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Re: Retroscpect Help

At 3:15 PM -0500 1/29/03, Chip Scheide wrote:
>But here's my big question, when you're down to bare metal, how you
gonna run CCC? You can't.
*IF* the server is down to "bare metal"

ther are far more serious problems than a simple backup /restore is going
to solve.

With tools like psync and rsync it's easy to restore a volume even when rebooting from the OS X installer CDs in single user mode.

>> >>Then in theory - if the server OS drive fails, I can in minutes, be up
and running and can defer the repair until a non peak time.
yes - MINUTES!!!!!!!!
the CCC drive is bootable -
reset the boot the disk - restart the machine = running server

You said you were restoring the drive. All that does is boot off the device.

>It takes about an hour or two to copy a drive. Look at the data
sizes, look at the poor transfer rates of firewire/IDE drives, and do
some quick math. .
theory - having never timed a Firewrie drive -
400mbps = ~50MB/sec

Yeah, but the drive doesn't write at 400MB/sec, it doesn't even read that
fast.
-----------
"forwarded" from: Craig Kabis
who responded to me directly

Why not just use psync or rsync. It's easier to script and cron.
while not gettign into the GUI vs CLI issue - again
CLI #*&ing sucks - I will not use i unles there is no other way -

with CCC there is NO scripting nor croning required - the app does all
this and is self contained
Using CCC you are using psync and cron. I have an Xserve with 3 HD.

I was under the impression CCC was using ditto. This could be false, but it does require a GUI to operate.

HD 1 is the OS
HD 2 is the FTP server storage
HD 3 is a mirror of HD 1

I have CCC backup to it every night. I had a problem last week were
NetInfo got wacked. I shut off the Xserve. Remove HD 1 and 3 and
switched them. Turned back on the Xserve and it booted backup. It
took all of about 30 seconds.

The same is true for any cloned disk that is bootable. However CCC can not create drives that are bootable on all OS X Macs. Some require XCOFFs and CCC's bootable option doesn't address this.

"Forwarded" from: Lee Collings
who also responded to me directly

After using psync for the past 3 months I am quite pleased with the way
it works for my 60g HD to 60g Firewire drive.

Your timings for the Firewire appear quite accurate but one point you
may have missed when thinking about this approach is initial backup vs.
ongoing backups.

The first time I ran psync to handle my entire 60gig hd it took about
12 minutes. However, since psync looks for changes to the file system
my nightly backups perform in under 5 minutes. Pretty good compared to
my old SGI tape system that took over an hour for every incremental
nightly backup to tape.

Tapes also have slower data rates than disks. Tapes also score in many respects over disks. They are less fragile and can be easily archived and have low cost per megabyte and high shelf lives.
--

-dhan
via email@hidden

------------------------------------------------------------------------
Dan Shoop 127 East Prospect Street
Consulting Internet Architect Waldwick, NJ 07463
email@hidden

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"Sadly, text alone cannot convey the depths of my sarcasm."
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