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Why the backup speed so slow with SBE 2012?

This is using Symantec Backup Exec 2012 (w/SP4) on MS Windows 2008 R2 server. However, found that the backup speed seems slow - about 550 Mb/min. This is backing up the VMs (via VMware vSphere 5.5 ESXi host), into an external LTO 6 tape drive. Please see the drivers and hardware used:

 a. Backup Exec version: version 14.0 Rev. 1798 (64-bit)
     FIPs version: not enabled

 b. HBA Card - Dell 6Gbps SAS HBA
     Driver Date: 12/14/2010 (provided by Dell)
     Driver version:

 c. Tape Drive - Dell PowerVault LTO 6 External tape drive
     * In device manager, it appears as "IBM ULTRIUM-HHS Sequential Device"
     Driver Date: 2/12/2008
     Driver Version:

What I ever experienced was the backup speed can hit 1,600 Mb/min by using SBE 2010 SP3. Does the above speed too slow? The network shouldn't has much different.

Thanks in advance.
Storage SoftwareDell

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8/22/2022 - Mon

The exact version of VMware vSphere ESXi is: 5.5.0, 1331820

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