Re: Linux/390 and z/VM interactions
I've tried the make, and the make fails with the compiler being missing. I don't know enough about this to 1) Identify the binary modues from that list, and 2) How to install them so I can make thigns work. ONE of these year they ARE going to send me to a unix/linux administration class so these planet sized holes in my knowledge base get filled... but I alas am unable to make the cognitive leap here. |-+ | | Mark Post| | | [EMAIL PROTECTED]| | | et | | | Sent by: Linux on| | | 390 Port | | | [EMAIL PROTECTED]| | | IST.EDU | | || | || | | 12/16/2002 04:10 | | | PM | | | Please respond to| | | Linux on 390 Port| | || |-+ --| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Linux/390 and z/VM interactions | --| Steve, I just downloaded the openssh.os390.gz file. The binary code is in there: -rwxr-xr-x 0/5000 5598 2001-08-28 14:16:23 testopenssh/install-sh -rw-r--r-- 0/5000 11422828 2001-08-28 15:42:50 testopenssh/libcrypto.a -rw-r--r-- 0/5000 736948 2001-08-28 14:21:56 testopenssh/libssh.a -rw-r--r-- 0/5000 3668080 2001-08-28 15:42:52 testopenssh/libssl.a -rw-r--r-- 0/500041446 2001-08-28 15:42:46 testopenssh/libRSAglue.a -rwxr-xr-x 0/5000 2437120 2001-08-28 14:36:45 testopenssh/ssh -rwxr-xr-x 0/5000 1642496 2001-08-28 14:47:03 testopenssh/ssh-add -rwxr-xr-x 0/5000 1409024 2001-08-28 14:47:21 testopenssh/ssh-agent -rwxr-xr-x 0/5000 1052 2001-08-28 14:16:28 testopenssh/ssh-askpass -rwxr-xr-x 0/5000 1638400 2001-08-28 14:47:12 testopenssh/ssh-keygen I would say give it a try. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED]]On Behalf Of James Melin Sent: Monday, December 16, 2002 1:06 PM To: [EMAIL PROTECTED] Subject: Re: Linux/390 and z/VM interactions We're in LPAR mode as well with Linux. Trying to cough up the $$$ for Z/VM also. The distribution of SSH that I tried was on http://s390.nichols.de/ssh/index.html. Page says the archive included binaries compiled under OS/390 2.9, but I sure as hell couldn't find them or figure out where they were in a different archive. If anyone is interested in trying to get Open SSH working under OS/390\Z/OS and unix system services with GCC or some other open source C compiler (if there is one) I think we could do something very beneficial to the OS/390 AND linux/390 Communities. Why IBM does not include open SSH as part of of the base is beyond me. |-+ | | paultz | | | [EMAIL PROTECTED]| | | Sent by: Linux on| | | 390 Port | | | [EMAIL PROTECTED]| | | IST.EDU | | || | || | | 12/16/2002 11:44 | | | AM | | | Please respond to| | | Linux on 390 Port| | || |-+ --- ---| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Linux/390 and z/VM interactions | --- ---| Jim, Yes, quiesce your Linux prior to doing your DFDSS backup of your CDL DASD. As to SSH, I assume you are referencing the SG245944 Redbook, chapter 25? I know it's out there, I just haven't gotten to it yet. I'm trying to find some free time to do similar automated tasks via SSH. I'll be interested to hear from you if you beat me to implementing SSH on your z/OS system (don't have z/VM). Best regards, Paul
Re: Linux/390 and z/VM interactions
Well, the web page did have an email address to send questions to the packager. You could try that. Or, you could take a Linux-Linux/390 package and see what files are relevant for installation and where they go: rpm -qlp openssh.rpm I just checked the one on my Slackware system here at home, and not counting all the man pages, etc., there are only about 15 files I would consider installable. My list probably won't reflect the same target directories, etc. that yours would, but if you like, I can send it to you off list. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED]]On Behalf Of James Melin Sent: Tuesday, December 17, 2002 8:56 AM To: [EMAIL PROTECTED] Subject: Re: Linux/390 and z/VM interactions I've tried the make, and the make fails with the compiler being missing. I don't know enough about this to 1) Identify the binary modues from that list, and 2) How to install them so I can make thigns work. ONE of these year they ARE going to send me to a unix/linux administration class so these planet sized holes in my knowledge base get filled... but I alas am unable to make the cognitive leap here. |-+ | | Mark Post| | | [EMAIL PROTECTED]| | | et | | | Sent by: Linux on| | | 390 Port | | | [EMAIL PROTECTED]| | | IST.EDU | | || | || | | 12/16/2002 04:10 | | | PM | | | Please