FORUMS: list search recent posts

Raid transfer speed inquiry

COW Forums : RAID Set-Up

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
Anhtu Vu
Raid transfer speed inquiry
on May 11, 2019 at 3:06:03 pm

On my Z840, i have an internal 3 disks raid 0 (speed = 350MB/s) and external SAS Raid 0 (550 MB/s). The Atto SAS card is on a PCIe x 16 slot.

When i transfer large files (800 GB), the transfer speed is roughly 160 MB/s and the system says it will take roughly 1 hour. This seems slow considering the speed of my Raids. Any idea why ?

Midway into the transfer, the transfer slows down and system shows 5 hours til completion before returning to previous speed with 55 min til completion message...any idea why ?

thx


Return to posts index

Rainer Wirth
Re: Raid transfer speed inquiry
on May 14, 2019 at 12:36:03 pm

Hi Anhtu,

you can test write, read speed with Aja speed test.
Surprisingly you work with Raid 0, which is a bit harakiri.
If one disk fails you end up with a total data loss.
For video editing the read speed is always higher than the write speed.
If your SAS system is nearly full the speed goes down on a significant level.
The PCIx Slot is not your bottleneck. Even with x8 you should get more data speed out of your SAS system.
It should be around 700 MB per second.

This should answer your question.

cheers

Rainer

factstory
Rainer Wirth
phone_0049-177-2156086
Mac pro 8core
Adobe,FCP,Avid
several raid systems


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2019 CreativeCOW.net All Rights Reserved
[TOP]