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Conference decwet::advfs_support

Title:AdvFS Support/Info/Questions Notefile
Notice:note 187 is Freq Asked Questions;note 7 is support policy
Moderator:DECWET::DADDAMIO
Created:Wed Jun 02 1993
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1077
Total number of notes:4417

1047.0. "Is it an advfs problem?" by NNTPD::"mcdonald@decatl.alf.dec.com" (John McDonald) Tue Apr 22 1997 17:55

Hi,

I'm working a series of issues with a customer that's trying to get
their system switched over to Digital UNIX from HP. We've pretty
much got all of their ase and other things straightened out, but now
they're running into some performance issues. They're using
Progress database, writing to a raid 3/5 unit on an HSZ50. The
filesystem is advfs (data1_domain). They've got 512MB of memory
and 32MB of cache on the HSZ50, and they're running DU 4.0b. I've
been doing some monitoring and I'm not sure is the problem is
with the way advfs is configured or not. I had them increase
AdvfsMaxCachePercent to 20, but that didn't seem to help too
much. They've run other benchmarks in the past on this same
config, and they claim to have seen about 10-12MB/sec throughput
on the device. They don't have any docs on what the config was when
they ran that, though.

Here's some of the monitoring output:

First, the advfsstat output for the domain in question. There's only
1 device in the domain (rz130c) and they're using it for Progress
data: and temp space:

