Joseph, We have a fairly large, simple system. About 7 TB online out of 23 TB total from 120 active nodes. Includes almost 4 TB of Domino data.
We have been sending copy tapes offsite for about four years now. Its biggest benefit so far has been the recovery of 180,000 files from our main file servers that were on two LTO tapes that got eaten by our 3583. Like most users, our copypool tapes are not collocated, so my tape library had to read about 55 tapes to restore the two LTOs. Each restore took about two days. But so what? How long would it have taken to recreate 180,000 files, some several years old? As our TSM primary administrator, the loss of 180,000 user-created data files borders on incompetence. Tape libraries are not that expensive. We are a $180 million company. We have four tape libraries, with four drives each. We also have a two-drive library as an installed spare to the library that hosts our copypool. We send everything offsite on DLT 8000 media. Our two-drive, twenty-six slot SCSI DLT library cost all of $15,000 (HPaq brand). Other brands offer comparable libraries for about $10K. Media is about $60 / tape. Our DLT 8000 drives consistently write TSM data at 8-12 MB/s each. Such a library should be adequate unless your daily new data is in the TB range. Companies have gone out of business because of lost data. Is the saving of $10-20K so important that your management is willing to literally "bet the company" on it? Thanks, and good luck. Tab Trepagnier TSM Administrator Laitram, LLC |---------+----------------------------> | | "Wholey, Joseph | | | (IDS DM&DS)" | | | <[EMAIL PROTECTED]| | | .COM> | | | Sent by: "ADSM: | | | Dist Stor | | | Manager" | | | <[EMAIL PROTECTED]| | | .EDU> | | | | | | | | | 09/18/2003 12:05 | | | PM | | | Please respond to| | | "ADSM: Dist Stor | | | Manager" | | | | |---------+----------------------------> >---------------------------------------------------------------------------------------------------------------| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Saving data on a defective cartridge | >---------------------------------------------------------------------------------------------------------------| A "little" off the subject, and I already heard Richard Simms view on not having a second copy... but what are most shops doing with respect to a second copy. I'm in a pretty large shop and upper management, in a cost savings effort, wants us to turn off the creation of a second tape copy. I'm not too comfortable with the idea. What are "your" thoughts? -----Original Message----- From: Coats, Jack [mailto:[EMAIL PROTECTED] Sent: Thursday, September 18, 2003 12:38 PM To: [EMAIL PROTECTED] Subject: Re: Saving data on a defective cartridge <snip> Hello, I forgot to mention that because of lack of resources I can't afford a copypool for the backup files. I have one for the archives. Best regards Gerhard --- Gerhard Rentschler email:[EMAIL PROTECTED] Regional Computing Center tel. ++49/711/685 5806 University of Stuttgart fax: ++49/711/682357 Allmandring 30a D 70550 Stuttgart Germany > -----Original Message----- > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] Behalf Of > Juan Manuel Lopez Azanon > Sent: Thursday, September 18, 2003 6:02 PM > To: [EMAIL PROTECTED] > Subject: Re: Saving data on a defective cartridge > > > Disaster recovery management: Restore it from outside volumes from copy > stgpool >