DSM Review, NFS, AFS - Revision history

Jmahonin: /* In Class Notes */

2008-02-13T20:34:05Z

In Class Notes

← Older revision		Revision as of 20:34, 13 February 2008
Line 41:		Line 41:
	# Files are up-to-date, can be inconsistent		# Files are up-to-date, can be inconsistent
	# Trusted clients		# Trusted clients
			# Stateless

	==== AFS ====		==== AFS ====
Line 48:		Line 49:
	# Files may be stale, but data is consistent		# Files may be stale, but data is consistent
	# Untrusted clients		# Untrusted clients
			# Stateful

			=== Contributions ===
			==== NFS ====
			* Kmalloc
			* VFS
			* (XDR, SunRPC)

	=== Aside: Kerberos for Dummies ===		=== Aside: Kerberos for Dummies ===

Jmahonin: /* In Class Notes */

2008-02-13T20:14:23Z

In Class Notes

← Older revision		Revision as of 20:14, 13 February 2008
Line 23:		Line 23:
	== In Class Notes ==		== In Class Notes ==
	=== Goals of NFS and AFS ===		=== Goals of NFS and AFS ===
			==== NFS ====
	====NFS====
	* Remote access like local access		* Remote access like local access
	* Scale to ~50 clients		* Scale to ~50 clients
Line 30:		Line 29:
	* Lightweight		* Lightweight

	====AFS====		==== AFS ====
	* ~~Seamless~~		* Remote access like local access
	* Scale to 5000 - 10000 hosts		* Scale to 5000 - 10000 hosts
	* Portability (POSIX)		* Portability (POSIX)

	=== Differences ===		=== Differences ===
			==== NFS ====
	====NFS====
	# NFS does a system call for every read/write		# NFS does a system call for every read/write
	# NFS can operate with diskless clients		# NFS can operate with diskless clients
	# Lightweight clients		# Lightweight clients
			# Files are up-to-date, can be inconsistent
			# Trusted clients

	====AFS====		==== AFS ====
	# AFS does a system call only on retrieving and storing a file		# AFS does a system call only on retrieving and storing a file
	# AFS assumes clients have a hard disk		# AFS assumes clients have a hard disk
	# Heavier-weight client		# Heavier-weight client
			# Files may be stale, but data is consistent
			# Untrusted clients

			=== Aside: Kerberos for Dummies ===
			<pre>
			1. Client Identification: <client> ==> <kerberos>
			2. Client Request Ticket: <client> <== <kerberos>
			3. Authenticate with Ticket: <client> ==> <server>
			</pre>

Jmahonin at 19:57, 13 February 2008

2008-02-13T19:57:47Z

← Older revision		Revision as of 19:57, 13 February 2008
Line 21:		Line 21:
	# How suitable are NFS and AFS in modern small networks? Enterprise networks? Internet-scale applications? Why?		# How suitable are NFS and AFS in modern small networks? Enterprise networks? Internet-scale applications? Why?

	== Goals of NFS and AFS==		== In Class Notes ==
			=== Goals of NFS and AFS ===

	===NFS===		====NFS====
	* Remote access like local access		* Remote access like local access
	* Scale to ~50 clients		* Scale to ~50 clients
Line 29:		Line 30:
	* Lightweight		* Lightweight

	===AFS===		====AFS====
	* Seamless		* Seamless
	* Scale to 5000 - 10000 hosts		* Scale to 5000 - 10000 hosts
	* Portability (POSIX)		* Portability (POSIX)

	== Differences ==		=== Differences ===

	===NFS===		====NFS====
	# NFS does a system call for every read/write		# NFS does a system call for every read/write
	# NFS can operate with diskless clients		# NFS can operate with diskless clients
			# Lightweight clients

	===AFS===		====AFS====
	# AFS does a system call only on retrieving and storing a file		# AFS does a system call only on retrieving and storing a file
	# AFS assumes clients have a hard disk		# AFS assumes clients have a hard disk
			# Heavier-weight client

Jmahonin: /* Goals of NFS and AFS */

2008-02-13T19:55:28Z

Goals of NFS and AFS

@@ Line 22: / Line 22: @@
 == Goals of NFS and AFS==
 ===NFS===
 * Remote access like local access
@@ Line 32: / Line 33: @@
 * Scale to 5000 - 10000 hosts
 * Portability (POSIX)

Jmahonin at 19:50, 13 February 2008

2008-02-13T19:50:50Z

← Older revision		Revision as of 19:50, 13 February 2008
Line 20:		Line 20:
	# What are their limitations?		# What are their limitations?
	# How suitable are NFS and AFS in modern small networks? Enterprise networks? Internet-scale applications? Why?		# How suitable are NFS and AFS in modern small networks? Enterprise networks? Internet-scale applications? Why?

			== Goals of NFS and AFS==
			===NFS===
			* Remote access like local access
			* Scale to ~50 clients
			* Portability
			* Lightweight

			===AFS===
			* Seamless
			* Scale to 5000 - 10000 hosts
			* Portability (POSIX)

Soma: /* Questions */

2008-02-06T03:08:19Z

Questions

← Older revision		Revision as of 03:08, 6 February 2008
Line 9:		Line 9:
	==Questions==		==Questions==

	For the ~~first~~ paper, consider the following:		For the Protic paper, consider the following:
	~~what~~ were the major ~~advances~~ in DSM research? Did these advances change ~~what sort~~ of problems DSM		# What were the major problems addressed in DSM research following Kai Li's dissertation?
			# Did these advances change the scope of environments and problems appropriate for DSM?
			# Why aren't DSM systems commonly in use today?


			For the NFS and AFS papers, consider these questions:
			# What were the key design goals of NFS and AFS?
			# How well did they achieve their goals?
			# What are their limitations?
			# How suitable are NFS and AFS in modern small networks? Enterprise networks? Internet-scale applications? Why?

Soma at 03:03, 6 February 2008

2008-02-06T03:03:14Z

New page

==Readings==

* [http://homeostasis.scs.carleton.ca/~soma/distos/2008-02-11/protic-overview.pdf Jelica Protic et al., "Distributed Shared Memory: Concepts and Systems" (1996)]<br />This paper reviews work in the area of distributed shared memory.

* [http://homeostasis.scs.carleton.ca/~soma/distos/2008-02-11/sandberg-nfs.pdf Russel Sandberg et al., "Design and Implementation of the Sun Network Filesystem" (1985)]<br />This is the original NFS paper.

* [http://homeostasis.scs.carleton.ca/~soma/distos/2008-02-11/howard-afs.pdf John H. Howard et al., "Scale and Performance in a Distributed File System" (1988)]<br />This paper describes AFS and compares it to NFS.

==Questions==

For the first paper, consider the following:
what were the major advances in DSM research? Did these advances change what sort of problems DSM