Tue Apr 22 15:06:08 EDT 1997
vol1                                        
  rd  wr  rg arg  wg awg blk wlz rlz con dev
   3 587   3 128  12  65   0   3   3   0   1
   3 581   3 128  12  61   0   3   3   0   1
   2 453   2 128  10  64   0   3   3   0   1
  15 453   3 128  12  68   0   3   3   0   1
   5 465   3 128  16  65   0   3   3   0   1
  31 414   0   0  12  68   0   3   3   0   0
  34 428   2 128  12  70   0   4   3   0   1
   3 673   3 128  14  65   0   3   1   0   0
   2 640   2 128  12  68   0   3   4   0   0
   3 597   3 128  12  70   0   3   4   0   1
Tue Apr 22 15:06:38 EDT 1997
vol1                                        
  rd  wr  rg arg  wg awg blk wlz rlz con dev
   4 579   4 128  15  72   0   3   2   0   1
   3 611   3 128  13  70   0   3   4   0   0
   3 587   3 128  12  73   0   0   7   0   0
   3 582   3 128  12  73   0   0   4   0   0
   4 584   4 128  11  74   0   3   4   0   1
   3 564   3 128  12  73   0   3   4   0   1
   3 570   3 128  13  67   0   3   4   0   0
   4 634   4 128  24  66   0   3   4   0   0
   3 644   3 128  14  68   0   3   4   0   1
   3 600   3 128  22  64   0   0   7   0   0
Tue Apr 22 15:07:08 EDT 1997
vol1                                        
  rd  wr  rg arg  wg awg blk wlz rlz con dev
   4 612   4 128  15  73   0   0   7   0   0
   4 642   4 128  12  73   0   3   4   0   0
   4 664   4 128  28  61   0   0   2   0   1
   3 662   3 128  29  61   0   3   4   0   0
   3 636   3 128  12  73   0   3   4   0   0
   3 622   3 128  22  63   0   3   4   0   0
   4 663   4 128  35  59   0   0  10   0   0
   3 645   3 128  13  68   0   3   4   0   1
   4 588   4 128  14  68   0   3   4   0   1
   3 574   3 128  11  75   0   3   4   0   0
Tue Apr 22 15:07:38 EDT 1997
vol1                                        
  rd  wr  rg arg  wg awg blk wlz rlz con dev
   4 581   4 128  14  75   0   3   2   0   0
   3 615   3 128  12  76   0   3   4   0   0
   3 613   3 128  11  75   0   3   4   0   0
   4 606   4 128  15  73   0   3   0   0   0
   3 613   3 128  14  70   0   3   4   0   1
   2 222   2 128   4  64   0   3  16   0   3
   2 462   2 128  12  72   0   3   4   0   1
   3 593   3 128  12  72   0   3   4   0   1
   4 638   4 128  14  68   0   3   4   0   1
   4 605   4 128  15  73   0   3   4   0   0
Tue Apr 22 15:08:08 EDT 1997
vol1                                        
  rd  wr  rg arg  wg awg blk wlz rlz con dev
   3 598   3 128  12  74   0   3   4   0   1
   4 635   4 128  15  73   0   3   1   0   0
   3 625   3 128  13  68   0   3   4   0   0
   3 603   3 128  13  70   0   3   4   0   0
   4 621   4 128  17  67   0   3   4   0   1
   3 627   3 128  14  65   0   3   4   0   1
   4 614   4 128  12  73   0   3  14   0   8
   3 592   3 128  16  71   0   3   4   0   0
   4 641   4 128  13  71   0   3   4   0   1
   3 565   3 128  12  73   0   0   7   0   0
Tue Apr 22 15:08:38 EDT 1997
vol1                                        
  rd  wr  rg arg  wg awg blk wlz rlz con dev
   3 540   3 128  11  75   0   3   4   0   0
   3 579   3 128  11  77   0   3   4   0   0
   3 580   3 128  12  73   0   3   4   0   0
   3 583   3 128  12  72   0   3   4   0   1
   4 583   4 128  15  71   0   3   0   0  19
   3 588   3 128  12  74   0   0   7   0   0
   4 596   4 128  12  70   0   3   4   0   1
   4 643   4 128  15  72   0   3   2   0   1
   3 620   3 128  14  67   0   3   4   0   1
   3 634   3 128  12  73   0   3   4   0   1
Tue Apr 22 15:09:08 EDT 1997
vol1                                        
  rd  wr  rg arg  wg awg blk wlz rlz con dev
   4 570   4 128  15  72   0   3   0   0   0
   3 593   3 128  14  64   0   3   4   0   1
   3 463   3 128  12  66   0   3   4   0   0
   3 549   3 128  12  74   0   3   3   0   0
  11 489   1 128  10  68   0   3   3   0   1
  35 486   0   0  14  66   0   3   3   0   1
  27 524   0   0  12  62   0   3   3   0   1
  22 489   4 128  15  65   0   3   3   0   1
   4 534   4 128  16  63   0   3   2   0   0
   3 502   3 128  11  64   0   3   3   0   0
Tue Apr 22 15:09:39 EDT 1997
vol1                                        
  rd  wr  rg arg  wg awg blk wlz rlz con dev
  26 478   0   0  11  65   0   3  10   0   1
  28 513   0   0  16  61   0   3   3   0   0
  36 481   0   0  10  68   0   3  14   0   0
  29 455   2 128  16  64   0   3   3   0   0
   3 516   3 128  10  68   0   3   3   0   1
   4 488   4 128  13  67   0   3   3   0   1
  12 501   1 128  12  65   0   0   6   0   0
  28 417   0   0  12  62   0   3   4   0   0
  24 596   4  96  19  63   0   3   3   0   0
  34 433   0   0  11  72   0   3   2   0   1
Tue Apr 22 15:10:09 EDT 1997
vol1                                        
  rd  wr  rg arg  wg awg blk wlz rlz con dev
  25 425   2 128   9  67   0   3   2   0   1
   4 496   4 128  12  65   0   3   2   0   1
   3 443   3 128   9  69   0   4   5   0   1
   5 675   5 128  18  89   0   3   4   0   0
   5 713   5 128  32  75   0   3   3   0   0
  23 779   2 128  53  64   0   3   3   0   1
  50 782   0   0  87  59   0   3   0   0  29
  36 751   0   0  81  58   0   3   7   0   1
  33 742   0   0  70  58   0   3   7   0   0
  14 800   6 128 100  57   0   3   3   0   1

This is just a sample, but the rest is pretty much the same. Next is the
iostat output for the device in the domain (rz130c). This was run at the
same time:

