On Thu, 27 Apr 2000, Corin Hartland-Swann wrote:
> I was hoping that RAID-1 would 'stripe' reads between the disks,
> increasing read performance to RAID-0 levels, but leaving write
> performance at single-disk levels. Does anyone know why it doesn't do
> this?
>
I think there is a patch for this, search the archive of this list.
> If RAID-1 doesn't 'stripe' the reads, then it seems that my best bet is
> going for RAID-5 over 4 disks. Does anyone have any comments and/or
> suggestions about doing this?
>
It depends on what you want to do with /. Since /var/log is also
located here and if you have big log files, I would make this also
a raid 5 partition. ftpd and httpd are doing lots of small writes
here, so raid1 will slow you down if its being used as a web or ftp
server.
Regardless of the raid level you choose, take a look at the man pages
of syslog.conf. Many distributions still sync every single write to
messages, warn, etc. If you prefix the logfiles with a minus "-"
syslogd will NOT sync the file for every entry. I have seen many
systems misconfigured in this way and after putting in the minus
they where much faster and responsive.
Holger
