Hi All,
Can anyone please clarify what's the actual volume size limit for DRBD? The
linbit's article dated 2012 says the current maximum is 1PiB, but when I'm
trying to create a 3 node replication with 527TiB each, it gets me to the
bitmap size error.
I have an assumption that overall bitmap size limit is divided for 2 replicas.
Is there any technical reason behind it? Is there any other way to create this
volume without splitting it up and joining by LVM on the top (LVM-> DRBD ->
LVM)?
# drbdadm create-md r0
Error: Bitmap for that device got too large.Command 'drbdmeta 0 v09
/dev/storage/data internal create-md 2' terminated with exit code 10
# drbdadm dump all
# /etc/drbd.conf
global {
usage-count no;
}
common {
options {
auto-promote yes;
}
net {
protocol C;
max-buffers 8K;
}
disk {
disk-barrier no;
disk-flushes no;
md-flushes no;
disk-drain yes;
resync-rate 2G;
c-plan-ahead 0;
}
}
# resource r0 on sgpplhan01: not ignored, not stacked
# defined at /etc/drbd.d/r0.res:1
resource r0 {
volume 0 {
device /dev/drbd0 minor 0;
disk /dev/storage/data;
meta-disk internal;
}
on node01 {
node-id 1;
address ipv4 172.16.1.1:7788;
}
on node02 {
node-id 2;
address ipv4 172.16.2.1:7788;
}
on node03 {
node-id 3;
address ipv4 172.16.3.1:7788;
}
connection {
host node01 address ipv4 172.16.1.1:7788;
host node02 address ipv4 172.16.2.2:7788;
}
connection {
host node01 address ipv4 172.16.1.2:7788;
host node03 address ipv4 172.16.3.1:7788;
}
connection {
host node02 address ipv4 172.16.2.1:7788;
host node03 address ipv4 172.16.3.2:7788;
}
}
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 109.2T 0 disk
└─storage-data 253:3 0 527.6T 0 lvm
sdb 8:16 0 109.2T 0 disk
└─storage-data 253:3 0 527.6T 0 lvm
sdc 8:32 0 109.2T 0 disk
└─storage-data 253:3 0 527.6T 0 lvm
sdd 8:48 0 109.2T 0 disk
└─storage-data 253:3 0 527.6T 0 lvm
sdf 8:80 0 953.9G 0 disk
├─sdf1 8:81 0 200M 0 part /boot/efi
├─sdf2 8:82 0 1G 0 part /boot
└─sdf3 8:83 0 952.7G 0 part
├─centos-root 253:0 0 50G 0 lvm /
├─centos-swap 253:1 0 31.3G 0 lvm [SWAP]
└─centos-home 253:2 0 871.3G 0 lvm /home
sdg 8:96 0 91T 0 disk
└─storage-data 253:3 0 527.6T 0 lvm
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