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HIGH iowait on our SOURCE

Posted by Thierry Lavallee via rsnapshot-discuss 
Thierry Lavallee via rsnapshot-discuss
HIGH iowait on our SOURCE
June 21, 2017 09:03AM
Hi,
It seems our rsnapshot is creating HIGH iowait on our SOURCE server. Is
there any way to leverage this a bit?
Thanks

sar -e 05:00:00
12:00:01 AM CPU %user %nice %system %iowait %steal %idle
12:10:01 AM all 3.64 0.15 0.59 1.57 0.00 94.05
12:20:01 AM all 3.93 0.11 0.65 1.52 0.00 93.80
12:30:02 AM all 4.26 0.11 0.58 1.13 0.00 93.92
12:40:01 AM all 3.86 0.13 0.59 1.00 0.00 94.42
12:50:01 AM all 4.12 0.11 0.62 1.19 0.00 93.96
01:00:01 AM all 3.61 0.11 0.49 0.74 0.00 95.05
01:10:01 AM all 4.35 0.13 0.64 0.80 0.00 94.09
01:20:01 AM all 4.72 0.12 0.71 1.56 0.00 92.89
01:30:01 AM all 4.93 0.11 0.66 1.00 0.00 93.29
01:40:01 AM all 4.31 0.13 0.70 0.97 0.00 93.90
01:50:02 AM all 4.11 0.11 0.67 0.92 0.00 94.18
02:00:01 AM all 3.89 0.11 0.56 0.73 0.00 94.72
02:10:01 AM all 4.49 0.14 0.71 0.94 0.00 93.71
02:20:01 AM all 4.29 0.11 0.68 0.88 0.00 94.03
02:30:01 AM all 3.31 0.11 0.47 0.74 0.00 95.37
02:40:01 AM all 3.76 0.13 0.61 0.87 0.00 94.63
02:50:01 AM all 3.51 0.11 0.57 0.84 0.00 94.98
03:00:01 AM all 3.84 0.11 0.51 0.75 0.00
94.80 - RSNAPSHOT START
03:10:02 AM all 6.60 0.14 1.03 _*4.18*___ 0.00
88.05 - RSNAPSHOT working
03:20:01 AM all 3.68 0.11 0.83 _*16.19*_ 0.00
79.18 - RSNAPSHOT working
03:30:02 AM all 3.93 0.11 0.81 _*12.27*_ 0.00
82.87 - RSNAPSHOT working
03:40:02 AM all 4.20 0.12 0.73 _*15.88*_ 0.00
79.07 - RSNAPSHOT working
03:50:01 AM all 3.70 0.11 0.91 _*13.84*_ 0.00
81.44 - RSNAPSHOT working
04:00:02 AM all 3.87 0.11 0.97 _*22.54*_ 0.00
72.51 - RSNAPSHOT working
04:10:01 AM all 4.15 0.15 0.85 _*15.54*_ 0.00
79.30 - RSNAPSHOT working
04:20:01 AM all 3.25 0.11 0.62 _*5.44*_ 0.00
90.58 - RSNAPSHOT END
04:30:01 AM all 3.38 0.11 0.52 2.47 0.00 93.53
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