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Playback stalls on Network Drives
When we run Resolve on a Facilis Terrablock with Multwrite drives (appears as network drives like Unity or ISIS), we get a stall at each new shot on playback. If we struggle through a few times, it seems to cache somehow and then will play without hiccuping.
The same volume mounted as a single write drive (appears as direct attached storage) has no issues.
Bandwidth tests show no issues either.
I have talked to another house who had similar issues with renders stalling on ISIS.
Is there a trick to using a network shared drive with Resolve?
Terence Curren
http://www.alphadogs.tv
http://www.digitalservicestation.com
Burbank,Ca -
25 Replies
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Sounds like network latency. How are you connected to the network on the client systems and at the server?
Eric-ADK
Tech Manager -
4 Gig Fibre on both sides.
Terence Curren
http://www.alphadogs.tv
http://www.digitalservicestation.com
Burbank,Ca -
what are the source codecs and resolutions?
Eric Hansen
Production Workflow Designer / Consultant / Colorist / DIT
https://www.erichansen.tv -
DNxHD 175 23.98 1080Psf.
Not a very demanding stream. Again, the exact same volume mounted as a “single-write” drive (meaning it appears as a regular volume not a network shared drive) works fine. So that leads me to believe it’s not bandwidth issues. I was wondering if Resolve treats a network mounted volume differently than a direct attached volume.
Terence Curren
http://www.alphadogs.tv
http://www.digitalservicestation.com
Burbank,Ca -
I haven’t had issues over unmanaged ethernet SAN. i wonder if its a permissions issue since it sounds like you’re switching between locked and unlocked volumes. Maybe Resolve has an issue with Read-Only media (which seems really strange to me). Are you writing DNX back to the volume, or something more metadata intensive like DPX? Might want to repost over in SAN networks and see if Jim from Facilis has any answers.
e
Eric Hansen
Production Workflow Designer / Consultant / Colorist / DIT
https://www.erichansen.tv -
The Network drivers and OS treat the data differently between network volumes and Direct Attached volumes. There are several differences which mostly revolve around latency. Latency and throughput are different. You can have a network that pushes a 1GB/s a sec however if the latency is to high the playback will still interrupt. If you have software layers for file writing that allow multiple access then that will also add latency to the data stream. Davinci ram previews so when you first hit play Davinci’s player is building buffers into the ram. Once the buffers are built then the preview will be seemless because the network latency is no longer involved. The Data is local. That is why it stops at each clip when you first start playback and then will play fine the next time.
Eric-ADK
Tech Manager -
I agree with Eric, this is a latency issue and is due to the way the OS is handling the network share. Some program will realize a file system is not direct attached and preread the a clip ahead so as to avoid dropping frames due to latency. Resolve definitely prefers direct attached media.
color/post/workflow
https://JuanSalvo.com -
Well, this seems to match what our tests are showing. We have been running several other apps for years on the MultiWrite (network attached) Terrablock volumes for years with now issues.
I just wonder what Resolve is doing differently?
Terence Curren
http://www.alphadogs.tv
http://www.digitalservicestation.com
Burbank,Ca -
I disagree with my esteemed colleagues
While latency is an issue with the 1gbe systems used by mr Hanson, mr boden,mr salvo, and myself,
You are using a facilis with 4g atto fc41es fibre cards in server and client, connected to a qlogic switch.
You are trying to play a single 20MB/sec stream on a system that can do 200MB/sec per client.
IMHO you do not have a latency issue.
Facilis needs to download resolve lite and do a simple import and playback of a DNX file. The download is free for them. This is local to resolve. You won’t get help from BMD on this.Bob Zelin
Bob Zelin
Rescue 1, Inc.
maxavid@cfl.rr.com -
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