We had major problems backing up W2k large volumes -
130 GB took 4 days. However we patched up to 6.1.2 of
Legato, and this dropped signinficantly to 30 hours,
still not brilliant but better.
We addressed Legato as to why the version would fix
the issue, and the responded with the following :
?Customer?s main issue was with the length of time it
took to backup millions of small files on W2K, against
the results they were getting on NT. The first
solution suggestion we suggested was tuning patch for
6.1.1, as I understand it, this did not make a major
difference. It was then suggested that they upgrade to
6.1.2 and this gave the effect of reducing their
backup from 4 days down to 30 hours.
The two engineering developments within the 6.1.2
release that will have made the main difference to
this performance are:
1. DNS caching implementation
2. Client resource lookups now cached.
Both of these have made a major difference to
performance in this environment.
Ongoing, Legato is aware of the issue with backing up
millions of small files, in any environment. We are
continuing to investigate this through the use of
technologies such as snapshots, either within the
existing hardware environment or using our own
SnapImage technology. Such solutions will be made
available as they are supported or developed.?
Hope this helps,
It took us two months to sort out, so hopefully this
will save you some time.
Regards,
Dan Francis
AT & T Business Services.
--- Bokkelkamp Ernst <ernst.bokkelkamp AT SIEMENS DOT COM>
wrote: > First thing you should check that you DO NOT
have
> client side compression
> selected.
> It slows down the backup because the processor is
> too busy compressing and
> Legato will only display the actual (compressed)
> data rate it receives from
> the client. Because the drive can't compress it will
> always show a maximum
> of 5MB/sec.
>
> The better method to check the performance is to use
> the time to backup a
> certain amount of date. Backup programs are known to
> lie about the tape
> drive performance, although not always
> intentionally.
>
> Bye
> Ernie
>
> -----Original Message-----
> From: Tommy Henriksen
> [mailto:tommy_henriksen AT NORDDATA DOT DK]
> Sent: Friday, November 01, 2002 12:57 PM
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: [Networker] bad performance when backing
> W2K server's up, but
> not with netvaul !
>
>
> Hey,
>
> We have made som test on backing up a W2K server
> (with oracle) to a
> Networker running on Solaris. The client backup rate
> average is from
> 360KBytes/s to 887KBytes/s. The throughput seems to
> improve significantly
> when we are backing few large files up, the
> throughput raises to 5MBytes/s.
> The client is connected directly to the backup
> server via a switch.
>
> As a test, we tried backing up the same server with
> Netvaullt backup, the
> server was backed up 6,9G in 15 minutes with an
> average throughput of
> 7,5MBytes/s !
>
> Does anyone here have som experience in backing W2K
> server's with Networker,
> - what thorughput should we be expecting when
> backing a W2K server up ?
>
> Thanks.
>
>
>
>
> --
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