Re: EMC DASD Mirroring
Jim. Our site has been using SRDF/S between EMC DMX200 subsystems since 2004 using NORTEL OPTERA 5200 DWDM's. The OPTERA 5200's are using six 2gb links between our sites. The dark fibre links have a "ground distance" of 36km on the link we call the 'short route' and 39km on the link we call the 'long route'. EMC was very involved during the implementation of our SRDF/S process in 2004, so I'm a little surprised they couln't find us for you. Glenn Miller -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: EMC DASD Mirroring
>We plan to implement the DASD mirroring features of our EMC. Any tips or >gotchas we have to pay attention with. I knew it will definitely increase >the DASD disconnection time when we implement this. Anyway, I also wanted to >know what files you have decided not to be included with the DASD mirroring >that you knew will affect the batch performance? Temporary files? What >else? TIA. > 1. In a later e-mail you said it will be about 70km and you will be doing SRDF/S. When we looked at it for a site at 48km we asked EMC for any sites in the US (2005) doing around this or greater; none could be supplied. I strongly suggest you ask for reference sites to explore the consequences of running Synchronus at that distance. Oh yes, all the sites they gave us were well under 30km. 2. In a later e-mail you mention this is a cold-site used as backup. Since terminology is critical, hopefully you meant Disaster Recovery and not for backup purposes. Keep in mind if a file is mistakenly deleted "here", it is deleted "there"; thus no backup. Bottom line is our remote DR site is not a substitute for doing local backups although with enough bandwidth and equipment, doing the actual backups in the remote cold site is an interesting thought. 3. I would also recommend you consider SRDF/A although that is dependence on you toleration for data loss. If a matter of seconds is acceptable, then it is a lot less costly solution. I am not going to ask the obvious question of why remote DASD is sitting in a "Cold Site"; which means no computer is there. Although I was involved in a plan to have a separate DASD box located in a cave as a 3rd copy of the "stuff", so just in case the main site goes BOOM, DR site goes BOOM, and the plan was to rent a truck or maybe a SYSPROG's pickup truck, load up the DMX800 and drive it out west to recover the systems at a commercial DR site. Never got that far in the implementation. jim jim -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: EMC DASD Mirroring
Jason To wrote: Hi Radoslow, Thanks for the prompt reply. We plan to implement SRDF/S. Estimated about more or less 3-4TB of data and about 70km distance with 2 black fiber link. It will be a cold backup. 70km ? I would suggest asynchronous copy. Don't believe in available limits. The limits are feasible with significant impact on performance. Disclaimer: 70km is not yet the limit. BTW: 2 black fiber links means nothing except you probably have redundant links. It's likely you intend to use some DWDM device (optical multiplexer). So you should worry about number of SRDF links and link speed (2,4 Gbps). My $0.02 HTH Regards -- Radoslaw Skorupka Lodz, Poland -- BRE Bank SA ul. Senatorska 18 00-950 Warszawa www.brebank.pl Sd Rejonowy dla m. st. Warszawy XII Wydzia Gospodarczy Krajowego Rejestru Sdowego, nr rejestru przedsibiorców KRS 025237 NIP: 526-021-50-88 Wedug stanu na dzie 01.01.2008 r. kapita zakadowy BRE Banku SA wynosi 118.642.672 zote i zosta w caoci wpacony. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: EMC DASD Mirroring
Hi Radoslow, Thanks for the prompt reply. We plan to implement SRDF/S. Estimated about more or less 3-4TB of data and about 70km distance with 2 black fiber link. It will be a cold backup. Regards, Jason -Original Message- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of R.S. Sent: Wednesday, October 29, 2008 3:29 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: EMC DASD Mirroring Jason To wrote: > We plan to implement the DASD mirroring features of our EMC. Any tips or > gotchas we have to pay attention with. I knew it will definitely increase > the DASD disconnection time when we implement this. The devil is in details. What flavor of remote copy do you plan to use? SRDF/S ? SRDF/A ? Other ? What amount of data do you have? What links (speed, distance)? > Anyway, I also wanted to > know what files you have decided not to be included with the DASD mirroring > that you knew will affect the batch performance? Temporary files? What > else? TIA. It depends. For cold backup you can omit page's temorary files, and possibly couple datasets. -- Radoslaw Skorupka Lodz, Poland -- BRE Bank SA ul. Senatorska 18 00-950 Warszawa www.brebank.pl Sd Rejonowy dla m. st. Warszawy XII Wydzia Gospodarczy Krajowego Rejestru Sdowego, nr rejestru przedsibiorców KRS 025237 NIP: 526-021-50-88 Wedug stanu na dzie 01.01.2008 r. kapita zakadowy BRE Banku SA wynosi 118.642.672 zote i zosta w caoci wpacony. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: EMC DASD Mirroring
Jason To wrote: We plan to implement the DASD mirroring features of our EMC. Any tips or gotchas we have to pay attention with. I knew it will definitely increase the DASD disconnection time when we implement this. The devil is in details. What flavor of remote copy do you plan to use? SRDF/S ? SRDF/A ? Other ? What amount of data do you have? What links (speed, distance)? Anyway, I also wanted to know what files you have decided not to be included with the DASD mirroring that you knew will affect the batch performance? Temporary files? What else? TIA. It depends. For cold backup you can omit page's temorary files, and possibly couple datasets. -- Radoslaw Skorupka Lodz, Poland -- BRE Bank SA ul. Senatorska 18 00-950 Warszawa www.brebank.pl Sd Rejonowy dla m. st. Warszawy XII Wydzia Gospodarczy Krajowego Rejestru Sdowego, nr rejestru przedsibiorców KRS 025237 NIP: 526-021-50-88 Wedug stanu na dzie 01.01.2008 r. kapita zakadowy BRE Banku SA wynosi 118.642.672 zote i zosta w caoci wpacony. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
EMC DASD Mirroring
We plan to implement the DASD mirroring features of our EMC. Any tips or gotchas we have to pay attention with. I knew it will definitely increase the DASD disconnection time when we implement this. Anyway, I also wanted to know what files you have decided not to be included with the DASD mirroring that you knew will affect the batch performance? Temporary files? What else? TIA. Regards, Jason -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
