Glen,
Thank you for this further clarification. I have a follow-up question, if I
may.
I have a device/file that I am storing through a program that uses the API.
The size of this device that will be saved is 150GB. In my disk pool I only
have 55GB, but my next storage pool is tape which has 1TB. The max one tape
will hold is 70GB. If I understand you correctly this one file (which is
one device to me) can span tapes and will be saved appropriately. It will
not fail and thus I am limited by the size of my storage pool(s) and not any
one volume. If I get it, I am thrilled!!
So, do I get it?? :)
Thanks!
Gail
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of
Glen Smith
Sent: Thursday, December 21, 2000 3:14 PM
To: [EMAIL PROTECTED]
Subject: Re: individual file size > 2 GB - voulme groups
Hmmm, from what I recall...
* A given file cannot span aggregates.
* A file larger than the aggregate limit (which is typically the transaction
max limit) won't be aggregated.
* TSM (and ADSM) provides the concept of "unlimited" storage. TSM can handle
any size file and is limited only by the underlying filesystem and available
storage space. (you can't store 100TB if you only have 1TB of space)
* Aggregates (a collection of files) and un-aggregated files can (and do!)
span volumes if there isn't enough space on the initial volume.
So, your example below isn't quite correct. A 15GB file (which is larger
than the aggregate limit) would NOT be aggregated. And, that file would use
one and a half 10GB volumes (for the drive in the example).
TSM will not store "fragments" of a file. If the file you're trying to
store is larger than any pool's available space, the operation will fail.
Glen Smith
------Original Message------
From: Keith Davey <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Sent: December 21, 2000 8:00:52 AM GMT
Subject: Re: individual file size > 2 GB - voulme groups
Well I think an individule file needs to be contained with in an agragate.
Therefore the max size file TSM server could handel would be the max
addressable size of a single agragate. I am not certain what that size
limit is. However that does rase an interesting scenario. We know that
an agragate can not span across multipal physical volumes. So say you
have an 10 GB 4mm device, and the file you are backing up is 15GB. That
would make it impossable for that file to be backed up because the media
is unable to contain the whole agragated transfer. Of cource this is
shooting off the hip hypothisis, and I could be completly mistaken.
Keith Davey
On Wed, 20 Dec 2000, sekar n wrote:
> Hi KD ,
> thanks. It now looks that the maximum file size which
> tsm can could handle would be limited only by the
> individual volume size! . I believe it could be
> endlessly increased if the volume happens to be a disk
> under volume management of AIX or any such product.
>
> sekar narasimhan
>
> --- Keith Davey <[EMAIL PROTECTED]> wrote:
> > To the best of my knowlege TSM does not have a 2GB
> > file size limit for
> > storing the file. The problem comes in at the OS
> > filesystemlevel.
> > Solaris UFS filesystems have this limitation, as did
> > AIX 4.1. 4.2 could
> > be set up to support large file sizes in SMIT, and I
> > beleve 4.3 supports
> > it nativly. Linux also has this problem.
> >
> > If the individual file exceeds the MAX file size
> > that can be sent to a
> > storage pool, it is automaticly sent directly to its
> > next storage pool
> > (usualy tape). If a client is backing up directly
> > to tape, and the end of
> > file mark is reached prior to the end of the
> > agragate transfer, then that
> > agragate is expired, and a new tape is mounted. AKA
> > an Agragate can not
> > be split between two volumes.
> >
> > Keith Davey
> > Tivoli Systems
> >
> >
> > On Wed, 20 Dec 2000, sekar n wrote:
> >
> > > Hi all,
> > > Iam aware of some limitations on AIX/solaris for
> > > individual filesize > 2 GB. What about TSM. Also
> > what
> > > happens when an individual file size exceeds the
> > > physcial limit of pool volume. Does any
> > fragmentation
> > > take place !!
> > >
> > > sekar narasimhan
> > > Chennai, India
> > > mail: [EMAIL PROTECTED]
> > >
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