Hi!

I have Adaptec 2400A RAID card on my server and the performance seems to
be really bad compared to standalone disk and raidframe. All redundant
filesystems below are RAID-1 with two 7200 rpm UDMA100 disks on separate
channels, both acting as masters. 2400A has the latest firmware and I see no
errors on the console or logs.


               -------Sequential Output-------- ---Sequential Input--
               -Per Char- --Block--- -Rewrite-- -Per Char- --Block---
Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec

wd0       100 27012 25.0 25257  6.1 35992 11.2 78933 98.3 590045 100.0 15501.1
raidframe 100 29650 27.7 36509  9.5 30542 10.0 75097 96.8 580597 99.9 21732.6
2400A     100 13430 17.5 13659  6.7 11565  7.0 53748 99.6 250435 100.0 12213.6


The 2400A test was performed on the server (AMD XP2100+) and the others on
my pc (AMD XP2400+). As you can see writing is very slow compared to
raidframe.

I couldn't use the default values for disklabel during install so I adjusted
the values according to newfs's notice. These are the current settings on ld0:


16 partitions:
#        size    offset     fstype  [fsize bsize cpg/sgs]
  a:  40965687        63     4.2BSD   4096 32768    64   # (Cyl.    0*- 2549)
  b:   4209030  40965750       swap                      # (Cyl. 2550 - 2811)
  c: 361881537        63     unused      0     0         # (Cyl.    0*- 22526*)
  d: 361881600         0     unused      0     0         # (Cyl.    0 - 22526*)
  e:  81931500  45174780     4.2BSD   4096 32768    64   # (Cyl. 2812 - 7911)
  f:  20482875 127106280     4.2BSD   4096 32768    64   # (Cyl. 7912 - 9186)
  g:  81931500 147589155     4.2BSD   4096 32768    64   # (Cyl. 9187 - 14286)
  h: 132360945 229520655     4.2BSD   4096 32768    64   # (Cyl. 14287 - 22526*)


What can I do to increate the write speed?

Martti