1516 read per second - isnt it high enough to staurate scsi?

1516 read per second - isnt it high enough to staurate scsi?

Post by hopehope_12 » Sat, 20 Aug 2005 17:47:57



Dear Gurus ,

This output belongs to my live database system on sun solaris.

Here altough i see 12Mb. per read ,  vmstat -p shows no activity via
page cache. Does this mean that the io which is shown by iostat is
direct io and by passes the buffer cache  ?

Isn't it 1516 read per second too much which saturates the device?

Kind Regards,

                  extended device statistics
device       r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd30         0.0    1.0    0.0    8.0  0.0  0.0    6.3   0   1
sd31         0.0    1.0    0.0    8.0  0.0  0.0    8.3   0   1
sd36         0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
ssd2         9.0   74.0   72.0  421.5  0.0  3.4   41.4   0  70
ssd3         0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
ssd7        14.0   82.0  112.0  446.5  0.0  4.5   47.3   0  65
ssd8         0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
ssd9         0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
ssd10     1516.0    0.0 12128.2    0.0  0.0  2.7    1.8   0 100
st1          0.0  199.0    0.0 12537.2  0.0  0.5    2.5   0  49
st18         0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
nfs1         0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0

     memory           page          executable      anonymous
filesystem
   swap  free  re  mf  fr  de  sr  epi  epo  epf  api  apo  apf  fpi
fpo  fpf
 10719984 2869576 0 0   0   0   0    0    0    0    0    0    0    0
0    0
 17386824 10710472 15 170 0 0   0    0    0    0    0    0    0    0
0    0
 17385672 10709304 13 168 0 0   0    0    0    0    0    0    0    0
0    0
 17386824 10710472 0 5  0   0   0    0    0    0    0    0    0    0
0    0
 17386824 10710472 0 0  0   0   0    0    0    0    0    0    0    0
0    0
 17386824 10710472 134 1403 8 0 0    0    0    0    0    0    0    0
8    8
 17386792 10710472 15 164 0 0   0    0    0    0    0    0    0    0
0    0
 17382688 10707264 146 1246 0 0 0    0    0    0    0    0    0    0
0    0
 17386720 10710472 136 1172 0 0 0    0    0    0    0    0    0    0
0    0
 17386792 10710472 98 673 0 0   0    0    0    0    0    0    0    0
0    0
 17386792 10710472 132 1170 0 0 0    0    0    0    0    0    0    0
0    0
 17386792 10710472 15 163 0 0   0    0    0    0    0    0    0    0
0    0
 17385640 10709304 146 1246 0 0 0    0    0    0    0    0    0    0
0    0