09-18-2020 01:37 AM
Hi all,
Recently, my NetBackup 8.1 (installed on Windows Server 2012 R2) suddenly runs at very slow speed (~40% less than its optimal speed).
After some troubleshootings, I discovered that if I downgraded it to 1Gbps from 10Gbps (simply swapping the transceiver of 10Gbps SFP+ with 1Gbps SFP, refer pic below), the speed recovered back to its optimal speed.
And swapping the transceivers is the ONLY thing I do. Any idea?
09-18-2020 02:15 AM
Hi
I would have asked network folks to check the port settings with the 1 Gbps and 10 Gbps SFP and compare these. maybe there is being changed anything. Also please see from host side for duplex/speed....
09-18-2020 02:40 AM - edited 09-20-2020 12:54 AM
Bad network cable or SFP+. Try cleaning fiber optics first with a approve cleaning kit.
By downgrading to 1Gps, the numbers of bad transmissions will be reduced, since 1Gps is less sensitive to bad fiber optics than 10Gps. You should ask a network admin to look at the issue.
09-18-2020 12:21 PM
Great suggestions by @Nicolai & @quebek
Curious so asking, Do you have additional or another interface attached to the Windows NetBackup server?
I have experienced slowness when I enabled a additional interface (private vlan) on the NetBackup server. It was back to normal when I disabled the second interface. Both were 10g though.
09-27-2020 07:59 PM
@Nicolai & @quebek & @Tape_Archived
I have swapped the followings items:
still no joy :(
In fact, I'm also the network guy and i didn't, I'm sure that nothing is changed on the network side.
09-27-2020 08:10 PM
Thanks for the suggestion, my server has alot of network interfaces (1G and 10G), all have been disabled except those used for backup, still no joy :(.