Tue Apr 22 15:05:07 EDT 1997
      tty     fd0      rz8    rz130    rz140     cpu
 tin tout bps tps  bps tps  bps tps  bps tps  us ni sy id
   1   86   0   0  184  16  124   4  198   9   1  5  2 92
   0  421   0   0   84  11 1628 188  101   5   1 26  8 65
   0  219   0   0   26   4 1934 223   32   2   3 28  6 63
   0  211   0   0   52   7 1968 224   56   2   0 27  6 66
   0  211   0   0   95  10 1915 221   53   2   3 28  6 63
   0  196   0   0   87  12 1899 214   35   2   2 25  7 66
   0  211   0   0   45   6 1976 228   43   2   3 27  6 64
   0  196   0   0   34   5 1913 217   13   2   0 26  5 68
   0  400   0   0   47   7 2022 206   93   4   1 24  8 67
   0  318   0   0   34   6 1939 206   53   3   3 27  6 63
Tue Apr 22 15:05:34 EDT 1997
      tty     fd0      rz8    rz130    rz140     cpu
 tin tout bps tps  bps tps  bps tps  bps tps  us ni sy id
   1   87   0   0  184  16  127   4  198   9   1  5  2 92
   0  355   0   0  317  31 1817 189   51   2   1 24  6 68
   0  303   0   0  194  19 1835 193   11   1   0 25  6 68
   0  383   0   0   45   7 2043 204  117   9   3 24  6 67
   0 1580   0   0   51   7 1771 181  112   7   0 26  7 67
   0  145   0   0   80  13 2467 256   32   2   1 19  8 73
   0  145   0   0  102  10 2560 266   24   2   0 20  6 74
   0  948   0   0   52   7 2297 234   88   5  18 22  6 54
   0 1910   0   0   36   5 1745 178  107   6  40 28  7 25
   0  187   0   0   36   5 1809 194   75   2  29 26  6 39
Tue Apr 22 15:06:01 EDT 1997
      tty     fd0      rz8    rz130    rz140     cpu
 tin tout bps tps  bps tps  bps tps  bps tps  us ni sy id
   1   88   0   0  184  16  131   5  197   9   1  5  2 92
   0  271   0   0   52   7 1926 207   56   2   3 27  6 64
   0  203   0   0  105  10 1984 210   43   2   0 28  6 66
   0  890   0   0   73  10 1518 175   91   5   0 28  9 63
   4  268   0   0   26   4 1779 203   24   2   3 29  6 62
   2  476   0   0  103  15 1427 160   95   4   0 28  5 66
   0  183   0   0   39   6 1390 156  115   3   0 33  5 62
   0  167   0   0   39   5 1489 158  117   3   0 32  5 62
   0  296   0   0   52   7 1319 152   85   4   3 32  5 61
   0  302   0   0   63   9 1379 159  125   5   0 30  5 65
Tue Apr 22 15:06:28 EDT 1997
      tty     fd0      rz8    rz130    rz140     cpu
 tin tout bps tps  bps tps  bps tps  bps tps  us ni sy id
   1   88   0   0  183  16  134   5  197   9   1  5  2 92
   0  697   0   0   71   9 1713 192   85   5   1 26  8 66
   0  198   0   0   39   5 1902 220   21   2   3 25  6 66
   0  423   0   0  133  16 1713 191  101   5   1 25  6 69
   0  185   0   0   58   8 1854 210   75   2   0 25  6 68
   0  206   0   0   62   9 1771 198   75   2   0 26  5 69
   0  183   0   0   56   8 1769 196   56   2   3 27  6 64
   0  183   0   0   69  10 1734 193   75   2   1 27  8 65
   0  192   0   0   48   7 1745 197   75   2   0 28  6 67
   3  170   0   0   46   6 1745 197   75   2   3 28  5 64
Tue Apr 22 15:06:55 EDT 1997
      tty     fd0      rz8    rz130    rz140     cpu
 tin tout bps tps  bps tps  bps tps  bps tps  us ni sy id
   1   89   0   0  183  16  137   5  197   9   1  5  2 92
   3  326   0   0   72  10 1731 195   75   2   0 26  5 69
   0  175   0   0   41   6 1907 209   53   2   0 26  5 69
   0  175   0   0   59   8 1853 203   80   3   3 27  5 65
   0  175   0   0  102  10 1923 209   75   2   0 26  6 68
   0  175   0   0   90  13 1761 199   53   2   0 26  8 65
   0  177   0   0   33   5 1915 212   77   3   0 28  6 66
   0  168   0   0   51   8 1989 220   75   2   3 27  6 65
   0  168   0   0   28   4 2016 223   75   2   0 27  5 67
   0  168   0   0   52   7 2022 218   77   3   0 27  6 67
