On 2010-05-11, Schafhauser, Florian <[email protected]> wrote: > Am 07.05.2010 11:35, schrieb Stuart Henderson: >> On 2010-05-06, Schafhauser, Florian <[email protected]> wrote: >>> Hello, >>> >>> the RAID Controller causes trouble with OpenBSD 4.5 and 4.6. >> >> First off, for mpi(4) you want one of these patches: >> >> ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.5/common/015_mpi.patch >> ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.6/common/009_mpi.patch >> ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.7/common/002_mpi.patch >> >>> Reading and writing is quite slow. When I use I/O intensive applications > like >>> squid, machine dies within next 30 minutes. > > I applied the patch in this way: > cvsup -g -L2 /etc/cvsup > patch -p1 < 009_mpi.patch > rebuild the kernel > reboot > > 102400000 bytes transferred in 15.936 secs (6425378 bytes/sec) > 102400000 bytes transferred in 16.173 secs (6331465 bytes/sec) > 102400000 bytes transferred in 16.004 secs (6398081 bytes/sec) > > Writing speed is still the same.
This won't help writing speed but it would be very interesting to know if it does anything to help with the freezes. >> Are you sure about reading being slow? That speed seems about right >> for write-cache being disabled on the volume. >> >> > http://old.nabble.com/Re%3A-HP-DL140-G3%2C-mpi%284%29-SAS1068-%28hotplug%29%2 > C-slow-disk-writes.-p17059402.html This (i.e. running the raid vendor's tool under linux and enabling write-cache for the array) might help writing speed.
