Date: Fri, 22 Jan 1999 20:01:41 -0500 From: Mark Conway Wirt <mark@intrepid.net> To: freebsd-isp@FreeBSD.ORG Subject: Introduction/ccd(4) Question Message-ID: <19990122200141.A4461@intrepid.net>
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Hey Folks,
I run a mid-sized ISP in West Virginia/Maryland, and am looking at
migrating some of our services to FreeBSD. We're currently a Linux
shop, and I've heard nice things about the stability, performance, and
security of FreeBSD. [Incidentally, I'd love to hear from anyone who's
used both platforms to get your personal feelings -- feel free to
email me privately if you don't want to clutter the list with advocacy
messages.] I have two questions (I'll mail them in separate
messages).
First:
Traditionally, we've run -- shall we say -- "monolithic" servers, i.e.
$10,000, fully RAID-mirrored big servers for high availability. Of
course we'll continue to do so for mission critical applications like
mail, but I'm also considering putting together some mid-ranged
machines for other purposes. For example, we have some customers who
have expressed interest in on-line commerce, so I'd like to put a
dedicated https server together, but I can't justify spending big
bucks until I know that it can generate revenue.
Enter ccd. Granted if a disk fails you'll have some down-time as you
swap in new drives a rebuild the mirrors, but at least it's minimal
and you have much less chance of loosing data than say from restoring
from tape. I have a few questions about ccd though:
1) Are any of you ISP's using it, and it it stable?
2) I assume that the root partition can't be ccd. Correct? and
3) If a disk in a mirror set fails, does the ccd fail immediately,
or can you unmount the device and rebuild gracefully?
Sorry for being so long winded. I'll try to be more brief in the
future ;-)
--Mark
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