respond to| | | Linux on 390 Port| | || |-+ --- ---| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Linux/390 and z/VM interactions | --- ---| Steve, I just downloaded the openssh.os390.gz file. The binary code is in there: -rwxr-xr-x 0/5000 5598 2001-08-28 14:16:23 testopenssh/install-sh -rw-r--r-- 0/5000 11422828 2001-08-28 15:42:50 testopenssh/libcrypto.a -rw-r--r-- 0/5000 736948 2001-08-28 14:21:56 testopenssh/libssh.a -rw-r--r-- 0/5000 3668080 2001-08-28 15:42:52 testopenssh/libssl.a -rw-r--r-- 0/500041446 2001-08-28 15:42:46 testopenssh/libRSAglue.a -rwxr-xr-x 0/5000 2437120 2001-08-28 14:36:45 testopenssh/ssh -rwxr-xr-x 0/5000 1642496 2001-08-28 14:47:03 testopenssh/ssh-add -rwxr-xr-x 0/5000 1409024 2001-08-28 14:47:21 testopenssh/ssh-agent -rwxr-xr-x 0/5000 1052 2001-08-28 14:16:28 testopenssh/ssh-askpass -rwxr-xr-x 0/5000 1638400 2001-08-28 14:47:12 testopenssh/ssh-keygen I would say give it a try. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED]]On Behalf Of James Melin Sent: Monday, December 16, 2002 1:06 PM To: [EMAIL PROTECTED] Subject: Re: Linux/390 and z/VM interactions We're in LPAR mode as well with Linux. Trying to cough up the $$$ for Z/VM also. The distribution of SSH that I tried was on http://s390.nichols.de/ssh/index.html. Page says the archive included binaries compiled under OS/390 2.9, but I sure as hell couldn't find them or figure out where they were in a different archive. If anyone is interested in trying to get Open SSH working under OS/390\Z/OS and unix system services with GCC or some other open source C compiler (if there is one) I think we could do something very beneficial to the OS/390 AND linux/390 Communities. Why IBM does not include open SSH as part of of the base is beyond me. |-+ | | paultz | | | [EMAIL PROTECTED]| | | Sent by: Linux on| | | 390 Port | | | [EMAIL PROTECTED]| | | IST.EDU | | || | || | | 12/16/2002 11:44 | | | AM | | | Please respond to| | | Linux on 390 Port| | || |-+ --- ---| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Linux/390 and z/VM interactions | --- ---| Jim, Yes, quiesce your Linux prior to doing your DFDSS backup of your CDL DASD
Re: Linux/390 and z/VM interactions
Sure. That would be faboo. And I did try the e-mail address on the page. Well over a month ago, to no avail |-+ | | Mark Post| | | [EMAIL PROTECTED]| | | et | | | Sent by: Linux on| | | 390 Port | | | [EMAIL PROTECTED]| | | IST.EDU | | || | || | | 12/17/2002 11:50 | | | AM | | | Please respond to| | | Linux on 390 Port| | || |-+ --| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Linux/390 and z/VM interactions | --| Well, the web page did have an email address to send questions to the packager. You could try that. Or, you could take a Linux-Linux/390 package and see what files are relevant for installation and where they go: rpm -qlp openssh.rpm I just checked the one on my Slackware system here at home, and not counting all the man pages, etc., there are only about 15 files I would consider installable. My list probably won't reflect the same target directories, etc. that yours would, but if you like, I can send it to you off list. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED]]On Behalf Of James Melin Sent: Tuesday, December 17, 2002 8:56 AM To: [EMAIL PROTECTED] Subject: Re: Linux/390 and z/VM interactions I've tried the make, and the make fails with the compiler being missing. I don't know enough about this to 1) Identify the binary modues from that list, and 2) How to install them so I can make thigns work. ONE of these year they ARE going to send me to a unix/linux administration class so these planet sized holes in my knowledge base get filled... but I alas am unable to make the cognitive leap here. |-+ | | Mark Post| | | [EMAIL PROTECTED]| | | et | | | Sent by: Linux on| | | 390 Port | | | [EMAIL PROTECTED]| | | IST.EDU | | || | || | | 12/16/2002 04:10 | | | PM | | | Please respond to| | | Linux on 390 Port| | || |-+ --- ---| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Linux/390 and z/VM interactions | --- ---| Steve, I just downloaded the openssh.os390.gz file. The binary code is in there: -rwxr-xr-x 0/5000 5598 2001-08-28 14:16:23 testopenssh/install-sh -rw-r--r-- 0/5000 11422828 2001-08-28 15:42:50 testopenssh/libcrypto.a -rw-r--r-- 0/5000 736948 2001-08-28 14:21:56 testopenssh/libssh.a -rw-r--r-- 0/5000 3668080 2001-08-28 15:42:52 testopenssh/libssl.a -rw-r--r-- 0/500041446 2001-08-28 15:42:46 testopenssh/libRSAglue.a -rwxr-xr-x 0/5000 2437120 2001-08-28 14:36:45 testopenssh/ssh -rwxr-xr-x 0/5000 1642496 2001-08-28 14:47:03 testopenssh/ssh-add -rwxr-xr-x 0/5000 1409024 2001-08-28 14:47:21 testopenssh/ssh-agent -rwxr-xr-x 0/5000 1052 2001-08-28 14:16:28 testopenssh/ssh-askpass -rwxr-xr-x 0/5000 1638400 2001-08-28 14:47:12 testopenssh/ssh-keygen I would say give it a try. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED]]On Behalf Of James Melin Sent: Monday, December 16, 2002 1:06 PM To: [EMAIL PROTECTED] Subject: Re: Linux/390 and z/VM interactions We're in LPAR mode as well with Linux. Trying to cough up the $$$ for Z/VM also. The distribution of SSH that I tried was on http://s390.nichols.de/ssh/index.html. Page says
Re: Linux/390 and z/VM interactions.
Just so I can wave a 'see, these people say it needs to be done this way' paper at my head sysprog I assume to use CDL and back up linux volumes with DFDSS 1) the volumes need to be 'avaiable' to the OS/390 image doing the backup, and that 2) Linux needs to be quiesced and halted in order to get a good backup of the devices? Lastly, has anoyne gotten Open SSH to work for OS/390? I'd like to use it to have automation be able to logon to Linux etc, and do stuff but I want encrypted shell. I've not been able to get the one S/390 port to work as we don't have the IBM C compiler. Has anyone ported GCC to the Unix side of OS/390 (Z/OS)? If so can the open SSH be made to work? Thanks. Have a happy monday. |-+ | | Rob van der Heij | | | [EMAIL PROTECTED] | | | Sent by: Linux on| | | 390 Port | | | [EMAIL PROTECTED]| | | IST.EDU | | || | || | | 12/13/2002 01:45 | | | PM | | | Please respond to| | | Linux on 390 Port| | || |-+ --| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Linux/390 and z/VM interactions. | --| At 15:42 13-12-02, McKown, John wrote: I know that I should use the code, Luke, but I'm not that familiar with the kernel et al. Does Linux/390 take advantage of any of the VM facilities when running under VM vs. in an LPAR? I'm thinking especially of the handshaking that is possible with paging. I.e. Linux thinks the page is in memory, but VM has it paged out. I think this is done with VSE and I remember it back in the OS/VS1 days as well. What about other VM-only facilities? Yes, pseudo page fault support is there already. When a process gets blocked because the particular page is paged out by VM, the kernel gets a chance to run another process. Recent changes to z/VM improved the PFAULT support. I have not seen numbers about how effective this is for Linux, but it is enabled by default when you run in a virtual machine. In fact, virtual memory itself as provided by z/VM is already a benefit over LPAR since it allows the Linux guests to breathe. The other thing is the shared kernel support that has been there for some time now. This allows you to put some 2MB of the kernel in shared pages and thus reduce the footprint of your penguins. And the dasd driver can use Diagnose I/O instead of SSCH and exploit MDC and other z/VM benefits. There have been some problems with that part of the driver in the past, but it looks like the current code works. Rob
Re: Linux/390 and z/VM interactions
Jim, Yes, quiesce your Linux prior to doing your DFDSS backup of your CDL DASD. As to SSH, I assume you are referencing the SG245944 Redbook, chapter 25? I know it's out there, I just haven't gotten to it yet. I'm trying to find some free time to do similar automated tasks via SSH. I'll be interested to hear from you if you beat me to implementing SSH on your z/OS system (don't have z/VM). Best regards, Paul From: James Melin Subject: Re: Linux/390 and z/VM interactions. Just so I can wave a 'see, these people say it needs to be done this way' paper at my head sysprog I assume to use CDL and back up linux volumes with DFDSS 1) the volumes need to be 'avaiable' to the OS/390 image doing the backup, and that 2) Linux needs to be quiesced and halted in order to get a good backup of the devices? Lastly, has anoyne gotten Open SSH to work for OS/390? I'd like to use it to have automation be able to logon to Linux etc, and do stuff but I want encrypted shell. I've not been able to get the one S/390 port to work as we don't have the IBM C compiler. Has anyone ported GCC to the Unix side of OS/390 (Z/OS)? If so can the open SSH be made to work? Thanks. Have a happy monday.