Tue Apr 22 15:07:22 EDT 1997
      tty     fd0      rz8    rz130    rz140     cpu
 tin tout bps tps  bps tps  bps tps  bps tps  us ni sy id
   1   89   0   0  183  16  141   6  197   9   1  5  2 92
   0  152   0   0   70  10 1873 205   53   2   3 25  5 67
   0  168   0   0   31   4 2019 222   75   2   0 27  6 67
   0  168   0   0   49   8 2005 216   77   3   2 27  8 63
   0  176   0   0   36   6 1897 215   77   3   2 27  6 65
   0  144   0   0  147  19 1657 186   53   2   1 25  7 67
   0  160   0   0   61   9 1739 197   75   2   3 26  5 66
   0  160   0   0   66   9 1833 202   77   3   0 27  5 68
   0  168   0   0   48   7 1811 205   75   2   0 27  5 68
   0  160   0   0   45   6 1803 202   53   2   3 26  8 63
Tue Apr 22 15:07:49 EDT 1997
      tty     fd0      rz8    rz130    rz140     cpu
 tin tout bps tps  bps tps  bps tps  bps tps  us ni sy id
   1   89   0   0  183  16  144   6  197   9   1  5  2 92
   0  160   0   0  143  12 1785 201   75   2   0 26  6 68
   0  112   0   0   46   6 1204 134   51   2   0 17  4 78
   0   72   0   0   26   4  860  95   27   1   0 12  3 85
   0  168   0   0   61   9 1851 204   77   3   3 27  6 64
   0  168   0   0   43   6 1825 206   56   2   0 27  5 68
   0  168   0   0   31   4 1809 205   75   2   0 27  5 67
   0  160   0   0   68   9 1809 199   77   3   3 27  8 62
   0  176   0   0   95  10 1880 214   53   2   0 28  6 66
   0  168   0   0   52   8 1915 212   77   3   0 28  6 66
Tue Apr 22 15:08:17 EDT 1997
      tty     fd0      rz8    rz130    rz140     cpu
 tin tout bps tps  bps tps  bps tps  bps tps  us ni sy id
   1   89   0   0  182  16  147   6  196   9   1  5  2 92
   0  168   0   0   58   8 1835 208   75   2   0 27  5 67
   0  168   0   0   28   4 1795 203   75   2   3 28  6 63
   0  160   0   0   62   9 1875 206   77   3   2 29  6 64
   0  176   0   0   28   4 1907 215   53   2   3 29  6 63
   0  152   0   0   78  12 1691 189   75   2   3 25  8 64
   0  168   0   0   36   5 1947 215   80   3   0 28  6 66
   0  175   0   0  118  14 1726 195   74   2  35 28  7 30
   0  152   0   0   60   8 1649 185   53   2  12 27  5 56
   0  176   0   0   28   4 1761 199   75   2   0 27  5 67
Tue Apr 22 15:08:44 EDT 1997
      tty     fd0      rz8    rz130    rz140     cpu
 tin tout bps tps  bps tps  bps tps  bps tps  us ni sy id
   1   89   0   0  182  16  150   7  196   9   1  5  2 92
   0  160   0   0   87  11 1683 189   75   2   0 26  6 68
   5  173   0   0   47   7 1753 195   75   2   1 27  8 64
   0  324   0   0   66   9 1683 189   53   2   3 26  5 66
   0  175   0   0   87  12 1795 197   77   3   0 27  6 67
   0  175   0   0   45   6 1790 203   75   2   0 26  6 68
   0  175   0   0   37   5 1854 210   53   2   3 26  6 66
   0  183   0   0   42   6 1857 204   80   3   0 27  6 67
   0  183   0   0   34   5 1877 213   75   2   0 28  5 66
   0  185   0   0   72  10 1745 197   53   2   3 26  8 63
Tue Apr 22 15:09:11 EDT 1997
      tty     fd0      rz8    rz130    rz140     cpu
 tin tout bps tps  bps tps  bps tps  bps tps  us ni sy id
   1   89   0   0  182  16  153   7  196   9   1  5  2 92
   0  214   0   0  123  13 1860 205   56   2   0 27  6 66
   0 2148   0   0   48   6 1249 137  146  10   0 31  6 62
   0  342   0   0   64  10 1769 199   99   5   0 27  6 67
   0  223   0   0   46   6 1553 179   93   2   3 30  6 62
   0  199   0   0   86  13 1406 160   75   2   0 26  5 69
   0  231   0   0   25   5 1574 185  115   3   0 30  6 65
   0  207   0   0   44   6 1542 171   75   2   3 28  8 62
   0  231   0   0   36   5 1641 180   99   3   0 31  5 64
   0  231   0   0   79  11 1516 171   93   2   1 30  7 63

