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A presentation on NFS and some of the important patches for PNFS
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Red Hat Enterprise Linux and NFS | Syed M Shaaf1
Red Hat Enterprise Linux / NFS
Syed M ShaafSolution ArchitectRed Hat
Klaus OxdalPartner and Alliances, NordicsRed Hat
Red Hat Enterprise Linux and NFS | Syed M Shaaf2
WHAT WE DO
We offer a range of mission-critical software and services covering:
HOW WE DO IT. THE BENEFITS.We develop everything usingan OPEN SOURCE model.
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Red Hat Enterprise Linux and NFS | Syed M Shaaf3
PRODUCT PROCESS
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We commercialize theseinnovations together with a richecosystem of services & certifications.
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OUR CUSTOMERS
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We are pleased to offer supported enterprise-class Red Hat Enterprise Linux on demand for our customers.
Wherever you live, it is likely that several letters that youhave received have been read, coded, and processed for delivery by one of our systems using JBoss EnterpriseApplication Platform as the middleware foundation.
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Red Hat Enterprise Linux and NFS | Syed M Shaaf5
Red Hat Enterprise Linux
Red Hat Enterprise Linux and NFS | Syed M Shaaf6
RED HAT ENTERPRISE LINUX 6SCALABILITY
Red Hat Enterprise Linux and NFS | Syed M Shaaf7
RED HAT ENTERPRISE LINUX 6SCALABILITY
Red Hat Enterprise Linux and NFS | Syed M Shaaf8
RED HAT ENTERPRISE LINUX 6SCALABILITY
Red Hat Enterprise Linux and NFS | Syed M Shaaf9
RED HAT ENTERPRISE LINUX 6COMMUNITY LEADERSHIP
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NFS
Red Hat Enterprise Linux and NFS | Syed M Shaaf11
NFS V4
● NFS version 3 most used! Why Change it??Performance!
● Version 4 is now the default protocol version for RHEL6
● IETF: RFC3530: http://tools.ietf.org/html/rfc3530
Red Hat Enterprise Linux and NFS | Syed M Shaaf12
NFS Version 4.0 – Noteworthy features
● Version 4 is a Stateful Protocol.● Delegations
● Mandated Security
● Referrals
● Firewall Friendly (kinda!)
Red Hat Enterprise Linux and NFS | Syed M Shaaf13
NFS version 4 – Gotchas!
● “All My files are owned by NOBODY!!!”● Idmapping: [email protected] ==> 3606● DNS problem 90% of the time● 'Domain=' in /etc/idmapd.conf
● Mounting Legacy servers.● Mount negotiation start at v4● For Legacy server use /etc/nfsmount.conf mount
negotiation
Red Hat Enterprise Linux and NFS | Syed M Shaaf14
NFS version 4.1
● Sessions● Session IDs
● Parallel NFS (pNFS)● File Layout (NAS environment) - Netapp● Block Layout● Object Layout
● IETF: RFC5661● http://tools.ietf.org/html/rfc5661
Red Hat Enterprise Linux and NFS | Syed M Shaaf15
NFS version 4.1 in RHEL
● RHEL6 Client● Tech Preview in 6.2● pNFS: File layouts only
● RHEL7 Client● All layouts supported.
Red Hat Enterprise Linux and NFS | Syed M Shaaf16
NFS version 4.1 – Make it work!
● Enabling 4.1/pNFS on the client● mount -o minorversion=1
● Does the server support pNFS● nfs4filelayout_init: NFSv4 File Layout Driver
Registering..● “pnfs=<layout>” in /proc/self/mountstats
Red Hat Enterprise Linux and NFS | Syed M Shaaf17
NFS version 4.2
● Labeled NFS● Security contexts
● Server to Server Copy● offload to server copy operation
● Sparse Files
● IETF: Internet-Draft● http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion2-11
Red Hat Enterprise Linux and NFS | Syed M Shaaf18
6.4 and some important changes
Red Hat Enterprise Linux and NFS | Syed M Shaaf19
Operating system - IO
Data
Data
Data
StorageBuffers and Cache
Application Cache/Buffer Pool
Application
Operating System ( Kernel )
1: 2:
3:
Red Hat Enterprise Linux and NFS | Syed M Shaaf20
Operating system – Direct IO
Data
Data
Data
StorageBuffers and Cache
Application Cache/Buffer Pool
Application
Operating System ( Kernel )
1:
2:
Red Hat Enterprise Linux and NFS | Syed M Shaaf21
Direct IO with PNFS, is it useful?
● O_DIRECT patches into pnfs
● Access the storage directly. Why?
● Databases are a good candidate, when?
● All operations are done in block size multiples
Red Hat Enterprise Linux and NFS | Syed M Shaaf22
● Allow the number of available slots to grow with the TCP window size.
● RHEL 6.3 dynamically allocates RPC slots up to the sunrpc.tcp_max_slot_table_entries ( 65536)
● Previously the number of in-flight RPC requests was limited to 128 (default 16). This affected the performance of OLTP workloads when using the kernel based NFS client.
● NFS 4.1 max session slots is set with the boot parameter:
nfs.max_session_slots (do not set higher than above)
RED HAT ENTERPRISE LINUX 6Slots and TCP window size
Red Hat Enterprise Linux and NFS | Syed M Shaaf23
References
● Steve Dickson● http://people.redhat.com/steved/Summits/
● NFSv4.1 new features: Sessions, Parallel NFS (pNFS)● http://www.iaps.com/nfsv4.1-new-features.html
● Parallel NFS (pNFS)● http://www.pnfs.com/
Red Hat Enterprise Linux and NFS | Syed M Shaaf24
Thank you!
Syed M ShaafSolution ArchitectRed Hat
Klaus OxdalPartner and Alliances, NordicsRed Hat