Re: Linux/390 and z/VM interactions
We're in LPAR mode as well with Linux. Trying to cough up the $$$ for Z/VM also. The distribution of SSH that I tried was on http://s390.nichols.de/ssh/index.html. Page says the archive included binaries compiled under OS/390 2.9, but I sure as hell couldn't find them or figure out where they were in a different archive. If anyone is interested in trying to get Open SSH working under OS/390\Z/OS and unix system services with GCC or some other open source C compiler (if there is one) I think we could do something very beneficial to the OS/390 AND linux/390 Communities. Why IBM does not include open SSH as part of of the base is beyond me. |-+ | | paultz | | | [EMAIL PROTECTED]| | | Sent by: Linux on| | | 390 Port | | | [EMAIL PROTECTED]| | | IST.EDU | | || | || | | 12/16/2002 11:44 | | | AM | | | Please respond to| | | Linux on 390 Port| | || |-+ --| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Linux/390 and z/VM interactions | --| Jim, Yes, quiesce your Linux prior to doing your DFDSS backup of your CDL DASD. As to SSH, I assume you are referencing the SG245944 Redbook, chapter 25? I know it's out there, I just haven't gotten to it yet. I'm trying to find some free time to do similar automated tasks via SSH. I'll be interested to hear from you if you beat me to implementing SSH on your z/OS system (don't have z/VM). Best regards, Paul From: James Melin Subject: Re: Linux/390 and z/VM interactions. Just so I can wave a 'see, these people say it needs to be done this way' paper at my head sysprog I assume to use CDL and back up linux volumes with DFDSS 1) the volumes need to be 'avaiable' to the OS/390 image doing the backup, and that 2) Linux needs to be quiesced and halted in order to get a good backup of the devices? Lastly, has anoyne gotten Open SSH to work for OS/390? I'd like to use it to have automation be able to logon to Linux etc, and do stuff but I want encrypted shell. I've not been able to get the one S/390 port to work as we don't have the IBM C compiler. Has anyone ported GCC to the Unix side of OS/390 (Z/OS)? If so can the open SSH be made to work? Thanks. Have a happy monday.
Re: Linux/390 and z/VM interactions
Steve, I just downloaded the openssh.os390.gz file. The binary code is in there: -rwxr-xr-x 0/5000 5598 2001-08-28 14:16:23 testopenssh/install-sh -rw-r--r-- 0/5000 11422828 2001-08-28 15:42:50 testopenssh/libcrypto.a -rw-r--r-- 0/5000 736948 2001-08-28 14:21:56 testopenssh/libssh.a -rw-r--r-- 0/5000 3668080 2001-08-28 15:42:52 testopenssh/libssl.a -rw-r--r-- 0/500041446 2001-08-28 15:42:46 testopenssh/libRSAglue.a -rwxr-xr-x 0/5000 2437120 2001-08-28 14:36:45 testopenssh/ssh -rwxr-xr-x 0/5000 1642496 2001-08-28 14:47:03 testopenssh/ssh-add -rwxr-xr-x 0/5000 1409024 2001-08-28 14:47:21 testopenssh/ssh-agent -rwxr-xr-x 0/5000 1052 2001-08-28 14:16:28 testopenssh/ssh-askpass -rwxr-xr-x 0/5000 1638400 2001-08-28 14:47:12 testopenssh/ssh-keygen I would say give it a try. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED]]On Behalf Of James Melin Sent: Monday, December 16, 2002 1:06 PM To: [EMAIL PROTECTED] Subject: Re: Linux/390 and z/VM interactions We're in LPAR mode as well with Linux. Trying to cough up the $$$ for Z/VM also. The distribution of SSH that I tried was on http://s390.nichols.de/ssh/index.html. Page says the archive included binaries compiled under OS/390 2.9, but I sure as hell couldn't find them or figure out where they were in a different archive. If anyone is interested in trying to get Open SSH working under OS/390\Z/OS and unix system services with GCC or some other open source C compiler (if there is one) I think we could do something very beneficial to the OS/390 AND linux/390 Communities. Why IBM does not include open SSH as part of of the base is beyond me. |-+ | | paultz | | | [EMAIL PROTECTED]| | | Sent by: Linux on| | | 390 Port | | | [EMAIL PROTECTED]| | | IST.EDU | | || | || | | 12/16/2002 11:44 | | | AM | | | Please respond to| | | Linux on 390 