Re: 2014-01-08 Linux on System z - Kernel 3.12 related updates on developerWorks
This is a multi-part MIME message. Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Gerhard: Regarding the zdsfs command, Its said Use the zdsfs command to mount a z/= OS DASD as Linux file system. and no more explanation. Do you know the adv= antage of this? Regards, Victor Echavarry System Programmer, EVERTEC LLC From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Gerha= rd Hiller Sent: Wednesday, March 19, 2014 8:24 AM To: LINUX-390@VM.MARIST.EDU Subject: 2014-01-08 Linux on System z - Kernel 3.12 related updates on deve= loperWorks Please refer to http://www.ibm.com/developerworks/linux/linux390/whatsnew.html for several updates to the 'Development stream': * description of upstream kernel 3.12 features that were contributed by Linux on System z development * kernel 3.12 patch for kernel message catalog * s390-tools 1.24.0 delivers new functionality and bugfixes * updated documentation -- Device Drivers, Features, and Commands (Kernel 3.12) SC33-8411-23 -- Using the Dump Tools (Kernel 3.12) - SC33-8412-13 -- Kernel Messages (Kernel 3.12) - SC34-2599-05 as well as updated Restrictions and Technical Details * end of message Mit freundlichen Gr=FC=DFen / Kind regards Gerhard Hiller see our TechOps homepage.http://w3.boeblingen.de.ibm.com/eserver_sw_develo= pment/TechOps Software Management and Linux Technologies IBM Systems Technology Group, Software Defined Systems [cid:image004.gif@01CF4354.763D0CA0] Phone: +49-7031-16-4388 IBM Deutschland [cid:image005.gif@01CF4354.763D0CA0] Fax: +49-7031-16-3545 Schoenaicher Str. 220 E-Mail: ghil...@de.ibm.com 71032 Boeblingen Germany [cid:image004.gif@01CF4354.763D0CA0] IBM Deutschland Research Development GmbH / Vorsitzende des Aufsichtsrats= : Martina Koederitz Gesch=E4ftsf=FChrung: Dirk Wittkopp Sitz der Gesellschaft: B=F6blingen / Registergericht: Amtsgericht Stuttgart= , HRB 243294 WARNING: This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please delete it immedi= ately. Please note that any views or opinions presented in this email are solely t= hose of the author and do not necessarily represent those of EVERTEC, Inc. or its affiliates. Finally, the integrity and security of this message cannot be guaranteed on the Internet, and as such EVERTEC, Inc. and its affiliates ac= cept no liability for any damage caused by any virus transmitted by this email. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ inline: image001.gifinline: image002.gifinline: image003.gifinline: image004.gifinline: image005.gifinline: image006.gif
Re: 2014-01-08 Linux on System z - Kernel 3.12 related updates on developerWorks
From the device driver manual: (The security warning is especially important) The zdsfs file system translates the z/OS data sets, which are stored on the DASDs in records of arbitrary or even variable size, into Linux semantics. Through the zdsfs file system, applications on Linux can read z/OS physical sequential data sets (PS) and partitioned data sets (PDS) on the DASD. In the Linux file system, physical sequential data sets are represented as files. Partitioned data sets are represented as directories, which contain the PDS members as files. Other z/OS data set formats, such as extended format data sets or VSAM data sets, are not supported. zdsfs is optimized for sequential read access. Attention: - To avoid data inconsistencies, set the DASDs offline in z/OS before you mount them in Linux. - Through the zdsfs file system, the whole DASDs are accessible to Linux, but the access is not controlled by z/OS auditing mechanisms. To avoid security problems, you might want to dedicate the z/OS DASDs only for providing data for Linux. Per default, only the Linux user who mounts the zdsfs file system has access to it. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: 2014-01-08 Linux on System z - Kernel 3.12 related updates on developerWorks
On Wednesday, 03/19/2014 at 09:36 EDT, Neale Ferguson ne...@sinenomine.net wrote: Attention: - To avoid data inconsistencies, set the DASDs offline in z/OS before you mount them in Linux. - Through the zdsfs file system, the whole DASDs are accessible to Linux, but the access is not controlled by z/OS auditing mechanisms. To avoid security problems, you might want to dedicate the z/OS DASDs only for providing data for Linux. In the same way a z/VM Linux guest can read CMS files, Linux can now read MVS data for all the same reasons. Nice if you want to keep some Linux configuration data on z/OS (particularly IP configs). If you do this, you should relegate the Linux data to datasets on a separate volume that is not used for automatic dataset allocation and that is not under SMS control. This prevents dataset migration since they will appear to never be used (except when you update them), and it avoids unaudited access to datasets that are not intended for access by the Linux server. If you have traditional z/OS data that you want to share with Linux, copy it to a dataset on that separate volume. As usual, when running Linux native in an LPAR, ensure that the LPAR has access only to the specific z/OS volumes that contain the Linux data. All of the expected cautions about writing to the datasets while Linux is trying to read them applies. Hence the suggestion for the volume to be offline to MVS since z/OS is unaware of the access. Alan Altmark Senior Managing z/VM and Linux Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: 2014-01-08 Linux on System z - Kernel 3.12 related updates on developerWorks
