On Tue, Jan 25, 2005 at 03:56:00PM -0700, Andrew Raibeck wrote:
file, here is allocation map. My understanding is that during restore,
TSM analyzes the data for lengthy patterns of zeroes in the data stream,
and that is how MAKESPARSEFILE works; but TSM does not do that analysis
[mailto:[EMAIL PROTECTED] On Behalf Of
Jurjen Oskam
Sent: Wednesday, January 26, 2005 8:30 AM
To: ADSM-L@VM.MARIST.EDU
Subject: Re: unix sparse file backup?
On Tue, Jan 25, 2005 at 03:56:00PM -0700, Andrew Raibeck wrote:
file, here is allocation map. My understanding is that during
restore,
TSM
Nice test.
I tried it on a linux box and got the same results.
I wanted to see if there is perhaps a difference in
the backup/restore time and transfer rates.
But both files take the same amount of time to backup or
restore and transfer rates are also the same.
You don't even have to use the
On Jan 26, 2005, at 5:46 AM, Warren, Matthew (Retail) wrote:
I seem to remember someone posting a link on the list that included
information on the hows and whys of reading/re-creating sparse files
and algorithms to do so. I just had a quick search but couldn't spot
it...
Hi, Matt -
Maybe not the
With Unix, I think it is difficult to determine during backup whether the
file is sparse or not, since there aren't any flags that say I'm a sparse
file, here is allocation map. My understanding is that during restore,
TSM analyzes the data for lengthy patterns of zeroes in the data stream,
and
TSM 5.1.9.0 on windows 2K server.
We have a new Fedora Core 3 64-bit client, which has a /var/log/lastlog
sparse file on it, which is 1.2TB, yet only 112K in real blocks used. TSM
is trying to backup the entire 1.2TB file, which is causing some backup
problems.
I've never had this issue before so
The TSM server is not actively aware of a file's attributes. The
sparseness of the file is determined at restore time, after the data has
been uncompressed, but before it is written to the disk.
Regards,
Andy
Andy Raibeck
IBM Software Group
Tivoli Storage Manager Client Development
Internal
Okay I'm with you so far, but will TSM server be able to tag a file as
a sparse file even if the client is compressing the file before it
sends it to TSM? Or does the client mark it as a sparse file. Otherwise
how would makesparsefile know to restore the file as a sparse file?
Thanks!
Alex
On Tue,