Port| | || |-+ --- ---| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Linux/390 and z/VM interactions | --- ---| Jim, Yes, quiesce your Linux prior to doing your DFDSS backup of your CDL DASD. As to SSH, I assume you are referencing the SG245944 Redbook, chapter 25? I know it's out there, I just haven't gotten to it yet. I'm trying to find some free time to do similar automated tasks via SSH. I'll be interested to hear from you if you beat me to implementing SSH on your z/OS system (don't have z/VM). Best regards, Paul From: James Melin Subject: Re: Linux/390 and z/VM interactions. Just so I can wave a 'see, these people say it needs to be done this way' paper at my head sysprog I assume to use CDL and back up linux volumes with DFDSS 1) the volumes need to be 'avaiable' to the OS/390 image doing the backup, and that 2) Linux needs to be quiesced and halted in order to get a good backup of the devices? Lastly, has anoyne gotten Open SSH to work for OS/390? I'd like to use it to have automation be able to logon to Linux etc, and do stuff but I want encrypted shell. I've not been able to get the one S/390 port to work as we don't have the IBM C compiler. Has anyone ported GCC to the Unix side of OS/390 (Z/OS)? If so can the open SSH be made to work? Thanks. Have a happy monday.
Re: Linux/390 and z/VM interactions
This is for USS under OS/390, not USS(OE) under z/VM. If the z/OS people are interested, more power to them. If the source code is in this, it might be we could get it to work under USS(OE) on z/VM. You don't need a parachute to skydive. You need a parachute to skydive twice. - motto of the Darwin Society. Gordon W.Wolfe, Ph.D. The Boeing Company (425)865-5940 -Original Message- From: Mark Post [mailto:[EMAIL PROTECTED]] Sent: Monday, December 16, 2002 2:11 PM To: [EMAIL PROTECTED] Subject: Re: Linux/390 and z/VM interactions Steve, I just downloaded the openssh.os390.gz file. The binary code is in there: -rwxr-xr-x 0/5000 5598 2001-08-28 14:16:23 testopenssh/install-sh -rw-r--r-- 0/5000 11422828 2001-08-28 15:42:50 testopenssh/libcrypto.a -rw-r--r-- 0/5000 736948 2001-08-28 14:21:56 testopenssh/libssh.a -rw-r--r-- 0/5000 3668080 2001-08-28 15:42:52 testopenssh/libssl.a -rw-r--r-- 0/500041446 2001-08-28 15:42:46 testopenssh/libRSAglue.a -rwxr-xr-x 0/5000 2437120 2001-08-28 14:36:45 testopenssh/ssh -rwxr-xr-x 0/5000 1642496 2001-08-28 14:47:03 testopenssh/ssh-add -rwxr-xr-x 0/5000 1409024 2001-08-28 14:47:21 testopenssh/ssh-agent -rwxr-xr-x 0/5000 1052 2001-08-28 14:16:28 testopenssh/ssh-askpass -rwxr-xr-x 0/5000 1638400 2001-08-28 14:47:12 testopenssh/ssh-keygen I would say give it a try. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED]]On Behalf Of James Melin Sent: Monday, December 16, 2002 1:06 PM To: [EMAIL PROTECTED] Subject: Re: Linux/390 and z/VM interactions We're in LPAR mode as well with Linux. Trying to cough up the $$$ for Z/VM also. The distribution of SSH that I tried was on http://s390.nichols.de/ssh/index.html. Page says the archive included binaries compiled under OS/390 2.9, but I sure as hell couldn't find them or figure out where they were in a different archive. If anyone is interested in trying to get Open SSH working under OS/390\Z/OS and unix system services with GCC or some other open source C compiler (if there is one) I think we could do something very beneficial to the OS/390 AND linux/390 Communities. Why IBM does not include open SSH as part of of the base is beyond me. |-+ | | paultz | | | [EMAIL PROTECTED]| | | Sent by: Linux on| | | 390 Port | | | [EMAIL PROTECTED]| | | IST.EDU | | || | || | | 12/16/2002 11:44 | | | AM | | | Please respond to| | | Linux on 390 Port| | || |-+ --- ---| | | | To: [EMAIL PROTECTED] | | cc: | | Subject: Re: Linux/390 and z/VM interactions | --- ---| Jim, Yes, quiesce your Linux prior to doing your DFDSS backup of your CDL DASD. As to SSH, I assume you are referencing the SG245944 Redbook, chapter 25? I know it's out there, I just haven't gotten to it yet. I'm trying to