RE: SAME, WAFL and RAID

I think that you just run into :
RAIC: Redundant Array of Independent Consultants.

Yechiel Adar, Mehish Computer Services
adary_at_mehish.co.il

> -----Original Message-----
> From: Mohan, Ross [SMTP:MohanR_at_STARS-SMI.com]
> Sent: Wed, January 16, 2002 2:01 AM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: SAME, WAFL and RAID
>
> Yea, they were talking about clustering all right.
>
> sure
> uh huh
> right
> Whatever!
>
> -----Original Message-----
> From: Deshpande, Kirti [mailto:kirti.deshpande_at_verizon.com]
> Sent: Tuesday, January 15, 2002 6:26 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: SAME, WAFL and RAID
>
>
> New one I heard at our local Oracle office :
>
> RAIP = Redundant Array of Independent Processors
>
> (Those guys were talking about NT Clustering... )
>
>
>
> -----Original Message-----
> From: Mohan, Ross [mailto:MohanR_at_STARS-SMI.com]
> Sent: Tuesday, January 15, 2002 4:41 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: SAME, WAFL and RAID
>
>
> SAME = 'stripe and mirror everthing'
> BHT = 'butylated hydroxytoluene'
>
> -----Original Message-----
> From: Deshpande, Kirti [mailto:kirti.deshpande_at_verizon.com]
> Sent: Tuesday, January 15, 2002 5:29 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: SAME, WAFL and RAID
>
>
> Great ! Thanks for the info..
>
> - Kirti
>
> -----Original Message-----
> From: Nick Wagner [mailto:Nick.Wagner_at_quest.com]
> Sent: Tuesday, January 15, 2002 3:49 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: SAME, WAFL and RAID
>
>
>
> good question... RAID and WALF -- see below. SAME... no
> idea...
>
> RAID - (from
> <http://www.uni-mainz.de/~neuffer/scsi/what_is_raid.html> )
> What does RAID stand for ?
> In 1987, Patterson, Gibson and Katz at the University of
> California Berkeley, published a paper entitled "A Case for Redundant
> Arrays of Inexpensive Disks (RAID)" . This paper described various types
> of disk arrays, referred to by the acronym RAID. The basic idea of RAID
> was to combine multiple small, inexpensive disk drives into an array of
> disk drives which yields performance exceeding that of a Single Large
> Expensive Drive (SLED). Additionally, this array of drives appears to the
> computer as a single logical storage unit or drive.
>
> The Mean Time Between Failure (MTBF) of the array will be
> equal to the MTBF of an individual drive, divided by the number of drives
> in the array. Because of this, the MTBF of an array of drives would be too
> low for many application requirements. However, disk arrays can be made
> fault-tolerant by redundantly storing information in various ways.
>
> Five types of array architectures, RAID-1 through RAID-5,
> were defined by the Berkeley paper, each providing disk fault-tolerance
> and each offering different trade-offs in features and performance. In
> addition to these five redundant array architectures, it has become
> popular to refer to a non-redundant array of disk drives as a RAID-0
> array.
>
> WAFL (from the NetApp website)
> The WAFL (Write Anywhere File Layout) file system and the
> following features deliver enterprise-class availability:
> Consistency points. Always a consistent file-system
> image on disk, even after unplanned shutdowns. Virtually eliminates the
> need to run time-consuming file-system checks.
>
> Snapshot technology. Snapshots are
> near-instantaneous, transparent, read-only, online copies of the active
> file systems. Up to 31 Snapshots can be maintained for each data volume.
> Users can quickly recover deleted or modified files without administrative
> assistance or restore from tape backup. The Snapshot function requires
> minimal disk space and causes no disruption of service. Snapshots can be
> backed up to other media while users are modifying the active file system
> to minimize business disruption.
>
> SnapRestore software. Allows any system to revert
> back to a specified data volume Snapshot for instant file-system recovery.
> Terabytes can be recovered in minutes, rather than hours, without going to
> tape. The software also greatly facilitates scenario testing as well as
> providing disaster recovery and virus protection.
>
> Easy, cost-effective clustering. Safeguards against hardware
> failures by automatic filer takeover. Gives users continuous access to
> data.
>
> SnapMirror software. Provides remote mirroring at high
> speeds over a LAN or WAN. The asynchronous mirroring can be used for
> disaster recovery, replication, backup, or testing on a nonproduction
> system.
>
> -----Original Message-----
> From: Deshpande, Kirti [
> <mailto:kirti.deshpande_at_verizon.com>]
> Sent: Tuesday, January 15, 2002 1:23 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: SAME, WAFL and RAID
>
>
> Good idea..
>
> All I know about WAFL is the House where breakfast is served
> ;)
>
> - Kirti
>
> -----Original Message-----
> Sent: Tuesday, January 15, 2002 2:57 PM
> To: Multiple recipients of list ORACLE-L
>
>
> May I make a suggestion? It would be helpful if posters
> would expand
> acronyms the first time they use them. I, at least, have no
> idea what
> WAFL is. Thanks.
>
>
> --- Bill Becker <beckerb_at_mfldclin.edu> wrote:
> > Hello,
> >
> > I am looking for any pointers to white papers, etc.
> > that discuss the differences/similarities among
> > WAFL, SAME and RAID
>
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> Author: Deshpande, Kirti
> INET: kirti.deshpande_at_verizon.com
>
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