Backup solutions have dropped dramatically in price. In today's world, you
can purchase a 525GB uncompressed library solution for less than $4,500.00.
We're talking AME based helical scan too.
AME helical scan has inherent traits which enable it to handle data transfer
over LANs more efficiently than DLT. Especially in non-streaming
environments. They also handle smaller files more efficiently - the issue
at stake here.
If you want something faster, go AME. Native uncompressed transfer rates
are 2x faster than the quickest DLT and overall more efficient and reliable.
I have some white papers if anyone is interested in them.
Steve
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf
Of Ben Mihailescu
Sent: Tuesday, December 05, 2000 10:13 AM
To: retro-talk
Subject: Re: How Long does this take for you?
Hi,
I'm totally with you here. My full backup takes about 30 hours on a
weekend. Fast and straight forward, no problem. After 15-20 days of
incremental backup to the same set, it is totally impossible to collect
all the clients in one night. I have posted at length about this before,
yet no real solution - other than spending a ton of money - has been
found. I gott'a say, Dantz should realize that disk space is so cheap and
easy to add this days, that backup software and hardware should start
matching the price and efficiency.
Ben
--
Ben Mihailescu
System Administrator
Electrical and Computer Engineering
McGill University, Montreal, Canada
514.398.7467
"Douglas B. McKay" wrote:
> Ben,
>
> I have found that Retrospect spends most of its time in my nightly
> backups processing files and catalogs, not actually backing up data.
> I have 15 clients which are backed up by Retrospect from a machine
> with 4 OnStream ADR 50 drives. The full backups on the weekend take
> about 26 hours (~120GB). Nightly backups take almost 12 hours
> (usually less than 5GB).
>
> Be careful about the half-million file limit. If you get around
> 500,000 files, Retrospect has a problem with memory and dies. Dantz
> knows about the issue and is working on ways to eliminate the memory
> problem (at least that's what I was told several months ago).
>
> Anyway, the bottom line is that what you are experiencing has been my
> experience as well (long periods "building" catalogs and things).
>
> It sure would be nice if my backup time could shrink and allow the
> file copying to take place at full speed, but perhaps have the catalog
> processing, etc. take place separately (perhaps on the client using
> its CPU! - my backups happen after hours).
>
> ...Doug
>
> Douglas B. McKay
> [EMAIL PROTECTED]
> Data Mgt Group
> http://www.datamgt.com
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On
> Behalf
> Of Ben Eastwood
> Sent: Monday, December 04, 2000 5:30 PM
> To: retro-talk
> Subject: Re: How Long does this take for you?
>
> More on this:
> Retrospect is still "building snapshot" and appears to be hogging
> about
> 95-99% CPU, but not stuck, really because it varies... I also notice
> that
> taskman reports memory usage of 86716K, which seems like a lot on a
> machine
> with 196 MB of RAM where the System takes up only 6364K... Any hints?
>
> Thanks
> --Ben
>
> "Ben Eastwood" <"Ben_Eastwood/HMG/Wilson_Learning/US"@wlcmail.com> on
> 12/04/2000 04:12:40 PM
>
> Please respond to "retro-talk" <[EMAIL PROTECTED]>
>
> To: [EMAIL PROTECTED]
> cc: (bcc: Ben Eastwood/HMG/Wilson Learning/US)
> Subject: How Long does this take for you?
>
> I have questions for y'all:
>
> When running a backup operation of a LOCAL disk (RAID 5 Array,
> actually)to
> a DLT7000 drive, I noticed that the Performance reported varied
> widely,
> from a high of 450MB/min to a low of 13 MB/min, and the "Time
> Remaining"
> would jump around pretty much based on this. Is that normal? The
> folder I
> backed up had over 36 GB in it, mostly little files. In fact there
> were
> over 300,000 files in about 10,000 folders, if that matters. Also the
> "Scanning" before the backup took a long time.
>
> The actual backup took about 6 hours, and then it went into "Updating
> catalog" for about 45 minutes and then on to "building snapshot,"
> where it
> is now. During these last two sections, it has said "time remaining
> 00:00:00," but it's not really done... and the progress bar is only
> about
> halfway across. Is that any real indication of how much time I have
> left?
>
> comments appreciated
>
> --ben
>
> --
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>
> For urgent issues, please contact Dantz technical support directly at
> [EMAIL PROTECTED] or 925.253.3050.
--
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