One secret that nobody will not tell you for a cluster of two nodes
GFS Cluster is good thing. It simple and robust: If first node down, secondary replace it.
But… Did you know about GFS work? It write all data beetween servers via network connection. Usually servers connect via 1Gbps – it is 128Mb per second. Sounds good? Please hold on! This is a RAW bandwith. TCP/IP connection take 5%. GFS take 10%.
Well, 100mb per second sound good, but one second! GFS is a beedirectional protocol such like DRBD. So, it split channel twiced – 50mb per second.
And now check – did you MySQL will work nice for that drive speed? Of course Not!
But we have uniqe techniqe for solution this problem: Use secondary node as dedicated network block device. It avoid spliting channel and you got full 100mb per second.
Sounds good, yea?
[si-contact-form form='2']
Popularity: 3% [?]
