Two Node Cluster Storage
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This is a collection of ASCII images showing storage in clusters.
Two Node
These are storage maps used in two-node clusters.
Clustered LVM On DRBD Backed By Direct Drive Storage
an-node01
______ ______ ______ __[sda4]__
| sda1 | | sda2 | | sda3 | | ______ | _______ ______________ ______________________________
|______| |______| |______| | | sda5 |-+------| drbd0 |--| drbd_sh0_vg0 |--| /dev/drbd_sh0_vg0/xen_shared |
| | | | |______| | /--|_______| |______________| |______________________________|
___|___ _|_ ____|____ | ______ | | _______ ______________ ____________________________
| /boot | | / | | <swap> | | | sda6 |-+---+----| drbd1 |--| drbd_an1_vg0 |--| /dev/drbd_an1_vg0/vm0001_1 |
|_______| |___| |_________| | |______| | | /--|_______| |______________| |____________________________|
| ______ | | | _______ ______________ ____________________________
| | sda7 |-+---+-+----| drbd2 |--| drbd_an2_vg0 |--| /dev/drbd_an1_vg0/vm0002_1 |
| |______| | | | /--|_______| |______________| |____________________________|
| ______ | | | | | | _______________________
| | sda8 |-+---+-+-+--\ | \---| Example LV for 2nd VM |
| |______| | | | | | | |_______________________|
|__________| | | | | | _______________________
an-node02 | | | | \-----| Example LV for 3rd VM |
______ ______ ______ __[sda4]__ | | | | |_______________________|
| sda1 | | sda2 | | sda3 | | ______ | | | | |
|______| |______| |______| | | sda5 |-+---/ | | | _______ __________________
| | | | |______| | | | \--| drbd3 |--| Spare PV for |
___|___ _|_ ____|____ | ______ | | | /--|_______| | future expansion |
| /boot | | / | | <swap> | | | sda6 |-+-----/ | | |__________________|
|_______| |___| |_________| | |______| | | |
| ______ | | |
| | sda7 |-+-------/ |
| |______| | |
| ______ | |
| | sda8 |-+----------/
| |______| |
|__________|
Clustered LVM On DRBD Backed By RAID Level 1 Storage
Below is an ASCII drawing which should help you see how DRBD will tie in to the rest of the cluster's storage. This map assumes a simple RAID level 1 array underlying each node. If your node has a single hard drive, simply collapse the first two layers into one. Similarly, if your underlying storage is a more complex RAID array, simply expand the number of physical devices at the top level.
Node1 Node2
_____ _____ _____ _____
| sda | | sdb | | sda | | sdb |
|_____| |_____| |_____| |_____|
|_______| |_______|
_______ ____|___ _______ _______ ____|___ _______
__|__ __|__ __|__ __|__ __|__ __|__ __|__ __|__
| md0 | | md1 | | md2 | | md3 | | md3 | | md2 | | md1 | | md0 |
|_____| |_____| |_____| |_____| |_____| |_____| |_____| |_____|
| | | | | | | |
___|___ _|_ ____|____ |___________| ____|____ _|_ ___|___
| /boot | | / | | <swap> | | | <swap> | | / | | /boot |
|_______| |___| |_________| ______|______ |_________| |___| |_______|
| /dev/drbd0 |
|_____________|
|
____|______
| clvm PV |
|___________|
|
_____|_____
| drbd0_vg0 |
|___________|
|
_____|_____ ___...____
| | |
___|___ ___|___ ___|___
| lv_X | | lv_Y | | lv_N |
|_______| |_______| |_______|
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