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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

CASPUR SAN News

Andrei Maslennikov

Orsay, April 2001

will be discussed
Will be discussed:
  • Goals
  • Fabric
  • Bridges
  • Adding a new device to fabric
  • Our devices
  • Distributed Tapes
  • Some plans

A.Maslennikov - Orsay 2001

goals
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

fabric
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

slide5
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

bridges
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

new device step by step
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

our current devices
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

distributed tapes

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

some plans
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

projects for year 2001
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