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What kind of read and write speeds should I be seeing on the 5big network 2? I have raid 5 over 5 disks, v18.2. I'm seeing about 15MB/s write and 30MB/s read. Is that typical? If not what should I look at?

It depends on file size, smb protocol and if other activities are running on the device such as media servers building a database. Copy many small files will be slower as well because of file headers to be written

We recently added samba 4.9.4 that supports smb2 and 3 proticol. This improves speed as well.
On my 5big5 I reach for big files (> 100MB) and samba 4.9.4 writing speed of 30 MB/s and read 45 MB/s. On samba 3.0.37 this drops to 20 and 30 MB/s.

Thanks I'm getting 20MB/s write and about 50MB/s read, which is a lot better than before.