Hard disk requirement is either fast HDD or SDD, can you please explain?

[asurajpai]

Hi,

From the install guide the hard disk requirement is fast HDD / SDD for some components like Cassandra, Analytic, could you please explain why?

If the instances are deployed in cloud, it would be a volume mount added to the instances, is it recommended?

Can we use NFS to mount to the instances by partition?

Please give all the possible options for us to use the voulme mounts that will be supported.

BR, Suraj

[asurajpai]

Can Apigee be installed on a drive by creating a symbolic link for Eg.

a symbolic link "/apigee" pointing to "/usr/local/apigee"

Can we maintain the data folders to a symbolic link for Eg.

a symbolic from "/apigee/apigee4/data" to "/apigeedata"

all installation will be under /apigee.

[gagan]

Hi @asurajpai, I have posted the symlink question as a separate one here

[asurajpai]

@jagjyot , @Mukundha Madhavan Can you please help.

[bkrishnankutty]

Its NOT recommended to have Network storage for High TPS capable Databases like Cassandra. Cassandra works on a shared nothing architecture. Any network storage would introduce additional latencies.

http://docs.datastax.com/en/cassandra/2.0/cassandra/architecture/architecturePlanningHardware_c.html

Fast HDD or SSD is recommended depending on the latency tolerance for the use case, Good SSD drives will help improve latencies at cassandra level.

[bkrishnankutty]

Network Storage can be used for Cassandra, provided**

1. Use Local SSD drive for commitlogs
2. Use Network SSD/Flash with dedicated network interface for Cassandra node, for data directory which will guarantee 10,000 IOPS or more.

**This is a very huge ask in a private cloud.