"Will there be a impact to mainframe backup when there is a high backup volume for open system ?"
I am employed by the Texas CPA where such a solution was implemented. We never experienced any problems with contention. First, our z/OS mainframe necessarily had its own MTree file structure on the Data Domain, so there was no contention at the file level. The mainframe activity at this installation is characterized by a couple of bursts of activity each week while the open systems activity is more distributed through out the week, so the performance of the Data Domain has never been challenged. NB: The DLm emulates a manual tape library. An IBM TS7000 is an automatic library. NB: The TS7000 is capable of communicating directly with an IBM DS8000-class storage frame. The DLm is not. Two caveats: (1) The TS7000 communicates with z/OS tape management software. The DLm does not. This complicates tape management. (2) If you are contemplating the achival of mainframe data on cloud storage using IBM's Cloud Tape Connector (CTC) solution, the DLm will not be able to do this. It will also complicate implementation of IBM's Transparent Cloud Tiering (TCT). I don't believe you can find someone more knowledgeable about of Data Domain/DLm implementations than Carl Swanson. -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Carl Swanson Sent: Thursday, March 4, 2021 8:18 AM To: [email protected] Subject: Re: EMC DLM over IBM VTL CAUTION: This email originated from outside of the Texas Comptroller's email system. DO NOT click links or open attachments unless you expect them from the sender and know the content is safe. First full disclosure I work for Dell Technologies but more specifically in the DLm group, now with that out of the way. Probably more than 50% of the DLm customers do share their backend (Data Domain) storage with the distributed world and or the IBM-I world. What this means is we have experiences in sizing these types of solutions. When we perform this sizing, we will do a study on the mainframe the distributed side and the IBM I if required. We then make sure that the performance characteristics of the back end storage array is capable of handling the peak workload without issue. From the DLm point of view this is the connection to the mainframe and we size the performance requirements based on the supplied RMF data . I can provide much more detail if you like just not sure if it is appropriate to do so on list. Below is my non work email, but most could probably figure out my work email. Final answer this is a common for DLm systems and works great the key is proper sizing which my group handles. Carl Swanson Mobile:215.688.1459 Email: [email protected] -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Jake Anderson Sent: Thursday, March 4, 2021 1:16 AM To: [email protected] Subject: EMC DLM over IBM VTL Hello We are analysing if EMC DLM would be a right fit to replace IBM VTL. I am trying to understand about backup cycles using EMC DLM when we use single backup solution and single virtual tape library to backup both mainframe and open systems. Is there a possibility for contention ? Will there be a impact to mainframe backup when there is a high backup volume for open system ? These performance do effect the open system as well ? Trying to understand these from the DLM users ? Any feedback would be appreciated Jake. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
