Hello
I have seen a term called IOPS in the technical sheet >From the storage perspective what does IOPS do? How does that influence on storage solution selection? On Thu, 5 Sept 2024, 16:03 Radoslaw Skorupka, < [email protected]> wrote: > Cache - the more the better. Obvious. However there are different ways > of use of DRAM as a cache. > Some vendors have cache mirrored. Others don't mirror READ cache. > Usually the same memory is used for other purposes, not only for caching > READs and WRITEs. So, "1TB of cache" is not simply comparable between > vendors. > > Disk module. SSD or magnetic? Usually SSD nowadays. But which SSD? There > are many flavours and capacities. > Usually smaller modules gives better overall performance. And better > flexibility. And there are faster and slower modules. > > Remote copy. > Do you want to perform PiT copy on secondary/slave? > Do you want asynchronous copy? > Do you want PPRC and FLASHCOPY command compatibility? > What QoS features of PiT and Remote Copy do you want? > etc. > > > -- > Radoslaw Skorupka > Lodz, Poland > > > > > W dniu 04.09.2024 o 20:27, Peter pisze: > > Thanks for the inputs > > > > Currently we are metro mirrored. > > > > So I believe I also need to look into their quality of support? > > > > Cache and modules? - what exactly I need to be researching on this ? > > > > On Wed, 4 Sept 2024, 19:40 Radoslaw Skorupka, < > > [email protected]> wrote: > > > >> W dniu 04.09.2024 o 10:52, Peter pisze: > >>> Hello, > >>> > >>> I Must confess that I am not a Storage expert. In our organization we > >> are > >>> working on procuring a new storage box solution. I have been asked to > >>> study and give an opinion on which solution would be perfect for our > >>> mainframe environment. > >>> > >>> Could someone give me your advise based on your experience. When > >> selecting > >>> a new storage solution what are the important points that needs to be > >>> looked into the vendors proposal ? > >> Generally speaking a DASD box is not just a bunch of disks. It is DASD > >> space + performance + embedded software. > >> > >> DASD space - obvious > >> > >> performance - a little bit more complex. There is no single number, like > >> car velocity. Even cache size should be understood, because vendors have > >> different way of use of it. Two approaches: compare "guts" (cache, disk > >> modules, etc.) or compare benchmarks. > >> > >> embedded software - remote copy, point in time copy, some "obvious" > >> things like SuperPAV, etc. Unless you have specific requirements all > >> vendors apply. However their offering differ and it could be important. > >> And features like Safeguarded copy. > >> > >> ...and zHyperlink. All vendors have FICON32 nowadays, and AFAIK all do > >> have zHyperlink. > >> > >> > >> HTH > >> > >> -- > >> Radoslaw Skorupka > >> Lodz, Poland > >> > >> > > ---------------------------------------------------------------------- > 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
