DRBD - Check Status

Run sudo cat /proc/drbd to retrieve the DRBD service status

How unhealthy looks like:

version: 8.4.5 (api:1/proto:86-101)
srcversion: 611D9EEFB9C11D2BC709D07
 0: cs:WFConnection ro:Primary/Unknown ds:UpToDate/DUnknown C r-----
    ns:0 nr:1408 dw:1816 dr:57681 al:4 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:404

How synching looks like:

[email protected]:/# sudo cat /proc/drbd
version: 8.4.5 (api:1/proto:86-101)
srcversion: 611D9EEFB9C11D2BC709D07
 0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r-----
    ns:28 nr:1408 dw:2040 dr:57717 al:6 bm:0 lo:0 pe:1 ua:0 ap:0 ep:1 wo:f oos:572
        [===================>] sync'ed:100.0% (572/592)K
        finish: 0:00:01 speed: 20 (20) K/sec

How healthy looks like:

[email protected]:/# sudo cat /proc/drbd
version: 8.4.5 (api:1/proto:86-101)
srcversion: 611D9EEFB9C11D2BC709D07
 0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
    ns:592 nr:1408 dw:2040 dr:58281 al:6 bm:0 lo:3 pe:0 ua:0 ap:0 ep:1 wo:f oos:0