[Veritas-bu] Veritas-bu Digest, please top urgent

Dear All
I have NBU 6.5.4 installed on server 2003 to backup ADs server and exchange mlast two weeks became very slow and some times not comleted specialy Exchange server stopped totaly ( data over 600Gb) and give this errors: I need your advice please .

12/9/2010 7:44:16 PM - requesting resource ktm-backup1-hcart-robot-tld-0
12/9/2010 7:44:16 PM - requesting resource ktm-backup1.NBU_CLIENT.MAXJOBS.ktm-mail
12/9/2010 7:44:16 PM - requesting resource ktm-backup1.NBU_POLICY.MAXJOBS.Exchange
12/9/2010 7:44:16 PM - granted resource ktm-backup1.NBU_CLIENT.MAXJOBS.ktm-mail
12/9/2010 7:44:16 PM - granted resource ktm-backup1.NBU_POLICY.MAXJOBS.Exchange
12/9/2010 7:44:16 PM - granted resource 2932LT
12/9/2010 7:44:16 PM - granted resource HP.ULTRIUM4-SCSI.000
12/9/2010 7:44:16 PM - granted resource ktm-backup1-hcart-robot-tld-0
12/9/2010 7:44:17 PM - estimated 0 kbytes needed
12/9/2010 7:44:17 PM - started process bpbrm (5576)
12/9/2010 7:44:18 PM - connecting
12/9/2010 7:44:20 PM - connected; connect time: 00:00:02
12/9/2010 7:49:06 PM - mounting 2932LT
12/9/2010 7:49:11 PM - Error bptm(pid=5808) error requesting media, TpErrno = Robot operation failed
12/9/2010 7:49:11 PM - Warning bptm(pid=5808) media id 2932LT load operation reported an error
12/9/2010 7:49:11 PM - current media 2932LT complete, requesting next resource Any
12/9/2010 7:49:19 PM - granted resource 2974LT
12/9/2010 7:49:19 PM - granted resource HP.ULTRIUM4-SCSI.000
12/9/2010 7:49:19 PM - granted resource ktm-backup1-hcart-robot-tld-0
12/9/2010 7:49:20 PM - mounting 2974LT
12/9/2010 7:50:04 PM - mounted; mount time: 00:00:44
12/9/2010 7:50:08 PM - positioning 2974LT to file 1
12/9/2010 7:50:13 PM - positioned 2974LT; position time: 00:00:05
12/9/2010 7:50:13 PM - begin writing
12/9/2010 9:03:16 PM - Error bptm(pid=5808) cannot write image to media id 2974LT, drive index 0, The request could not be performed because of an I/O device error.
12/9/2010 9:03:23 PM - end writing; write time: 01:13:10
media write error(84)

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