Re: Help with zLinux DASD using multiple paths
On Mon, Feb 23, 2009 at 03:41:03PM -0500, David K. Kelly wrote: Thank you David and Ron for the quick responses. Let me explain what I'm trying to do. In zLinux I have a DB2 file system that is setup on one large 3390-27 disk pack. And when I use Linux tools like iostat I see one disk with one path to the Shark. What I would like to do is use the eight paths to this single disk (yes, I would like multiple exposures to the disks). How do I do that? Or maybe I already have this configured or CP is doing it but I can not tell this with my limited Linux commands? We do have Velocity and I can see lots of IO going through. Also we don't used PAV and from what I understand that is more of a zOS thing and we are a zVM shop. Let me explain it from the Linux point of view. For each disk linux sees it can submit one request at a time. Linux has no knowledge how this disk is connected to the storage system. So to submit more than one request at a time to the same disk there is only the possibility with PAV. If you can replace the one disk with set of smaller disks (rule: the more the better), this will boost the I/O. IBM published on http://www.ibm.com/developerworks/linux/linux390/perf/tuning_rec_dasd.html on how to set up storage configuration for good performance. The performance of a PAV with N paths and a striped volume with N disks is comparable. Ihno Thank you David K. David Boyes dbo...@sinenomin e.net To Sent by: Linux on LINUX-390@VM.MARIST.EDU 390 Port cc linux-...@vm.mar IST.EDU Subject Re: Help with zLinux DASD using multiple paths 02/23/2009 11:19 AM Please respond to Linux on 390 Port linux-...@vm.mar IST.EDU On 2/23/09 11:12 AM, David K. Kelly dkke...@courts.state.va.us wrote: How can I configure multiple paths to a single disk in SUSE zLinux? I have 8 paths to our Shark and I¹m running zLinux SUSE 10 in zVM V5.3 on a z9 and I want to configure multiple paths to a single 22.8 GB 3390-27 disk. Just to be sure, do you want the Linux guest to see multiple exposures to the disk? If so, you need the PAV microcode to do that. If you just want it to exploit the physical paths, give the disk to CP as a user volume, allocate the disk as a minidisk in the Linux directory entry, and let CP worry about it. If the paths are in your IOCP, CP will automagically use them. -- 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 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 -- Best regards/Mit freundlichen Grüßen Ihno Krumreich Never trust a computer you can lift. -- Ihno Krumreich i...@suse.de Projectmanager S/390 zSeries Maxfeldstr. 5 +49-911-74053-439 D-90409 Nürnberg http://www.suse.de SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg) -- 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
Re: Help with zLinux DASD using multiple paths
On Sat, Feb 28, 2009 at 2:34 PM, Ihno Krumreich i...@suse.de wrote: So to submit more than one request at a time to the same disk there is only the possibility with PAV. Would it not be the multi-path feature in Linux that allows Linux to see multiple exposures and an I/O outstanding to each exposure. PAV is what you need on LPAR to do this. With z/VM you can give the virtual machine multiple links to the same mini disk to simulate this. Whether that makes sense from a performance point of view depends on your configuration. With MDC in the picture, you can show cases where this works well. I have not been able to measure a configuration where z/VM uses PAV to back this. I have seen quite a few where it really made no sense at all. Rob -- Rob van der Heij Velocity Software http://www.velocitysoftware.com/ -- 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
SLES initial installation on IBM z890
Hello listers, I´m trying to install SLES 10.1 in a LPAR / z890. During the system loading from HMC CD-ROM I get: Could not find the SUSE Linux Enterprise Server 10 Installation Source. Anyone has some information on this? Is it a distribution error? Thks Helio Mario -- 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
Re: SLES initial installation on IBM z890
On 2/28/2009 at 4:05 PM, Helio Mario Neves Pimentel de Oliveira h...@engepel.com.br wrote: Hello listers, I*m trying to install SLES 10.1 in a LPAR / z890. During the system loading from HMC CD-ROM I get: Could not find the SUSE Linux Enterprise Server 10 Installation Source. Anyone has some information on this? Is it a distribution error? No. For System z the DVD reader is only usable to IPL the LPAR. It cannot be accessed by the Linux operating system to finish the install. You will need a network installation server. If you have z/VM, we have a pre-built installation server that you can download and restore to disk. 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
RES: SLES initial installation on IBM z890
Thks Mark, First a correction: I´m working on the SLES 10 - S390 SP2. No, I don´t have z/VM. So, should I go through TAPE? PS. I´m new in this environment (Linux/Z) Helio Mario Belo Horizonte BRASIL -Mensagem original- De: Linux on 390 Port [mailto:linux-...@vm.marist.edu] Em nome de Mark Post Enviada em: sábado, 28 de fevereiro de 2009 18:02 Para: LINUX-390@VM.MARIST.EDU Assunto: Re: SLES initial installation on IBM z890 On 2/28/2009 at 4:05 PM, Helio Mario Neves Pimentel de Oliveira h...@engepel.com.br wrote: Hello listers, I*m trying to install SLES 10.1 in a LPAR / z890. During the system loading from HMC CD-ROM I get: Could not find the SUSE Linux Enterprise Server 10 Installation Source. Anyone has some information on this? Is it a distribution error? No. For System z the DVD reader is only usable to IPL the LPAR. It cannot be accessed by the Linux operating system to finish the install. You will need a network installation server. If you have z/VM, we have a pre-built installation server that you can download and restore to disk. 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 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
Can anybody explain this?
