Author: me Date: To: Richard G. Duvall CC: David Sheryn, Tabor J. Wells, exim-users Subject: Re: [Exim] RAM in mail server
What pop server are you using.
Iqbal
Richard G. Duvall wrote: >
> I do have this sort of setup (where mail is being delivered to /var/mail
> for every user). I did split off the spool to a seperate drive, and that
> helped ALOT! I have root filesystem on same drive as /var/mail.
>
> I am thinking of doing the following configuration:
>
> 1 wide scsi drive for root filesystem
> 1 wide scsi drive for spool
> 2 wide scsi drives striped together, mirrored with 2 other drives which
> are striped together.
>
> Total of 6 wide scsi drives. spooling doesn't take that much room, but I
> need speed for spooling. But, most of my speed problems are taking place
> when people are checking mail, not sending, (unless they are sending to a
> user on our system, then it get's queued for later delivery, because it
> times out).
>
> This configuration will give us not only redundancy, but more speed
> because of the striping, and use of wide scsi, as opposed to narrow on the
> same drive as the root filesystem as we have it set up now.
>
> I didn't know about the hierarchy thing in UNIX. I will give that a try.
>
> Is there anybody on this mailing list that can confirm that this hierarchy
> thing does make a definite difference in speed on BSDI4.01?
>
> Sincerely,
>
> Richard G. Duvall
>
> On Thu, 19 Aug 1999, David Sheryn wrote:
>
> > On Wed, 18 Aug 1999, Tabor J. Wells wrote:
> >
> > [ ... ]
> >
> > > > My hard drive on my mail server is doing alot of access (slow seek time,
> > > > etc). I have 10,000 users on the 400Mhz Pentium II with 128MB ram. I am
> > > > wondering if my access is being slowed down by mail transfer, or from
> > > > swapping. how do I tell which?
> >
> > [ ... ]
> >
> > > Also I don't know how your disks are laid out, but I would strongly
> > > recommend putting I/O intensive directories (like your mail spool perhaps)
> > > and filesystems on their own disk.
> >
> > If you have a single /var/mail (or whatever) with 10,000 mailboxes in it, then
> > this may also be your problem. Unix directories don't scale well to this sort
> > of size. You may want to consider splitting the mailboxes accross a directory
> > hierarchy e.g. /var/mail/A/B/login where A and B are different for succesive
> > login names. Exim has a string expansion function, hash, which may be useful
> > for deriving these from the login name.
> >
> > Regards,
> >
> > DHS
> > -- David Sheryn <D.H.Sheryn@???> Postmaster, Computing Services
> > -- City University, Northampton Square, London, EC1V 0HB
> > -- Phone: (+44) 171 477 8000 Direct 0171 477 8196 Fax: 0171 477 8565
> >
> >
> >
> > --
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> >
>
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