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DPOD is I/O intensive, as it needs to persist all logs and information at very high rates. Therefore, for most of the installations, it needs to be configured with very fast disks, and with at least 3 separate disks (OS, app/logs, data).
Some configurations, such as the Cell environment, require additional data disks.
Usage of slow disks will impact the maximum TPS that DPOD can process, the performance of queries and the amount of time between the creation of transaction logs and the availability of the data on DPOD's dashboards.
For each 1 TB of data 64 GB of RAM is recommended for responsive queries (dashboards and filters).
NFS is not supported for the data disk, as the Store relies on file system behavior that NFS does not supply. Data corruption and other problems can occur.
Software RAID (such as CentOS RHEL built-in software RAID) is not supported.
The data disk retention is automatically managed by DPOD. For each type of data (transactional, resources, payload, etc.), once its quota is full, old data will be discarded to make room for new data of the same type. A bigger disk size will hold a longer history.
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