It looks like they're only seeing 1.5-2.5MB/sec on the device,
but I can't figure out if advfs isn't getting the writes out
there any faster or if the HSZ50 isn't accepting them any
faster. I also monitored the memory usage during the test. the
free page number was consistently low, so I'm thinking it might
be a memory bottleneck:

Tue Apr 22 15:05:20 EDT 1997
Virtual Memory Statistics: (pagesize = 8192)
  procs    memory         pages                          intr        cpu      
  r  w  u  act  free wire fault cow zero react pin pout  in  sy  cs  us  sy 
id
  3137 32   44K  248  18K 584K  84K 348K 2650  92K  588  80  1K 674   6   2 
92
  4137 31   44K  127  18K  297   21  247    0   24    0 257  3K  1K  31   7 
63
  3137 32   44K  127  18K  170   21  123    0   23    0 255  3K  1K  28   6 
67
  4137 31   44K  110  18K  108    0  108    0    0    0 236  3K  1K  26   5 
69
  4137 31   44K  104  18K  319    0  319    0    0    0 245  5K  1K  25   9 
67
  4137 31   44K  104  18K  179   24  127    0   28    0 297  4K  1K  29   6 
65
  4137 31   44K  376  18K  376   40  151    0   91    0 291  4K  1K  27   7 
66
  4137 31   44K  292  18K  172   22  123    0   23    0 216  3K  1K  26   6 
69
  4137 31   44K  174  18K  112    0  112    0    0    0 242  3K  1K  27   6 
67
  3137 32   44K  104  18K  246   37  167    0   42    0 244  3K  1K  24   7 
70
Tue Apr 22 15:05:50 EDT 1997
Virtual Memory Statistics: (pagesize = 8192)
  procs    memory         pages                          intr        cpu      
  r  w  u  act  free wire fault cow zero react pin pout  in  sy  cs  us  sy 
id
  4137 31   44K  217  18K 586K  84K 349K 2650  92K  588  80  1K 676   6   2 
92
  4137 31   44K  149  18K  296   23  245    0   24    0 271  3K  1K  26   6 
68
  4137 31   45K  107  18K  192   22  143    0   23    0 404  2K  1K  46   7 
47
  4136 32   44K  120  18K  147    0  147    0    0    0 403  4K  1K  74   7 
19
  3137 32   45K  104  18K  179   24  127    0   28    0 300  3K  1K  37   6 
57
  3137 32   44K  128  18K  107    0  107    0    0    0 232  3K  1K  31   5 
64
  3137 32   44K  128  18K  184   21  137    0   23    0 219  3K  1K  30   6 
64
  4136 31   44K  128  18K  336    0  318    0    7    0 227  5K  1K  28   8 
64
  3137 32   44K  128  18K  188   25  130    0   35    0 240  3K  1K  30   6 
64
  4137 31   45K  120  18K  178   22  129    0   23    0 177  2K  1K  32   5 
63
Tue Apr 22 15:06:21 EDT 1997
Virtual Memory Statistics: (pagesize = 8192)
  procs    memory         pages                          intr        cpu      
  r  w  u  act  free wire fault cow zero react pin pout  in  sy  cs  us  sy 
id
  4137 31   44K  248  18K 588K  84K 351K 2650  92K  588  80  1K 677   6   2 
92
  4137 31   44K  129  18K  294   21  245    0   24    0 175  2K  1K  36   5 
59
  4136 32   44K  114  18K  178   21  130    0   23    0 184  2K  1K  31   5 
65
  3137 32   44K  128  18K  419   24  350    0   38    0 201  5K  1K  29   8 
63
  4137 31   44K  128  18K  107    0  107    0    0    0 250  3K  1K  26   6 
68
  4137 31   44K  120  18K  113    0  113    0    0    0 232  3K  1K  29   5 
66
  3137 32   44K  112  18K  439   61  167    0  114    0 251  3K  1K  26   6 
68
  3137 32   44K  128  18K  155   15  124    0   19    0 223  2K  1K  25   5 
70
  3137 32   44K  121  18K  109    0  109    0    0    0 224  2K  1K  29   5 
66
  4137 31   44K  111  18K  172   23  123    0   23    0 223  2K  1K  27   5 
68
Tue Apr 22 15:06:51 EDT 1997
Virtual Memory Statistics: (pagesize = 8192)
  procs    memory         pages                          intr        cpu      
  r  w  u  act  free wire fault cow zero react pin pout  in  sy  cs  us  sy 
id
  4137 31   44K  237  18K 590K  84K 353K 2650  92K  588  81  1K 678   6   2 
92
  5136 30   44K  127  18K  313   21  245    0   31    0 223  2K  1K  30   6 
64
  4137 31   45K   88  18K  242   45  142    0   51    0 244  2K  1K  27   5 
68
  3137 32   45K   96  18K  143   10  116    0   16    0 233  2K  1K  25   5 
70
  3137 32   44K  112  18K  107    0  107    0    0    0 232  2K  1K  27   5 
68
  3137 32   45K  104  18K  107    0  107    0    0    0 238  2K  1K  31   6 
64
  3137 32   44K  137  18K  218   37  139    0   42    0 239  4K  1K  25   9 
66
  4135 32   45K  112  18K  320    0  320    0    0    0 235  2K  1K  28   5 
