GANESHA, a multi-usage with large cache NFSv4 server Philippe - - PowerPoint PPT Presentation

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GANESHA, a multi-usage with large cache NFSv4 server Philippe - - PowerPoint PPT Presentation

Jul 28, 2023 379 likes •442 views

GANESHA, a multi-usage with large cache NFSv4 server Philippe Deniel Thomas Leibovici Jacques-Charles Lafoucrire FAST07 / Work in Progress Session 1 GANESHA and NFSv4 NFSv4 is a complex and generic protocol. It can be used to

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SLIDE 1

FAST’07 / Work in Progress Session

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GANESHA, a multi-usage with large cache NFSv4 server

Philippe Deniel Thomas Leibovici Jacques-Charles Lafoucrière

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SLIDE 2

FAST’07 / Work in Progress Session

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GANESHA and NFSv4

  • NFSv4 is a complex and generic protocol.

It can be used to access many different file systems

  • GANESHA is a NFSv4 Server that

focuses on the following points:

– Managing huge metadata and data caches (up to millions of entries) – Being able to provide access to different sets

  • f data
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SLIDE 3

FAST’07 / Work in Progress Session

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Why run in User Space ?

  • Less constraints than in Kernel Space
  • It’s easier to manage huge pieces of memory

(several Gigabytes) for building big caches

  • Many mechanisms have native access in User

Space (no need to use “rpc_pipefs”)

– Kerberos (used for RPCSEC_GSS), LDAP, SNMP

  • A code designed to run in User Space is more

portable.

– It now runs on Linux – Port to AIX and Solaris is a work in progress

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SLIDE 4

FAST’07 / Work in Progress Session

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Layered architecture

cache fs operations

File Content layer Metadata Cache

File System Abstraction Layer

HPSS CLAPI

RPC Dispatcher

RPCSEC_GSS Dup Req Layer

NFS V2 / V3 NFS V4

clients requests fs operations

Admin Logging External Control API

Hash Tables (Red Back Trees)

GSSAPI Security

Syslog API

Mount V1/V3

Proxy/Client NFS POSIX Interface

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SLIDE 5

FAST’07 / Work in Progress Session

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The File System Abstraction Layer modules

  • We currently have two available FSALs

– FSAL/HPSS: The HPSS Name Space via the HPSS CLAPI (HPSS is a HSM developed by the DOE and IBM Gov) – FSAL/POSIX: Any File System through « POSIX calls » (a Database is used to « reverse lookup » paths from file handles)

  • The following FSALs are under development

– FSAL/Proxy Client: with a FSAL which is a NFSv4 client, GANESHA will become a NFSv4 proxy – FSAL/LDAP: LDAP information is organized as trees. They can be browsed like the /proc fs. This access will be provided by this FSAL – FSAL/SNMP: this module will make it possible to browse MIBs information like /proc (SNMP OOID are nice to build file handles with them).

  • A FSAL will be developed on top of LUSTRE API to provide access

to LUSTRE file system for computers with no LUSTRE client but with a NFS client.