throughput speed problem on SCSI

Hello guys,

I've a problem on vmware esxi 5.0 on Proliant Dl380 G6 with LSI scsi device where is attach external backup loader.

Everything was fine for two years, speed throughput for backup was about 1,3Gb for minute using Symantec Backup Exec.

Suddenly last week no longer works, speed throughput changed to 133Mb/s constant speed, seems there is a limiter!

I've try to change cable and backup autoloader device but problem persist, on LSI scsi is attach only backup and no device or disks.

I don't know what happened, maybe there is a kind of debug on Vmware system for trouble this problem?

I hope in your support.

Note: the throughput speed is the same both on local disk or network ..

Thanks

Bye

Andrea