Eliza, We are using 25 GB volumes right now without any issues but we are still collocateing by node. We are evaluting the savings of using smaller volumes when we move to noncollocated storage pools. I agree that it doesn't make sense to collocate file device class pools but managment wouldn't let us change that at first.
If you are talking about a Windows server then you need to think about file handles and their effect on the 256 MB of nonpagged memory. Also, the size of your MFT should be considered. Using more smaller files will have an effect on these things. I think as more and more of us implement these solutions we will have more collective knowledge from which to guide these decisions. Again, 25 GB volumes have been working well for us for nearly 8 months. We set our storage pools to relaim=30. We run expiration at 6:00 AM which starts a reclamation process soon after. We never have reclamation processes running past 8:30 AM. We have run many restores and have been extremely pleased with our speeds, much faster than tape for servers with many small files. "Rushforth, Tim" <[EMAIL PROTECTED]> wrote: Eliza: At the Disk only Backups Technical Exchange, IBM recommended 2-4 GB volume size. (This was stated by the presenter, it was not written on the PDF presentation.) We started with 25 GB volumes and have now switched to 4 GB volumes. Using smaller volume sizes allows a better utilization of space and increases restore performance with multi-session restore. (Also helps eliminate contention if multiple clients are restoring from the same volume) Tim Rushforth City of Winnipeg -----Original Message----- From: Eliza Lau [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 21, 2004 11:20 AM To: [EMAIL PROTECTED] Subject: Re: D2D on AIX Eric, What is the recommended volume size. I have seen someone mentioned 5G, but then the number of volumes will explode from about 800 (current # of 3590 primary tapes) to thousands. How about keeping the staging space so clients backup to staging then migrate to FILE volumes. Then every volume will be filled up. Eliza > > Hi Eliza! > You do want several smaller files, rather than a few very large files > because each client session will allocate a volume. File volumes cannot be > used concurrently by more than one session. > Kindest regards, > Eric van Loon > KLM Royal Dutch Airlines > > > -----Original Message----- > From: Eliza Lau [mailto:[EMAIL PROTECTED] > Sent: Monday, September 20, 2004 19:11 > To: [EMAIL PROTECTED] > Subject: D2D on AIX > > > Our 3494 with 3590K tapes in 3 frames is getting full. Instead of adding > another frame or upgrading to 3590H or 3592 tapes we are looking into > setting > up a bunch of cheap ATA disks as primary storage. > > The FILE devclass defines a directory as its destination and JFS2 > has a max file system size of 1TB. Does it mean the largest stgpool > I can define is 1TB? > > My Exchange stgpool alone has 8TB of data. Do I have to split it up > into 8 pieces? > > server: TSM 5.2.2.5 on AIX 5.2 > database 90GB at 70% > Total backup data - 22TB > > Eliza Lau > Virginia Tech Computing Center > [EMAIL PROTECTED] > > > ********************************************************************** > For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. > ********************************************************************** > --------------------------------- Do you Yahoo!? vote.yahoo.com - Register online to vote today!
