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Slow sync data rate

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Slow sync data rate

Postby happymeal » Thu Feb 27, 2020 11:53 am

Morning!

So this weekend I've tried to setup a 2-node Cluster on-site, using Starwind VSAN, in Server 2016 Datacenter.
I've created a HA Device between my two nodes which is 5.5TB (I'm using it to host several VM storage), and once the device is created, the sync is...slow. The most I've seen it top was 56KBps.

My Servers are HP DL380 G9's, with 4 x 2TB SAS drives in a RAID5. They connect out to the network using 1GB NIC's, with one used for the iSCSI heartbeat, however I've connected both Servers together using a built-in 10GB NIC.

Both 10GB nics have 192.168.x addresses, and are set to Private.
They both have:
-Flow Control disabled
-Jumbo Packet set to 9014 bytes
-Receive buffers set to 3000
-Transmit buffers set to 5000
-Speed/Duplex set to 10GBps Full Duplex
-Disabled VMQ

I've run iperf between the two using the 192.168.x addresses and I'm seeing a connection speed of 500-600MBps and a bandwidth of 5GBps.

I've also tried doing this with just a 10GB HA device, but the sync rate is still the same.

Don't suppose anyone out there has had this issue before, and could help improve the sync speed?
Is there anything I can add to this to help clarify it?

*EDIT- I've since restarted the Servers, made sure the Drivers were up-to-date, and now seeing a Txfr of 1.25MBps, and Bandwidth of 10.4MBps. Checked the Servers, and can see I've used a Cat5 Crossover.*
happymeal
 
Posts: 2
Joined: Thu Feb 27, 2020 11:38 am

Re: Slow sync data rate

Postby Michael (staff) » Fri Feb 28, 2020 5:24 pm

Most probably the reason is here: - > 4 x 2TB SAS drives in a RAID5.
Check out recommended settings here: https://knowledgebase.starwindsoftware. ... ssd-disks/
I believe it makes sense to start the investigation from double-checking the performance of underlying storage on both servers.
Michael (staff)
Staff
 
Posts: 308
Joined: Thu Jul 21, 2016 10:16 am

Re: Slow sync data rate

Postby happymeal » Mon Mar 02, 2020 9:53 am

Ok I'll check the storage out.
We've been using RAID5 for a while (Not seen any performance issues with backing up/restoring). We've had to squeeze as much storage out of it as possible hence the RAID5, and because we can't afford to jump over to SSD's just yet.
happymeal
 
Posts: 2
Joined: Thu Feb 27, 2020 11:38 am

Re: Slow sync data rate

Postby Michael (staff) » Tue Mar 03, 2020 11:02 am

Please keep the community updated.
Michael (staff)
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Posts: 308
Joined: Thu Jul 21, 2016 10:16 am


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