67
  3136 32   45K  103  18K  106    0  106    0    0    0 244  2K  1K  30   6 
64
  3136 32   45K  102  18K  169   21  122    0   23    0 244  2K  1K  27   5 
68
Tue Apr 22 15:07:21 EDT 1997
Virtual Memory Statistics: (pagesize = 8192)
  procs    memory         pages                          intr        cpu      
  r  w  u  act  free wire fault cow zero react pin pout  in  sy  cs  us  sy 
id
  4136 31   44K  232  18K 592K  84K 354K 2650  93K  588  81  1K 680   6   2 
92
  3136 32   45K  128  18K  401   55  275    0   64    0 239  3K  1K  28   6 
65
  3136 32   45K  128  18K  107    0  107    0    0    0 240  2K  1K  27   5 
68
  3136 32   45K  128  18K  314    0  314    0    0    0 246  4K  1K  29   8 
63
  3136 32   45K  128  18K  106    0  106    0    0    0 238  2K  1K  28   6 
67
  4135 32   45K  101  18K  179   15  122    0   27    0 412  3K  1K  28   7 
65
  4136 31   44K  128  18K  415   61  168    0  106    0 249  2K  1K  28   6 
66
  3136 32   44K  133  18K  107    0  107    0    0    0 232  2K  1K  27   5 
68
  3136 32   45K  120  18K  169   21  122    0   23    0 229  2K  1K  27   6 
68
  3136 32   45K  120  18K  107    0  107    0    0    0 228  2K  1K  27   5 
68
Tue Apr 22 15:07:52 EDT 1997
Virtual Memory Statistics: (pagesize = 8192)
  procs    memory         pages                          intr        cpu      
  r  w  u  act  free wire fault cow zero react pin pout  in  sy  cs  us  sy 
id
  3136 32   44K  253  18K 595K  85K 356K 2650  93K  588  81  1K 681   6   2 
92
  3136 32   45K  128  18K  375   42  260    0   64    0 186  2K  1K  21   5 
74
  4136 31   45K  112  18K  107    0  107    0    0    0  76 969 646   8   2 
90
  4136 31   45K  120  18K  106    0  106    0    0    0 237  3K  1K  31   6 
64
  3136 32   45K  112  18K  153   15  122    0   19    0 226  2K  1K  26   5 
69
  3136 32   45K  111  18K  108    0  108    0    0    0 234  2K  1K  28   6 
66
  3136 32   45K  120  18K  378   21  330    0   23    0 220  4K  1K  29   8 
63
  3136 32   45K  136  18K  107    0  107    0    0    0 248  2K  1K  28   6 
66
  3136 32   45K  120  18K  169   21  122    0   23    0 238  2K  1K  28   5 
66
  4136 31   45K  112  18K  189   25  127    0   29    0 236  3K  1K  28   6 
67
Tue Apr 22 15:08:22 EDT 1997
Virtual Memory Statistics: (pagesize = 8192)
  procs    memory         pages                          intr        cpu      
  r  w  u  act  free wire fault cow zero react pin pout  in  sy  cs  us  sy 
id
  4136 31   44K  240  18K 596K  85K 357K 2650  93K  588  82  1K 682   6   2 
92
  3136 32   45K  120  18K  357   43  260    0   47    0 398  3K  1K  30   6 
64
  4135 32   45K  114  18K  107    0  107    0    0    0 284  3K  1K  31   6 
63
  4136 31   45K  128  18K  365   15  334    0   19    0 265  4K  1K  28   8 
64
  3136 32   45K  128  18K  106    0  106    0    0    0 267  2K  1K  28   6 
66
  5135 31   45K  120  18K  375   40  150    0   91    0 409  3K  1K  62   7 
31
  3136 32   45K  128  18K  170   22  122    0   23    0 294  2K  1K  39   6 
55
  4136 31   45K  128  18K  107    0  107    0    0    0 218  2K  1K  28   6 
67
  3136 32   45K  118  18K  243   45  142    0   51    0 224  2K  1K  26   6 
68
  3136 32   45K  128  18K  327    0  315    0    6    0 228  4K  1K  27   8 
65
Tue Apr 22 15:08:53 EDT 1997
Virtual Memory Statistics: (pagesize = 8192)
  procs    memory         pages                          intr        cpu      
  r  w  u  act  free wire fault cow zero react pin pout  in  sy  cs  us  sy 
id
  4137 31   44K  254  18K 599K  85K 359K 2650  93K  588  82  1K 683   6   2 
92
  4137 31   45K  120  18K  407   60  277    0   66    0 240  2K  1K  27   6 
67
  4137 31   45K  120  18K  110    0  110    0    0    0 229  2K  1K  26   6 
68
  4137 31   45K  120  18K  107    0  107    0    0    0 231  2K  1K  29   6 
66
  3137 32   45K  120  18K  107    0  107    0    0    0 227  2K  1K  27   6 
67
  4137 31   45K  120  18K  107    0  107    0    0    0 234  2K  1K  28   5 
67
  3137 32   45K  112  18K  380   21  333    0   23    0 227  4K  1K  29   8 
63
  4137 31   45K  128  18K  182   26  128    0   28    0 242  2K  1K  28   6 
66
  4137 31   45K  120  18K  213   21  166    0   23    0 177  4K  1K  31   7 
62
  4137 31   45K  120  18K  118    0  110    0    1    0 221  3K  1K  28   6 
66

