Hi,
We are developing our new backup strategy and we are planning to use Starwind VTL as our offsite backup solution. In this scenario we experience a very pure tape backup speed but I don't have too much experience with iSCSI devices so I'm not sure if this is normal or am I doing something wrong.
In this configuration we backing up servers with a DPM 2019 in our server room to disk. From that disk we planning to create offsite backup to VTL if possible through a site2site VPN to our office where we can easily replace disks behind VTL withouth going physically to the server room.
What I found is:
speedtest.net tells us that the download speed is ~500Mbps and the upload speed is ~460+Mbps in the server room.
In our office we have a 500Mbps download speed and officially 40Mbps upload. Theoretically in this case the office downloads the content so the download speed is the interesting which is fine.
A simple file copy from our server room (from DPM server) to our office has a 165+Mbps speed.
But when I try to use DPM to offsite backup through the same site2site VPN it has a maximum of 24Mbps which is very poor compared to a simple SMB file transfer.
If I use an iSCSI target which is in the same room as our DPM server then its backup speed is also fine (~125-130Mbps).
Based on this the iSCSI config is fine. As the file copy speed and speedtest result are good I think our internet is also good on both side.
I'm not sure what can be wrong. Does anyone has any idea?
Thank you in advance!
Edit: I went through this post and also tested the bandwidth with NTTTCP and iPref tools. The results are over 100Mbps in both case so now I'm sure the net connection is fine.
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