Red Hat Enterprise Linux & System z: How Red Hat uses System z

A presentation at System z Summer Series at Marist College in June 2008 in Poughkeepsie, NY, USA by Shawn Wells

Red Hat Enterprise Linux & System z Shawn Wells (swells@redhat.com) Solutions Architect, System z

Agenda System z Use Case: Red Hat  What RedHat uses our z9s for  What it’s allowed us to do RHEL for System z  What’s in it now  What our goals are 3

System z Use Case: How Red Hat Uses Z  IBM zSeries 2094 (z9)  IBM zSeries 2084 (z990)  Shark storage (ESS unit 2105, 16 full drawers of disk)  Provided via FCP layer emulation  Fully loaded z10 comes July ‘08 4

System z Use Case: How Red Hat Uses Z  Training (internal/external)  Development VMs  s390utils, kernel, integrating DeveloperWorks, etc  Quality Engineering  VM for each RHEL distro released since RHEL 4 (4.0, 4.1….. 5.1)  Support Desk  Emulating user problems 5

System z Use Case: How Red Hat Uses Z  JBoss Development (dev, test, prod)  Red Hat Network Development (dev, test, prod)  Enterprise IPA Development (dev, test, prod)  Cross compilation of all RHEL architectures  Staff accounts (sandbox environments, demos) 6

Fedora for System z 7

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System z Use Case: How Red Hat Z  Red Hat Network for deployment of new VMs, patching  Managed by one staff member Allows patching, reprovision z/VM guests, etc 11

System z Use Case: How Red Hat Z  RHN for Z: Lesson Learned  When configuring the kickstart through the web interface, choose Static IP instead of DHCP.  In the Extra Kernel Parameters text box, enter the information normally found in the CMS CONF file. Single line! DASD=100 HOSTNAME=example IPADDR=192.168.5.100 … Documented at: http://kbase.redhat.com/faq/FAQ_49_12902.shtm 12

RHN Satellite Is Now Open Source http://spacewalk.redhat.com  Announced at Red Hat Summit 2008  …. remember the Fedora -> RHEL model? 13

What’s new in RHEL5?  Upstream DASD driver updates (RHEL 5.1)  Upstream zFCP driver updates (RHEL 5.1)  Crypto2 Express support  CEX2C, CEX2A models  DCSS: Discontinuous Saved Memory Segment  Shared section of memory shared by several guests  Allows XIP2 (Execution in place)  XIP2fs integrated into ext2  Faster minidisk access on 64-bit VMs  Diag 250; CP performs actual I/O operations  SCSI (zFCP) multipath supported in the installer  Support for vmhalt= kernel parameter to communicate with z/VM on shutdown 14

Results of IBM/RedHat Joint Engineering RHEL 5.1  Improved z/VM scheduling  Improved RAS features  Improved performance with key recompiled libraries RHEL 5.2  Support for new IBM z10  Improved IBM Director support to support fast connection to z/VM  Improved Virtual Server Management  Implementation of SCSI dump infrastructure  Support for Dynamic CHPID reconfiguration  Better network configuration tool support for System z network adapters  Improved install experience with support for “ssh -X” with VNC  Better network performance with skb scatter-gather support  Implemented device-multipath support for xDR/GDPS 15

Results of IBM/RedHat Joint Engineering  Hipersocket MAC layer routing support  Implementation of layer 2 routing support, matching OSA MAC layer capability  Ability to route through intermediate VSWITCH for L2 briding to external networks  Enablement of IPv6 and L2 networks over hipersockets  STSI change for capacity provisioning  Hardware exploitation of new STSI instruction  Permanent and temporary capacity provided in /proc/sysinfo  Upstreamed support for OSA 2 ports per CHPID  Support for new OSA 2-port feature, occupying single I/O slot  Each port independently configured as CHPID type OSD or OSN 16

Thank You Shawn Wells Solutions Architect, Global Linux on System z Lead Email: Phone: swells@redhat.com 443-534-0130 http://redhat.com/z 17

