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Re: [K12OSN] hard drive SCSI vs IDE-opinions

cisna-barry wc235 k12 il us wrote:
This school year I set up,,our own mail server (
Postfix/Dovecot/Squirrelmail/amavisd/clamav),, [works like a charm].. and
now that we have all staff members using it,we are running into the
following scenario.
The three secretaries mass email out dailey announcements( about 350
users). So,, after they mass email it pulls down the email server for
almost 10 mins.to were it is unaccessable.So hence as soon as this
happens,,,phone rings>>"email is down yada,,yada".

I had a similar problem. Our environment is qmail, amavisd, ClamAV, Courier-IMAP, and IMP with nearly 700 users. The solution to the SMTP scanning slowdown was to leave qmail, amavisd and ClamAV on the existing server and install Courier-IMAP and IMP on a new server. Home directories are located on the new server for fast IMAP access and they are NFS mounted to the SMTP server so that it can make local deliveries.

The "illusion" that makes this work is that even if scanning is slow, people can still access their messages because they are using IMAP on a different server. The only slowness a user will see is message delivery won't be instantaneous during the mass mailings. (We've always used SCSI disks on mail servers, so I can't comment about speed increases by switching disks.)

What will I be up against if ( over xmas vacation)if  i merelry recable
the HD's to the SCSI interface/enable onboard SCSI, and reboot the box.

I'm not a hardware expert, but I'm pretty sure that SCSI disks and IDE disks have completely different interfaces. To attach a disk to a SCSI controller, you would need to purchase a SCSI disk - an IDE disk won't work.

Mike Lichtenwalner
Technology Specialist
Manheim Township School District
Lancaster, PA

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