I am trying to add space to a file system. The lvextend to add space worked OK but the resize2fs tells me there is not enough space? [r...@lssb1 ~]# lvextend -l +130 /dev/VolGroup00/LogVol06 Extending logical volume LogVol06 to 9.78 GB Logical volume LogVol06 successfully resized [r...@lssb1 ~]# resize2fs -p /dev/mapper/VolGroup00-LogVol06 resize2fs 1.39 (29-May-2006) Filesystem at /dev/mapper/VolGroup00-LogVol06 is mounted on /opt; on-line resizing required Performing an on-line resize of /dev/mapper/VolGroup00-LogVol06 to 2564096 (4k) blocks. resize2fs: No space left on device While trying to add group #1 Bobby Bauer Center for Information Technology National Institutes of Health Bethesda, MD 20892-5628 301-594-7474 -- 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
Re: RES: SLES initial installation on IBM z890
On 2/28/2009 at 4:17 PM, Helio Mario Neves Pimentel de Oliveira h...@engepel.com.br wrote: Thks Mark, First a correction: I*m working on the SLES 10 - S390 SP2. No, I don*t have z/VM. So, should I go through TAPE? No, not tape. You will need to have a network installation server. That means, you will need to have a server, somewhere in your internal network, that serves up the installation media via HTTP, FTP, or NFS. It is preferable that this server be Linux or UNIX, not Windows. This implies that you will need a working TCP/IP connection, on the needed port(s), from your mainframe to the installation server. See http://linuxvm.org/Present/SHARE111/S9233mp.pdf for other things to consider. 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
RES: RES: SLES initial installation on IBM z890
Ok, I´ll track this way (tomorrow). It´s strange all the documentation present CD-ROM TAPE options. Thank you very much again. Good night Helio Mario -Mensagem original- De: Linux on 390 Port [mailto:linux-...@vm.marist.edu] Em nome de Mark Post Enviada em: sábado, 28 de fevereiro de 2009 18:24 Para: LINUX-390@VM.MARIST.EDU Assunto: Re: RES: SLES initial installation on IBM z890 On 2/28/2009 at 4:17 PM, Helio Mario Neves Pimentel de Oliveira h...@engepel.com.br wrote: Thks Mark, First a correction: I*m working on the SLES 10 - S390 SP2. No, I don*t have z/VM. So, should I go through TAPE? No, not tape. You will need to have a network installation server. That means, you will need to have a server, somewhere in your internal network, that serves up the installation media via HTTP, FTP, or NFS. It is preferable that this server be Linux or UNIX, not Windows. This implies that you will need a working TCP/IP connection, on the needed port(s), from your mainframe to the installation server. See http://linuxvm.org/Present/SHARE111/S9233mp.pdf for other things to consider. 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 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
Re: Can anybody explain this?
On 2/28/2009 at 4:32 PM, Bauer, Bobby (NIH/CIT) [E] baue...@mail.nih.gov wrote: I am trying to add space to a file system. The lvextend to add space worked OK but the resize2fs tells me there is not enough space? [r...@lssb1 ~]# lvextend -l +130 /dev/VolGroup00/LogVol06 Did you really intend to only add 130 _bytes_ to the LV? 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
Re: RES: RES: SLES initial installation on IBM z890
On 2/28/2009 at 5:06 PM, Helio Mario Neves Pimentel de Oliveira h...@engepel.com.br wrote: Ok, I*ll track this way (tomorrow). It*s strange all the documentation present CD-ROM TAPE options. Thank you very much again. That's correct, but that only gets you to the point of activating the network so that you can access the rest of the installation files. 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
Re: neat? bash stuff that I didn't know.
On Fri, 27 Feb 2009, John Summerfield wrote:
will establish a TCP connection to ${PORT} on ${HOST}. Replace
/dev/tcp/... with /dev/udp/... and it will do udp instead of tcp. This
redirects stdout. Of course, using instead of will redirect stdin and
do a read. So, if you like netcat to send some data ala
command | nc ${HOST} ${PORT}
you can use the above redirection instead and
command /dev/tcp/${HOST}/${PORT}
instead of
nc -l ${HOST} ${PORT} | command
NBD - but it saves forking a process.
but how does one carry on a sensible conversation? I can send stuff to
sendmail, but how do I get its responses?
You can't. It is like netcat - communications is unidirectional. I guess
if the far end sends something back over the socket, it is quietly
dropped. Netcat has the same problem. It either sends or receives, but not
both. What you'd like would be more like a bidirectional pipe, if there
were such a thing. IIRC, pipes in UNIX are unidirectional. So
bidirectional communications requires two pipes. Something like that might
be possible using this, but I can't really think of how. That might be a
nice enhancement both for IP communications and piped communications.
Perhaps a symbol?
cmd1 cmd2
could possible cross connect stdout of cmd1 to stdin of cmd2 as well as
stdin of cmd1 to stdout of cmd2, allowing bidirectional communications.
Use of different fd number could be possible with:
cmd1 nm cmd2
where n and m are numbers so that /dev/fd/n of cmd1 talks to /dev/fd/m of
cmd2 and /dev/fd/m of cmd1 to /dev/fd/n of cmd2.
The above would be complicated if somebody naively did:
cmd1 | cmd2 cmd3 | cmd4
In any case, unidirectionality does decrease its utility somewhat. But I
doubt that any of us would say that piping output from one command to
another is useless because the second command cannot send anything back to
the first command. How do you get responses back from sendmail if you pipe
to it?
--
Q: What do theoretical physicists drink beer from?
A: Ein Stein.
Maranatha!
John McKown
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