find some free time to do similar automated tasks via SSH. I'll be interested to hear from you if you beat me to implementing SSH on your z/OS system (don't have z/VM). Best regards, Paul From: James Melin Subject: Re: Linux/390 and z/VM interactions. Just so I can wave a 'see, these people say it needs to be done this way' paper at my head sysprog I assume to use CDL and back up linux volumes with DFDSS 1) the volumes need to be 'avaiable' to the OS/390 image doing the backup, and that 2) Linux needs to be quiesced and halted in order to get a good backup of the devices? Lastly, has anoyne gotten Open SSH to work for OS/390? I'd like to use it to have automation be able to logon to Linux etc, and do stuff but I want encrypted shell. I've not been able to get the one S/390 port to work as we don't have the IBM C compiler. Has anyone ported GCC to the Unix side of OS/390 (Z/OS)? If so can the open SSH be made to work? Thanks. Have a happy monday.
Re: Linux/390 and z/VM interactions.
John, Not yet, although there has been some discussion of how that might be implemented. The closest you can come right now is to define a vdisk as a paging device. If a page stays on the vdisk long enough, it will get put out to real VM paging volumes, otherwise it stays in expanded storage. A number of people (myself included) have played with this with good results. Mark Post -Original Message- From: Linux on 390 Port [mailto:[EMAIL PROTECTED]]On Behalf Of McKown, John Sent: Friday, December 13, 2002 9:42 AM To: [EMAIL PROTECTED] Subject: Linux/390 and z/VM interactions. I know that I should use the code, Luke, but I'm not that familiar with the kernel et al. Does Linux/390 take advantage of any of the VM facilities when running under VM vs. in an LPAR? I'm thinking especially of the handshaking that is possible with paging. I.e. Linux thinks the page is in memory, but VM has it paged out. I think this is done with VSE and I remember it back in the OS/VS1 days as well. What about other VM-only facilities? More curious than anything else. -- John McKown Senior Technical Specialist UICI Insurance Center Applications Solutions Team +1.817.255.3225
Re: Linux/390 and z/VM interactions.
Great! Thanks for the information. I'll be sure to mention it to our Linux administrator who is from the distributed side and has little or no mainframe experience. -- John McKown Senior Technical Specialist UICI Insurance Center Applications Solutions Team +1.817.255.3225 -Original Message- From: Rob van der Heij [mailto:[EMAIL PROTECTED]] Sent: Friday, December 13, 2002 1:45 PM To: [EMAIL PROTECTED] Subject: Re: Linux/390 and z/VM interactions. At 15:42 13-12-02, McKown, John wrote: I know that I should use the code, Luke, but I'm not that familiar with the kernel et al. Does Linux/390 take advantage of any of the VM facilities when running under VM vs. in an LPAR? I'm thinking especially of the handshaking that is possible with paging. I.e. Linux thinks the page is in memory, but VM has it paged out. I think this is done with VSE and I remember it back in the OS/VS1 days as well. What about other VM-only facilities? Yes, pseudo page fault support is there already. When a process gets blocked because the particular page is paged out by VM, the kernel gets a chance to run another process. Recent changes to z/VM improved the PFAULT support. I have not seen numbers about how effective this is for Linux, but it is enabled by default when you run in a virtual machine. In fact, virtual memory itself as provided by z/VM is already a benefit over LPAR since it allows the Linux guests to breathe. The other thing is the shared kernel support that has been there for some time now. This allows you to put some 2MB of the kernel in shared pages and thus reduce the footprint of your penguins. And the dasd driver can use Diagnose I/O instead of SSCH and exploit MDC and other z/VM benefits. There have been some problems with that part of the driver in the past, but it looks like the current code works. Rob
