Sizing Tool
QuantaStor 5 - SAN/NAS Storage Solution Designer
Server/Cluster Specification
Log devices boost write performance by committing a copy of all data writes to fast NVMe/SSD storage first which enables the system flush data out to HDD devices asynchronously and more efficiently in larger blocks.
Read cache devices act as an SSD extension of the RAM based read cache. Usually the RAM based read cache is sufficient but some use cases like video playback can greatly benefit from the additional read cache capacity.
Our general recommendation is to have a 1:1 ratio where a GB of RAM is added to the server for each TB of usable capacity. For most backup and archive configurations the required RAM requirements are lower and a reduced ratio may be used.
Storage Configuration
Compression % indicates the amount of additional usable capacity is gained due to data compression. If the data is pre-compressed such as images, video or pre-encrypted files set this to 0%.
Reserved free-space (overhead) indicates the amount of space that will not be used in order to avoid performance degradation. Large archive configurations which are generally write-once-read-many can set this to a low value like 5%. Database and server/desktop virtualization storage should set this to a higher value like 20%.
License Summary
IBM Cloud - QuantaStor Cloud Edition License(s)
Rack Summary
Solution Summary
Data Devices (per server)
Write Log Devices (per server)
Read Cache Devices (per server)
Usable Capacity
Usable w/ Compression
Raw Capacity
Pool Count
Pool Capacity(Usable)
Pool Capacity(Raw)
Estimated Monthly Cost
Price/GB/mo (5yr basis)
Server Specification