IBM AIX-AK FZK 2005 - Manuals

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation IBM Storage Support for Linux DS4000 Storage Servers Enterprise Storage Server Linear Tape Open Enterprise Tape Network Attached Storage Storage Virtualization

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation pLinux Support Disk  ESS: SLES8, SLES9, RH-EL 3  SDD available  JS20, p5 and OP: SLES9, RH-EL 3  Remote boot supported  DS6000, DS8000: SLES8, SLES9, RH-EL 3  SDD available  JS20: SLES8, SLES9, RH-EL 3  p5 and OP: RH-EL 3 only  Remote...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation pLinux Support Tape  LTO: SLES 8, SLES 9, RH-EL 3  Data Path (for 3584) and Media Changer failover supported  359x: SLES 8, SLES 9, RH-EL 3  Data path failover supported for 3592  Parallel SCSI attachment also supported  Advanced  IBMta...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation The Linux SCSI Subsystem  What is supported  The Linux SCSI subsystem  Linux Kernel version 2.6  Multipathing scenarios  Tape specifics

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Linux Device Addressing brw-rw---- 1 root disk 8, 0 2003-03-14 14:07 /dev/sda brw-rw---- 1 root disk 8, 1 2003-03-14 14:07 /dev/sda1 brw-rw---- 1 root disk 3, 0 2003-03-14 14:07 /dev/hda crw-rw---- 1 root disk 9, 0 2003-03-14 14:07 /dev/st0 cr...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Design SD disks block device (sd_mod.o) User Space Kernel Space SG pass-through char device (sg.o) ST tapes char device (st.o) SR cdrom/dvd block device (sr_mod.o) SCSI unifying layer (scsi_mod.o, scsi*.[hc], hosts.[hc], constants.c) SCSI / FC...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Linux Kernel Version 2.6  What is supported  The Linux SCSI subsystem  Linux Kernel version 2.6  Multipathing scenarios  Tape specifics

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Storage Changes in Linux Kernel 2.6  Increased number of SCSI devices  Persistent device names  Improved hotplugging  Native multipathing  LVM 2  Improved I/O performance  Larger devices and filesystems

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Wellknown Linux SCSI Limitations  Limited number of devices  Up to 256 SCSI disk devices  Up to 256 SCSI generic devices  Up to 32 tape drives  Gaps in LUN sequence  Limited “on-the-fly” attachment  Device re-ordering Fixed with Kernel ...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Other Problems and Pitfalls  Multiple LUN support of RH-EL  DS4000 Specific  QLogic failover driver configuration  Potential LUN thrashing  UTM (Access LUN)  ESS, DS6000, DS8000 Specific  SDD and LVM, ext3  Mounting PPRC targets  DS60...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Large filesystems support  Linux Kernel Limits  Max file size: 2 TB (2^41 bytes)  Max file system size: 8 ZB (2^73 bytes)

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Multipathing Scenarios  What is supported  The Linux SCSI subsystem  Linux Kernel version 2.6  Multipathing scenarios  Tape specifics

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Multipathing Concepts Linux host 1 HBA 0 Disk LUN 0 HBA 1 Linux host 2 HBA 0 HBA 1 DS4000 A B Linux host 1 HBA 0 Disk LUN 0 HBA 1 Linux host 2 HBA 0 HBA 1 1 2 Linux host 1 HBA 0 Disk LUN 0 HBA 1 Linux host 2 HBA 0 HBA 1 1 2 DS6000 DS8000

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation LUN Transfer to Alternate Controller  DS4000 transfers LUNs to alternate controller  Volumes are owned by one controller  Volumes can be accessed through both controllers  Volume ownership is always transferred to the controller that is us...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation LUN Thrashing Scenario Linux host 1 HBA 0 Disk LUN 0 HBA 1 Linux host 2 HBA 0 HBA 1 DS4000 A B

