937648] drbd1: drbd_bm_resize called with capacity == 81800336
[86352.938477] drbd1: resync bitmap: bits=10225042 words=159767
[86352.938482] drbd1: size = 39 GB (40900168 KB)
[86352.938494] drbd1: Writing the whole bitmap, size changed
[86352.977094] drbd1: 39 GB (10225042 bits) marked out-of-sync by on disk bit-map.
[86353.006166] drbd1: recounting of set bits took additional 1 jiffies
[86353.006171] drbd1: 39 GB (10225042 bits) marked out-of-sync by on disk bit-map.
[86353.006178] drbd1: disk( Attaching -> Inconsistent )
[86381.994378] drbd1: conn( StandAlone -> Unconnected )
[86381.994398] drbd1: Starting receiver thread (from drbd1_worker [21012])
[86381.994459] drbd1: receiver (re)started
[86381.994469] drbd1: conn( Unconnected -> WFConnection )

Ссылки

http://www.netup.ru/articles.php?n=13
http://habrahabr.ru/blogs/hi/50143/