Open Discussion

Supplimental Info

What is Red Hat Network? A systems management platform designed to provide complete life cycle management of the operating system and its applications Hosted Update Manage Satellite Provision Monitor 20

RHN Satellite Deployment Model RHN Hosted ● ● Software Distribution Subscription Management RHN Satellite • Software Distribution • Account Management • Channel Management • Monitoring • Provisioning WEB INTERFACE RHN Proxy API LAYER MANAGED SYSTEMS IT Applications      Custom Content Enterprise management solution – enhanced control Local database stores all packages, profiles, and system information Syncs content from RHN Hosted Custom content distribution Can run disconnected from the Internet 21

Useful Links  Technical mailing list (linux-390@vm.marist.edu)  Subscribe: http://www2.marist.edu/htbin/wlvindex?linux-390  Archive: http://www.mail-archive.com/linux-390@vm.marist.edu/  RHEL 5 Virtualization Cookbook  http://www.linuxvm.org/present/misc/virt-cookbook-RH5.pdf  Update to 5.2 coming soon (currently under technical review)  Presentations from SHARE user conferences and other links  http://www.linuxvm.org/present/  http://www.linuxvm.org/ 22

RHEL 5.2 Bug Fixes, Installer Related  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=237508 [Private]  Summary: LCS device not found at install  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=305331 [Private]  Summary: sudo-1.6.8p12-10 segfaults when using ldap on s390  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=354661 [Private]  Summary: multipath paths fail using PAV Devices on DS8000 DS6000  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=279201 [Private]  Summary: zfcpconf.sh fails in rc.sysinit if / partition and /usr partition are separated 23

RHEL 5.2 Bug Fixes, Storage Related  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=360701 [Private]  Summary: swap_dup: Bad swap file entry <xxxxxxxx> without swap configured  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=360611 [Private]  Summary: FICON DS8000: File ID Miscompare after CHPID off via HMC 24

RHEL 5.2 Bug Fixes, I/O Related  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=360821 [Private]  Summary: qdio: too many interrupts on qdio-driven devices  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=360631 [Private]  Summary: qdio: time calculation is wrong  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=354801 [Private]  Summary: cio: Disable channel path measurements on shutdown/reboot  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=354831 [Private]  Summary: cio: Handle invalid subchannel set id in stsch  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=354821 [Private]  Summary: cio: Device status validity 25

RHEL 5.2 Bug Fixes, Networking Related  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=281241 [Private]  Summary: tcpdump does not show outgoing packets with fake_ll=1  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=354891 [Private]  Summary: qeth: recognize/handle RC=19 from Hydra 3 OSA  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=354851 [Private]  Summary: qeth: increment sequence number for incoming packets  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=267381 [Private]  Summary: QDIO based network connections hang with QIOASSIST ON 26

RHEL 5.2 Bug Fixes, Stability Related, p1  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=360591 [Private]  Summary: Operating System Message: Kernel panic - not syncing: Fatal exception in interrupt  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=253275 [Private]  Summary: Placing a kprobe on ‘bc’ instruction can crash the system  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=354811 [Private]  Summary: I/O stall, system crash due to scanning for units from FC transport class  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=354871 [Private]  Summary: qdio: System hang with zfcp in case of adapter problems 27

RHEL 5.2 Bug Fixes, Stability Related, p2  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=350861 [Private]  Summary: Kernel panic with lcs interface as dhcp server  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=330211 [Private]  Summary: qeth: crash during reboot after failing online setting  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=380981 [Private]  Summary: Kernel Panic during activation of OSA-devices with fake_ll  BZ: https://bugzilla.redhat.com/show_bug.cgi?id=325451  Summary: ptrace compatibility problem with PTRACE_{PEEK,POKE}USR_AREA 28

Shawn Wells
@shawndwells

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Invited to the System z Summer Series at Marist College to share and discuss how Red Hat uses System z infrastructure internally. Spoke about Red Hat’s usage of an IBM zSeries 2094 (z9), zSeries 2084 (z990), and Shark storage, and how those systems contribute to the development of Enterprise Linux.