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Multipathing with RDAC  Must use QLogic non-failover driver  Always uses current path (as reported by DS4000)  RDAC installation  FC HBA driver must be installed and loaded  At least one LUN must be assigned and available  Must use Host ...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation RDAC Shared Data Scenario Linux host 1 HBA 0 Disk LUN 0 HBA 1 Linux host 2 HBA 0 HBA 1 DS4000 A B

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Preferred Path  DS6000 uses concept of preferred path  Volumes are owned by one controller  Volumes can be accessed through both controllers  Data is transferred to and from owning controller to requesting controller internally -> perfo...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Preferred Path Shared Data Scenario Linux host 1 HBA 0 Disk LUN 0 HBA 1 Linux host 2 HBA 0 HBA 1 1 2 DS6000

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Host Ports Independent of Controller  ESS and DS8000 have independent host ports  Volumes are owned by one controller  All host ports can communicate with both controllers  Dynamic load balancing across all ports possible

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Independent Host Port Shared Data Scenario Linux host 1 HBA 0 Disk LUN 0 HBA 1 Linux host 2 HBA 0 HBA 1 1 2 DS8000

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Tape Specifics  What is supported  The Linux SCSI subsystem  Linux Kernel version 2.6  Multipathing scenarios  Tape specifics

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation IBMtape driver  For download as binary rpm package  Kernel module IBMtape.o  Required to utilize all LTO capabilies  Manages medium changer failover  Provides new devices and ioctl  Daemon IBMtaped NDMC-7:/ # ls -l /dev/IBM* crw-rw-rw- 1...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation -------------------------- General Commands: ----------------------------- 1. Open a Device 7. Request Sense 2. Close a Device 8. Log Sense Page 3. Inquiry 9. Mode Sense Page 4. Test Unit Ready 10. Switch Tape/Changer Device 5. Reserve Device ...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Use LTO Devices  Native  tools: mt, mtx, IBMtapeutil  applications: cpio, tar, taper, afio  3 rd party applications  All major backup solutions available for Linux  Attention: some are only tested with parallel SCSI attachment  Check IS...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Native Library Management  Linux tool for media changers: mtx  Media changer is addressed through SCSI generic device mtx -f /dev/sg1 inquiry mtx -f /dev/sg2 status mtx -f /dev/sg2 load <slotnum> [ <drivenum> ] /dev/sg0 - interna...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Medium Changer Failover  Automatitcally moves robot control to another drive in case of a failure  Available for 2582, 3583, 3584  Enabled as an option for IBMtape driver  Check the /proc/scsi/IBMchanger file Linux host HBA SCSI / FC tape ...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Tape and Disk Connected to the Same HBA Linux host HBA 0 Disk LUN 0 HBA 1 Disk LUN 1 HBA 2 SCSI / FC tape SCSI / FC tape Robot Linux host HBA 0 Disk LUN 0 HBA 1 Disk LUN 1 SCSI / FC tape SCSI / FC tape Robot  Possible, but not recommended  U...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Questions & Discussion More Questions? What are your customers needs? Contact: [email protected]

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation LTO Resources  LTO Compatibility Information  LTO ISV Matrix http://www.storage.ibm.com/tape/lto/compatibility.html  LTO Downloads http://www.ibm.com/servers/storage/support/lto/ltodownloads.html ftp://ftp.software.ibm.com/storage/devdrvr/L...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation  Implementing Linux with IBM Disk Storage http://www.redbooks.ibm.com/redbooks/pdfs/sg246261.pdf  Linux with xSeries and FAStT: Essentials http://www.redbooks.ibm.com/redbooks/pdfs/sg247026.pdf  Implementing IBM LTO in Linux and Windows htt...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation White Papers  FAStT and Linux HowTo http://www.ibm.com/developerworks/eserver/articles/install_fibre/index.html  FAStT and RH AS Cluster http://www.ibm.com/servers/esdd/articles/redhat/index.html  ESS Attachment to United Linux 1 (IA-32) ht...

IBM Systems Group AIX-AK FZK 2005 © 2005 IBM Corporation Legal Notices Both Linux and Storage are rapidly changing environments. This information is presented "as is" without any warranty of any kind. Customers are responsible for determining the suitability to their respective environments....