[pve-devel] pve-manager and disk IO monitoring

[Dietmar Maurer]

> On September 30, 2016 at 8:00 AM Alexandre DERUMIER <aderumier at odiso.com>
> wrote:
> 
> 
> >>Where do you see that 11% difference? 
> 
> oh, sorry, my fault, I read the wrong line...
> Jobs: 1 (f=1): [m(1)] [100.0% done] [64339KB/16908KB/0KB /s] [15.2K/3816/0
> iops] [eta 00m:00s] 
> Jobs: 1 (f=1): [m(1)] [100.0% done] [73928KB/19507KB/0KB /s] [17.3K/4381/0
> iops] [eta 00m:00s] 
> 
> But check the latencies (>95th are twice lower) :

Where do you see that? I see that 


99.00th=[ 8768] (usec)
99.00th=[ 8] (msec)

So this is quite the same?

> 
> read
> -----
> 
> block:
> read : io=2454.9MB, bw=87501KB/s, iops=14328, runt= 28728msec 
> clat percentiles (usec): 
> | 1.00th=[ 1768], 5.00th=[ 2480], 10.00th=[ 2640], 20.00th=[ 2864], 
> | 30.00th=[ 2960], 40.00th=[ 3056], 50.00th=[ 3088], 60.00th=[ 3152], 
> | 70.00th=[ 3248], 80.00th=[ 3376], 90.00th=[ 3824], 95.00th=[ 4448], 
> | 99.00th=[ 8768], 99.50th=[13120], 99.90th=[52992], 99.95th=[103936], 
> | 99.99th=[536576] 
> 
> generic:
> 
> read : io=2454.9MB, bw=88384KB/s, iops=14473, runt= 28441msec 
> slat (usec): min=5, max=5814, avg=10.86, stdev=21.71 
> clat (usec): min=459, max=885935, avg=3451.71, stdev=3297.21 
> lat (usec): min=526, max=885944, avg=3462.97, stdev=3297.14 
> clat percentiles (msec): 
> | 1.00th=[ 3], 5.00th=[ 3], 10.00th=[ 3], 20.00th=[ 4], 
> | 30.00th=[ 4], 40.00th=[ 4], 50.00th=[ 4], 60.00th=[ 4], 
> | 70.00th=[ 4], 80.00th=[ 4], 90.00th=[ 4], 95.00th=[ 5], 
> | 99.00th=[ 8], 99.50th=[ 11], 99.90th=[ 23], 99.95th=[ 63], 
> | 99.99th=[ 153] 
>