Anyone have any other ideas?

thanx.

John McDonald
Atlanta CSC


[Posted by WWW Notes gateway]
T.RTitleUserPersonal
Name
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1047.1SMURF::SCOTTTue Apr 22 1997 20:5919
john,

The advfsstat output seems to indicate that the I/O system isn't being 
stressed heavily.  The queue statistics, however, can be misleading, as 
advfsstat shows a snapshot value rather than an interval value.  

The iostat shows a low bps:tps ratio.  This could be an artifact of the 
application's I/O characteristics.  Is the I/O randomly located, as 
opposed to sequential?  Does this application make any fsync calls?

With a light steady I/O load, advfs on v4.0 is too aggressive in handling 
its I/O requests.  You might improve the performance by using chvol (-t) 
to increase the I/O threshold (try 32768).  This will allow for more 
opportunity to take a hit on a buffer sitting on the I/O queue, as well as 
improve I/O consolidation.

Hope this helps.

larry
1047.2KITCHE::schottEric R. Schott USG Product ManagementTue Apr 22 1997 21:0610
Do you have any sys_check output?

There are a lot of parameters that can be affecting this...

be sure they have dskcoll program so we get some better I/O stats...

regards

Eric

1047.3Thanx so farNNTPD::"mcdonald@decatl.alf.dec.com"John McDonaldWed Apr 23 1997 13:2915
Thanx for the replies larry/eric,

I'm still gathering data, but after I posted the original note I went ahead
and ran diskx -p on another device on the hsz50 to see what kind of
throughput we were seeing at the HW level. I ran it fixed size with the
transfer size the same as the apps, and variable size, and both results
showed a throughput of about 2MB/sec. I'm also checking out their hsz50
to make sure they haven't done something like turn the cache off.

Once again, thanx for the pointers.

John McDonald
Atlanta CSC

[Posted by WWW Notes gateway]