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CASPUR SAN News

CASPUR SAN News. Andrei Maslennikov Orsay, April 2001. Will be discussed:. Goals Fabric Bridges Adding a new device to fabric Our devices Distributed Tapes Some plans. Goals. Ability to relocate devices et ease

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CASPUR SAN News

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  1. CASPUR SAN News Andrei Maslennikov Orsay, April 2001

  2. Will be discussed: • Goals • Fabric • Bridges • Adding a new device to fabric • Our devices • Distributed Tapes • Some plans A.Maslennikov - Orsay 2001

  3. Goals • Ability to relocate devices et ease • - Fibre Channel SAN allows for congestion-free, high-speed connectivity • with guaranteed delivery • - Since a device is attached to SAN, it may preserve it’s physical location • - Devices may be remotely reassigned from one host to another • - NB: we only want this for our very central and institutional services • Distributed Tape Drives • - Modern tape drives are rather expensive • - To get a good ROI drives should be shared at no loss of performance • Stay along with technology that has future • - Speeds will grow to 200 MB/sec and to 400 MB/sec • - Switches will become interconnectable over WAN • with ATM/STM Inteworking Units A.Maslennikov - Orsay 2001

  4. Fabric • Fabric • - We use Brocade switches 2400 and 2800 • - Currently 2x2400 and 2x2800, 48 ports in total • - Brocade Switch: • o supports practically all FC COSes and peripherals • o performant: up to 233 MB/sec • o runs a user-friendly Fabric OS and graphical interface • o whole SAN can be administered from any switch • o allows for zoning • o allows for redundant path • o duffused to such extent that device vendors consider • Brocade connectivity a must • - Only dim point - OS upgrades • o Switch reboot is required • o Way out: spare ports on other switches and scheduled shutdowns • o But this is true for any make of switch…. A.Maslennikov - Orsay 2001

  5. HBAs • Host-Based Adapters • - We tried Emulex Light Pulse 8000 and Qlogic QLA2200 • - Both models are fully supported on Solaris, AIX, Linux, Wxx • - We however have discarded QLA2200 at the initial stage, as we • observed inteferences between two Solaris hosts connected • to the fabric with this HBA and sharing a tape drive: Host 2 Host 1 Tape Disk1 Disk2 • Brocade zone 1 Brocade zone 2 • In this case, a job on host 1 was running a heavy test I/O job on disk 1. • And reboot of host 2 resulted in a SCSI timeout error on host 1/disk 1. • - In case of LP8000, this inteference was not seen. So we “jumped the Emulex • train” and use them since on all our hosts. We will also be trying QLA2200 • again soon, as their driver was long corrected. A.Maslennikov - Orsay 2001

  6. Bridges • Bridges • - We use 2 Crossroads StorageRouters 4200 to connect SCSI STK 9840 and DLT7000 • tape drives to the fabric • - 4200 Features: • o supports 2 SCSI buses (diff or single-ended) with up to 15 devices on each • o GBIC slot • o automatic configuration • - Problem observed: • o We were able to smoothly share DLT over Crossroads box 1 between 6 hosts • o 9840 on Crossroads box 2 was shareable up to 3 hosts. Adding host 4 meant • to jeopardize access to tape on all 4 machines… (tape off-line). • o Crossroads was blaming Emulex and vice versa • o Solution: two boxes had different firmware. Older firmware worked, newer -not A.Maslennikov - Orsay 2001

  7. New device, step-by-step • - Make sure the fabric login occured • - Find out the device WWNN / WWPN • - Create a device alias (nickname) • - Create/modify zones • normally create one new zone for each HBA (give it an alias!) • populate each zone with one HBA and disk and tape aliases • do not put a disk device into two different zones, unless you • know what you are doing • no limitations for tapes - share them! • - Set up the persistent bindings in the HBA driver configuration file • - Create new devices (vary with OS) A.Maslennikov - Orsay 2001

  8. Our current devices • Hosts • - 5 IBM AIX 4.3.3 ML8 (native and IBM-modified LP8000s) • - 6 Solaris 7+/8+ (native LP8000s) • Disks • - 3 Artecon Lynx II arrays (single ctl) • - 2 DotHill 4200 arrays (dual AA) - via 2 Gadzoox Bitstrip TW Hubs • - 1 DotHill 7100 (dual AA) • - 1 IBM 2102 (2 ctl) • - Around 4 TB in total • Tapes • - 1 STK 9480 • - 1 DLT 7000 via Crossroads • - 4 LTO on native FC • - All tapes are shared A.Maslennikov - Orsay 2001

  9. 3584 FC Library Distributed Tapes LTOs 9740 STK Library S A N scsi 9840 4200 bridge DLT (5) Access Tape 9740 Mount comands via serial line 3584 mount commands via FC Tape Mounter Tape Dispatcher < (3) Mount command (6) Free Tape > hosts (2) Lock wait Mount request / Free tape via LAN < (4) Mount rc (1) Mount request > A.Maslennikov - Orsay 2001

  10. Some plans • - Bring tapes to Linux DB hosts (backup) • try both LP8000 and QLA2200 on RedHat • - Try small (logical) slices of RAID-5 and RAID-0 • non-shared scratch areas • faster cache areas for AFS on front-end hosts (AIX and Tru64) • system disks? • - GPFS tests on SP3 with 4 DotHill 7200 systems on 4 nodes A.Maslennikov - Orsay 2001

  11. Projects for year 2001 • Syscontrol DB • - mysql now, migration to InterBase by the end of 2001 • - Hosts’ DB and Syslog event collector DB • - Hooks for syscontrol applications • Control and Monitoring • - agent up and running on all Linux hosts • - being ported to other architectures (encryption) • - server integration with Syscontrol DB(event logs and configuration) • Problem management • - currently study possible solutions, Razor is one of the options • Console Server • - planned for the second half of 2001 • - currently look at the serial hardware • Security • - accent on host-based • - host security “index” is being developed to integrate with Syscontrol A.Maslennikov - Orsay 2001

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