1. You may find that with compression node perform worse - it may have no enough processor power and backup may take longer (or may not). System dependant, i.e. if the bottleneck is network compression may help. If processors are not enough powerful - backup with compression may take longer. 2. I disagree with Gerald. You can see "ANS1311E Server out of data storage space" when file does not compress (i.e. grows when compressed) and "compressalways yes" is set. OTOH if compressalways is set to "no" in such cases you will experience retries and performance will go down. 3. There is no real problems related to server. Only thing to have in mind is data is precompressed so tape drive cannot compress it further. You cannot expect DLT 8000 to hold more than 40 GB for example (80 GB is a marketing statement assuming 2:1 compression on drive)
Zlatko Krastev IT Consultant Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject: Re: compress setup question Adsm 3.1.2? ouch.. that's old and not even supported anymore.. Anyways I started with 3.7 so other then that descrepency... 1. There shouldn't be a problem although you should be aware that it will increase the load on all your servers as they'll now have to also compress the files when doing backups. I've seen this become an issue on servers that already experience a significant load. 2. The only time I've seen a "no space on server" type error in regards to compression is when you have caching enabled on your disk pools. So caching + compression would cause problems. But each without the other worked great. 3. again the only problem is that all clients now will experience an increased load due to having to compress the data. For most this isn't an issue but some environments may have a client or two that under normal operations experience quite a load already. Gerald Wichmann Sr. Systems Development Engineer Zantaz, Inc. 925.598.3099 w 408.836.9062 c -----Original Message----- From: Julie Xu [mailto:[EMAIL PROTECTED]] Sent: Thursday, May 02, 2002 8:31 PM To: [EMAIL PROTECTED] Subject: compress setup question Dear adsmer, we have setup our adsm server version 3.1.2 for all the client to compress depend no client. Compression: Client's Choice Our client do not want the choice and they want me to setup compress at server end. Before I do it, I would like to get advice about: 1. For WinNT servers, the force compress will cause problem at time of backup/restory? 2. The reason they do not like to make decision about compress is that some machine is ok to compress; some will get error as "no space on server". Can it be avoided by setup compress on server? 3. What is the petiential problem related adsm server setup force compress. Regards Julie Julie Xu Unix/Network Administrator Information Technology Directorate University of Westen Sydney, Campbelltown Campbelltown NSW 2560 Phone: 61 02 4620-3098 Mobile: 0416 179 868 Email: [EMAIL PROTECTED]
