Problem
I am averaging 1.5MB/sec. backing up data from my AoE setup. Sometimes I can get up to 4MB/sec., but that's rare. Only ONE client is pulling the files, there is zero multiuser access going on. Anyone have any thoughts?
Target
Software: vblade 18 OR kvblade alpha-3 (same results)
CPU: 1.7GHz P4
Memory: 256MB (system only uses 23MB)
OS: CentOS 4.6, current updates and kernel
Network: 32-bit Gigabit Broadcom card
Disk: Single 750GB PATA
Network
Switch: US Robotics Gigabit
Cables: Cat 5e
Initiator
Software: StarPort 3.6 Build 0x20080410
CPU: Dual Xeon 3.4GHz
Memory: 3GB
OS: Windows 2003 SP2, current updates and drivers
Network: 64-bit Gigabit Broadcom (I think? Built into the motherboard, which is a relatively new HP DL380 G4, pretty fast)
Partition: NTFS
Files: Usually megabytes in size, rarely small
Backup program: BakBone's NetVault
The bottleneck could be the target's NIC but I don't think that's the case; I can pull a 1GB file using netcat+cpio at an average of 10MB/sec., even when the backup is running over AoE at the same time!
I've noticed that often the backup will stall for several seconds for no apparent reason. But even when it's going at full steam the speed hovers at around 2.5MB/sec. (with the stalls, I average 1.5MB/sec.) This same backup software can back up files directly from the initiator's local hard drive at around 10MB/sec.
At the moment I'm using kvblade on the target; uptime is less than 0.10 and kvblade itself uses less than 3% of the CPU.
Thoughts?
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