My 2 cents worth. (Actual exchange rate will vary) Using TSM's method of data storage we have about 3 bytes of data on tape for every byte on a server. When we used a traditional backup method, we had almost 9 bytes of data on tape for every byte on a server. The available dates to recover to are about the same. We realized a real savings in media.
Moving from a weekly full to the always incremental allowed us to have fewer tape drives to complete the same work. Our full backups required nearly 24 hours to complete, we no longer have to plan for a large weekend run. Doing a restore with a traditional backup method means you restore a full backup then up to 6 incremental backups, this can result in the same file being written 7 times. TSM will restore each object only once. If TSM is properly used this can save a great deal of time during the restore, if it is not properly setup it can cost a great deal of time due to tape mount waits. The downside is we no longer have 9 copies of an object on tape, we only have two, so in theory the odds of losing an object due to bad tapes is larger, but it is still a number starting with a dot and some zeros. Andy Huebner -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Bernaldo de Quiros, Iban 1 Sent: Friday, July 14, 2006 5:42 AM To: ADSM-L@VM.MARIST.EDU Subject: [ADSM-L] Advantages of having backup by versioning... Hi everyone there !! Could someone explain me the principal advantages of having the backup organised by versions...¿? Is it really an advantage to others backup softwares such as Veritas or Legato ¿? Thanks In Advance, Regards, Iban Bernaldo De Quiros Y Marquez Technical Specialist Sun Microsystems, Inc. Serrano Galvache, 56 Madrid 28033 ES Phone +34 91 767 6233 Mobile + 34 659 01 91 12 Email [EMAIL PROTECTED] -----Mensaje original----- De: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] En nombre de Yiannakis Vakis Enviado el: viernes, 14 de julio de 2006 12:16 Para: ADSM-L@VM.MARIST.EDU Asunto: [ADSM-L] Retention of backup versions I'm sure this question has been asked many times but I want to be sure what is going on: A mgnt class has been defined so that 5 versions of a file are kept, with a retention of 30 days. A file that is changed daily is backed up for 5 consecutive days. The next backup is taken 3 months later. What happens to the inactive files? Thanks Yiannakis Yiannakis Vakis Storage and Database Administration Systems Support Group, I.T.Division Tel. +357-22-848523 Mob. +357-99-414788 Fax. +357-22-337770 This e-mail (including any attachments) is confidential and may be legally privileged. If you are not an intended recipient or an authorized representative of an intended recipient, you are prohibited from using, copying or distributing the information in this e-mail or its attachments. If you have received this e-mail in error, please notify the sender immediately by return e-mail and delete all copies of this message and any attachments. Thank you.
