Thats right. Eventually, given time, to do a full system restore, we have to mount basically all the tapes. So a full system restore is a pain.
TSM was built on the concept that we mainly back it up. Restore must be reliable, but speed of restore is not the primary goal. <longwinded analogy> I explained the way that data gets on all the tapes spread pretty evenly with an analogy for some bosses before. Imagine you have a large number of buckets with marbles. (Yes, bucket is a tape, marble is a file.) The color of the marbles you get from each client are different, so you can tell where they came from. You fill buckets with marbles, but every day with marbles from the clients (some of each color marble in each buckets), and a few marbles are removed from the buckets (expiration) in a fairly uniform manner (a handfull from each bucket, of various colors). Since some buckets get pretty empty, and you want to reuse the bucket, you pour the content of the most empty bucket in to the new bucket you are filling today. Now the bucket you empty can be reused. Do this for a while. Then look at the distribution of marbles in the buckets that contain the marbles. You will find a fairly normal distribution, even if you fill a bucket with only one color (initial backup) initially. If you are going to try this, make sure and use different sizes of marbles too! </longwinded analogy> -----Original Message----- From: Karel Bos [mailto:[EMAIL PROTECTED] Sent: Tuesday, November 18, 2003 10:31 AM To: [EMAIL PROTECTED] Subject: Re: Backup User profiles Just let the back-ups run over time to a non-collecated storage pool with quiet a lot of clients and you will see. It will spread over all the tapes in a storage pool. Regard, Karel (Seen on LTO1 tapes) -----Oorspronkelijk bericht----- Van: Otto Schakenbos [mailto:[EMAIL PROTECTED] Verzonden: dinsdag 18 november 2003 17:22 Aan: [EMAIL PROTECTED] Onderwerp: Re: Backup User profiles How can 20Gb be spread over a lot of tapes? If your tapes are really that small consider a hardware upgrade. an option to consider is image backup (when you have bigger tapes) this will not help you with single file restores but in case of total disaster it will be time saver (and job maybe). one scenario could be do a image backup every week or so to tape do normal inc to a disk-library.(device class disk) so no long search and mount times. (also not so secure maybe but thats why you have you image backup on offsite tape) Remember that (to my knowledge but not sure have to look it up) you can't get single files back from an image backup so you need both. regards Otto Schakenbos PC-Support TEL: +49-7151/502 8468 FAX: +49-7151/502 8489 MOBILE: +49-172/7102715 E-MAIL: [EMAIL PROTECTED] TFX IT-Service AG Fronackerstrasse 33-35 71332 Waiblingen GERMANY Thomas Rupp, Vorarlberger Illwerke AG wrote: >Hi TSM-ers, > >How do you backup your server based Windows user profiles? > >I have to backup a W2K server with a 160GB disk where the Windows XP >User profiles are stored >- about 1.5 million files and 20GB. >These files have spread over a lot of tapes - a restore of a user >profile just took 4 hours due to >mount wait and tape positioning time. >Node Collocation is enabled - filespace collocation wouldn't help as >this node has only one filespace. > >I will give Richard Sims suggestion on how to create a VIRTUALMOUNTPOINT >on Windows a try. >Or has anyone else found a way how to backup and restore user profiles >efficiently? > >Client: 5.1.5 on Microsoft W2K cluster >Server: 4.2.2.8 > >Kind regards and greetings from Austria >Thomas Rupp >Vorarlberger Illwerke AG > > >