Thanks Neale: Victor Echavarry System Programmer, EVERTEC LLC -Original Message- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Neale Ferguson Sent: Wednesday, March 19, 2014 9:36 AM To: LINUX-390@VM.MARIST.EDU Subject: Re: 2014-01-08 Linux on System z - Kernel 3.12 related updates on developerWorks From the device driver manual: (The security warning is especially important) The zdsfs file system translates the z/OS data sets, which are stored on the DASDs in records of arbitrary or even variable size, into Linux semantics. Through the zdsfs file system, applications on Linux can read z/OS physical sequential data sets (PS) and partitioned data sets (PDS) on the DASD. In the Linux file system, physical sequential data sets are represented as files. Partitioned data sets are represented as directories, which contain the PDS members as files. Other z/OS data set formats, such as extended format data sets or VSAM data sets, are not supported. zdsfs is optimized for sequential read access. Attention: - To avoid data inconsistencies, set the DASDs offline in z/OS before you mount them in Linux. - Through the zdsfs file system, the whole DASDs are accessible to Linux, but the access is not controlled by z/OS auditing mechanisms. To avoid security problems, you might want to dedicate the z/OS DASDs only for providing data for Linux. Per default, only the Linux user who mounts the zdsfs file system has access to it. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/ WARNING: This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please delete it immediately. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of EVERTEC, Inc. or its affiliates. Finally, the integrity and security of this message cannot be guaranteed on the Internet, and as such EVERTEC, Inc. and its affiliates accept no liability for any damage caused by any virus transmitted by this email. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: 2014-01-08 Linux on System z - Kernel 3.12 related updates on developerWorks
Wow, there are more caveats than a viagra commercial. If you do this, you should relegate the Linux data to datasets on a separate volume that is not used for automatic dataset allocation and that is not under SMS control. This prevents dataset migration since they will appear to never be used (except when you update them), and it avoids unaudited access to datasets that are not intended for access by the Linux server. If you have traditional z/OS data that you want to share with Linux, copy it to a dataset on that separate volume. As usual, when running Linux native in an LPAR, ensure that the LPAR has access only to the specific z/OS volumes that contain the Linux data. All of the expected cautions about writing to the datasets while Linux is trying to read them applies. Hence the suggestion for the volume to be offline to MVS since z/OS is unaware of the access. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: 2014-01-08 Linux on System z - Kernel 3.12 related updates on developerWorks
On Wednesday, 03/19/2014 at 10:30 EDT, Neale Ferguson ne...@sinenomine.net wrote: Wow, there are more caveats than a viagra commercial. I suppose I should have warned that you should not use zdsfs if your auditors have high blood pressure as it may cause their heads to explode. Alan Altmark Senior Managing z/VM and Linux Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: 2014-01-08 Linux on System z - Kernel 3.12 related updates on developerWorks
On 19.03.2014 15:43, Alan Altmark wrote: On Wednesday, 03/19/2014 at 10:30 EDT, Neale Ferguson ne...@sinenomine.net wrote: Wow, there are more caveats than a viagra commercial. I suppose I should have warned that you should not use zdsfs if your auditors have high blood pressure as it may cause their heads to explode. While I agree that the list of restrictions is long, I think it is still fair to point out that once all necessary precautions are taken, zdsfs might provide an opportunity to transfer data from a z/OS instance to a Linux on System z instance faster (given sequential access) and with lower CPU overhead than traditional NFS or FTP transfer methods. Regards, Peter Oberparleiter -- Peter Oberparleiter Linux on System z Development - IBM Germany -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: 2014-01-08 Linux on System z - Kernel 3.12 related updates on developerWorks
Totally agree. It should prove very useful for big data type processing. Just need to write thing in large bold font in red to make sure people understand that practicing safe-sectors is required. On Mar 19, 2014, at 11:04 AM, Peter Oberparleiter wrote: On 19.03.2014 15:43, Alan Altmark wrote: On Wednesday, 03/19/2014 at 10:30 EDT, Neale Ferguson ne...@sinenomine.net wrote: Wow, there are more caveats than a viagra commercial. I suppose I should have warned that you should not use zdsfs if your auditors have high blood pressure as it may cause their heads to explode. While I agree that the list of restrictions is long, I think it is still fair to point out that once all necessary precautions are taken, zdsfs might provide an opportunity to transfer data from a z/OS instance to a Linux on System z instance faster (given sequential access) and with lower CPU overhead than traditional NFS or FTP transfer methods. -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
Re: 2014-01-08 Linux on System z - Kernel 3.12 related updates on developerWorks
On 3/19/2014 at 10:28 AM, Neale Ferguson ne...@sinenomine.net wrote: Wow, there are more caveats than a viagra commercial. And I think most, if not all of them, are going to go into the user confirmation message that will come up when someone tries to install the package on SLES. And probably some more. I was told that I couldn't package this as shootmeinthefoot.rpm, so I have to come up with a different name for it. Darn. Mark Post -- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 -- For more information on Linux on System z, visit http://wiki.linuxvm.org/
