Hi All
we found High iowait on netbackup server. Please help me to identify the cause.
84 processes: 80 sleeping, 3 zombie, 1 on cpu
CPU states: 0.0% idle, 0.6% user, 1.3% kernel, 98.1% iowait, 0.0% swap
Memory: 4096M real, 2963M free, 243M swap in use, 11G swap free
bash-2.03$ iostat 2 5
tty md0 md1 md2 md5 cpu
tin tout kps tps serv kps tps serv kps tps serv kps tps serv us sy wt id
0 5 31 6 18 17 5 13 17 5 13 0 0 30 3 11 23 64
0 117 0 0 0 0 0 0 0 0 0 0 0 0 4 5 91 0
0 40 0 0 0 0 0 0 0 0 0 0 0 0 5 6 90 0
0 40 0 0 0 0 0 0 0 0 0 0 0 0 0 1 98 0
0 40 0 0 0 0 0 0 0 0 0 0 0 0 4 8 88 0
found no error on the IO, and no error on dmesg.
bash-2.03$ iostat -En
c0t0d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: SEAGATE Product: ST314670LSUN146G Revision: 045A Serial No: 4742XAET
Size: 146.80GB <146800115712 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
c0t1d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: SEAGATE Product: ST314670LSUN146G Revision: 045A Serial No: 4742XHCH
Size: 146.80GB <146800115712 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
c0t2d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: HITACHI Product: HUS10143ASUN146G Revision: PA05 Serial No: 26TVYSJR
Size: 146.80GB <146800115712 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
c0t3d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: HITACHI Product: HUS10143ASUN146G Revision: PA05 Serial No: 26TVYL48
Size: 146.80GB <146800115712 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
rmt/1 Soft Errors: 0 Hard Errors: 4 Transport Errors: 0
Vendor: HP Product: Ultrium 2-SCSI Revision: F63Z Serial No:
rmt/4 Soft Errors: 0 Hard Errors: 0 Transport Errors: 40
Vendor: HP Product: Ultrium 2-SCSI Revision: F63Z Serial No:
rmt/2 Soft Errors: 0 Hard Errors: 1 Transport Errors: 0
Vendor: IBM Product: ULTRIUM-TD2 Revision: 53Y3 Serial No:
rmt/0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 8
Vendor: HP Product: Ultrium 2-SCSI Revision: F63Z Serial No:
bash-2.03$
