Chad Sine wrote:
DRBD Users,
I'm setting up 2 CentOS 5.4 x86_64 servers to use DRBD. I set them up
to do RAID1, but /dev/drbd0 only shows up at 12GB instead of the 1.8
TB that the underlying devices have.
Both boxes are configured just like this, with 1800GB for /dev/sda4
[r...@centos54 etc]# parted
GNU Parted 1.8.1
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: Dell VIRTUAL DISK (scsi)
Disk /dev/sda: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 32.3kB 206MB 206MB primary ext3 boot
2 206MB 108GB 107GB primary ext3
3 108GB 120GB 12.8GB primary ext3
4 120GB 1920GB 1800GB primary
Here is the /etc/drbd.conf used on each
global { usage-count no; }
common { syncer { rate 1000M; } }
resource drbd-data {
protocol C;
startup {
wfc-timeout 15;
degr-wfc-timeout 60;
become-primary-on centos54;
}
# disk {
# size 1700G;
# }
net {
cram-hmac-alg sha1;
shared-secret "myP4$$";
}
on centos54 {
device /dev/drbd0;
disk /dev/sda3;
address 10.0.0.1:7787 <http://10.0.0.1:7787>;
meta-disk internal;
}
on centos54_2 {
device /dev/drbd0;
disk /dev/sda3;
address 10.0.0.2:7787 <http://10.0.0.2:7787>;
meta-disk internal;
}
}
From there, I ran the following command to create the md on each box
# drbdadm create-md drbd-data
Then I ran the following command on the primary system
# drbdadm -- --overwrite-data-of-peer primary drbd-data
Everything looks to synchronize with UpToDate for each device and
centos54 is primary.
However, now if I run parted on /dev/drbd0, it is only 12 GB, instead
of 1.8TB. I tried doing the following, but I still only get a 12GB
partition
# mkfs.ext3 /dev/drbd0
# mount /dev/drbd0 /media
What can I do to get the full 1.8 TB of mirrored storage?
Unfortunately, I don't have the output of the last few commands
available, sine the server is in use at the moment. I'll be able to
test and give proper output this weekend, when I swap out hard drives
and attempt this transition again.
according to the output of parted, sda3 is 12.8GB in size and, what do
ya know, you told drbd to use /dev/sda3 for the disk of the drbd-data
resource. so it did exactly what you told it. if you want to use the
1.8TB, change drbd to use sda4.
mike
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