1 / 10

pNFS: Requirements

Explore the 61st IETF requirements for pNFS, aiming for parallel access to diverse storage servers with enhanced scalability, interoperability, and security.

jamesgoodman
Download Presentation

pNFS: Requirements

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. pNFS: Requirements 61th IETF – DC November 10, 2004 pNFS, 61th IETF, DC

  2. Client Host Net Client NFSv4 NFSv4 Host Net NFS Server Storage Net NFS Server Storage Net Storage Servers Storage Servers NowÞGoal • Now: requested data moves through NFS server • Goal: reply from NFS server enables parallel access to diverse storage servers (NFS, iSCSI, FC, …) pNFS, 61th IETF, DC

  3. pNFS Requirements • In response to pNFS Problem Statement • Draft-gibson-pnfs-problem-statement-01.txt • Bandwidth & capacity scaling • Beyond one network endpoint for file system • Server bypass for client access to storage • NFSv4 minor extension desired • Extensible storage (backend) protocols • NFSv3, NFSv4, SCSI blocks, SCSI objects pNFS, 61th IETF, DC

  4. pNFS Reqs - NFS extensions • Industry-wide open standard • NFSv4 minor extension desired • No change to existing commands/results • New operations added via compound • Complimentary to, no dependence on RDMA pNFS, 61th IETF, DC

  5. pNFS Reqs - Scalability • Respond to scalable cluster computing • Scalable bandwidth wrt to total resources • Aggregate BW to files in one FS, one directory • Individual BW to single large files • Employ multiple network endpoints at storage • Scalable capacity wrt to total resources • Size of FS, directory, file can scale with storage pNFS, 61th IETF, DC

  6. pNFS Reqs - Interoperability • pNFS endpoints talk to non-pNFS NFSv4 • Storage protocol interoperability • Well defined storage protocol standards • Multiple different storage protocols, extensible • SBC (SCSI blocks), OSD (SCSI objects), NFSvX • Separability of storage protocols • NFSv4 extension operation does not need to interpret “layout state” specific to storage pNFS, 61th IETF, DC

  7. pNFS Reqs - Concurrent Sharing • Many clients access storage at same time • At device and file level • Change visibility can be asserted by client • Data & attribute change visibility not always determined • No assertion of client cache coherence • Logic modeled on Direct access mode pNFS, 61th IETF, DC

  8. pNFS Reqs - Recovery • Seek simple semantics to enable less complex implementations, interoperability • Slow recovery permissible, fast recovery possible • Client recovery may be “notify & retry” • Retry may be equivalent operation using only NFSv4 • Storage operations should be idempotent pNFS, 61th IETF, DC

  9. pNFS Reqs - Security • Security comparable to NFSv4 allowed • Security model for storage must be well defined • Trusted storage environments not ruled out, but must be well documented • Files: ACLs consistent over servers • Objects: OSD secure capabilities • Blocks: SAN access control tools (zoning, FC ACLs) pNFS, 61th IETF, DC

  10. pNFS Reqs - IANA • Need to name storage protocols • Divide namespace • 1) Reserved for this standard to define • 2) Reserved for vendor defined • 3) Open for in-house customer defined, non-unique • Storage naming defined by storage protocol pNFS, 61th IETF, DC

More Related