Linux on 390 Port <[email protected]> wrote on 03/26/2007 04:52:17 PM:
> That's somewhat outdated information at least for SLES 9 & 10. > We have Linux I/O statistics for FCP/SCSI and shortly we'll have > FCP adapter I/O statistics, too. > > It is true that ECKD attached disks provide QoS features like > end-to-end data protection and is the dominant I/O attachment > for Linux. It is also true that customers would usually observe > higher throughput with FCP attached storage. > > More performance related data to disk I/O is available at > > http://www-128.ibm.com/developerworks/linux/linux390/perf/index.html > > and more specific information for related to the DS8000 at > > http://www-128.ibm. > com/developerworks/linux/linux390/perf/tuning_res_dasd_ds8000.html Even this info. is dated. There are considerable differences between the FCP firmware for Ficon Express 2 on Trex, and the firmware for Ficon Express 2 on Danu. > Best regards > Ingo > > > Linux on 390 Port <[email protected]> wrote on 26.03.2007 22:38:21: > > > When performance is bad, do you want to know why? Until we know how > > to show when the SAN > > is impacting your application and how - do you want to trust your > > production to something > > where performance is not manageable? > > For example, an ibm controller was benchmarked first as eckd, then > > as scsi. on eckd, we > > get cache stats - could show the dasd fast write filled up, and > > could show response time. > > for scsi, all we could show was thruput was degraded. we can't > > even measure silly > > response time numbers on scsi. > > > > > > Lionel B. Dyck wrote: > > > > > I've heard several good reasons to have my zlinux images use dasd that > is > > > on the fibre connected san and a few for using the old tried and true > > > dasd. What I'd like to find out is what is true and what isn't - > basically > > > what is considered the best practice for zlinux dasd. > > > > > > Thus - what do y'all think? > > > > > > Thanks in advance. > > > > > > Lionel B. Dyck, Consultant/Specialist zLinux Platform > > > Client and Platform Engineering Services (CAPES) > > > KP-IT Enterprise Engineering, Manager Toni Nicotera > > > 925-926-5332 (8-473-5332) | E-Mail: [EMAIL PROTECTED] > > > AIM: lbdyck | Yahoo IM: lbdyck > > > Kaiser Service Credo: "Our cause is health. Our passion is service. > We?re > > > here to make lives better.? > > > > > > ?Never attribute to malice what can be caused by miscommunication.? > > > > > > NOTICE TO RECIPIENT: If you are not the intended recipient of this > e-mail, > > > you are prohibited from sharing, copying, or otherwise using or > disclosing > > > its contents. If you have received this e-mail in error, please notify > the > > > sender immediately by reply e-mail and permanently delete this e-mail > and > > > any attachments without reading, forwarding or saving them. Thank you. > > > > > > ---------------------------------------------------------------------- > > For LINUX-390 subscribe / signoff / archive access instructions, > > send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or > visit > > http://www.marist.edu/htbin/wlvindex?LINUX-390 > > [attachment "barton.vcf" deleted by Ingo Adlung/Germany/IBM] Ray Higgs System z FCP Development Bld. 706, B24 2455 South Road Poughkeepsie, NY 12601 (845) 435-8666, T/L 295-8666 [EMAIL PROTECTED] ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
