CODEWITHSUNDEEP
ionfs
Gili Nachum
Gili Nachum

Reputation: 5568

What is the typical access time for reading a 500KB file over a LAN from an NFS v4 server

Would it be right to compute it as the network time (2ms) + disk seek and block read (10ms) ~= 12ms? Would that be the correct order of magnitude?

Notes:
- Using Java.
- Note that I'm interested in the response time, not absolute rate.
- Assume mid-range hardware with no caching in place (access pattern is too random for caching to be effective).

Upvotes: 0

Views: 185

Answers (1)

Marki555
Marki555

Reputation: 6860

Generally speaking, yes.

Without any caching (NFS client cache, server disk cache, disk array cache, SSD), the time to fetch the data from physical disks will be magnitudes bigger than any network latencies (we are talking about local 1 Gbit LAN, which should have <1 ms latency on average). NFS has also read-ahead, so even reading data in small blocks should not affect the latency much.

Upvotes: 1

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