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Home -> Community -> Mailing Lists -> Oracle-L -> RE: SAME, WAFL and RAID
Yea,
they were talking about clustering all right.
<FONT face=Arial color=#0000ff
size=2>
<FONT face=Arial color=#0000ff
size=2>sure
uh
huh
right
<FONT face=Arial color=#0000ff
size=2>Whatever!
<FONT face=Tahoma
size=2>-----Original Message-----From: Deshpande, Kirti
[mailto:kirti.deshpande_at_verizon.com]Sent: Tuesday, January 15, 2002
6:26 PMTo: Multiple recipients of list ORACLE-LSubject:
RE: SAME, WAFL and RAID
New
one I heard at our local Oracle office :
<SPAN
class=141212423-15012002> RAIP = Redundant Array of Independent
Processors
<SPAN
class=141212423-15012002>
<SPAN
class=141212423-15012002> (Those guys were talking about NT Clustering...
)
<SPAN
class=141212423-15012002>
<SPAN
class=141212423-15012002>
<FONT face=Tahoma
size=2>-----Original Message-----From: Mohan, Ross
[mailto:MohanR_at_STARS-SMI.com]Sent: Tuesday, January 15, 2002 4:41
PMTo: Multiple recipients of list ORACLE-LSubject: RE:
SAME, WAFL and RAID
SAME
<FONT face=Tahoma
size=2>-----Original Message-----From: Deshpande, Kirti
[mailto:kirti.deshpande_at_verizon.com]Sent: Tuesday, January 15,
2002 5:29 PMTo: Multiple recipients of list
ORACLE-LSubject: RE: SAME, WAFL and RAID
<SPAN
class=290522822-15012002>Great ! Thanks for the info..
<SPAN
class=290522822-15012002>
-
Kirti
<SPAN
class=290522822-15012002>
<FONT face=Tahoma
size=2>-----Original Message-----From: Nick Wagner
[mailto:Nick.Wagner_at_quest.com]Sent: Tuesday, January 15, 2002
3:49 PMTo: Multiple recipients of list
ORACLE-LSubject: RE: SAME, WAFL and RAID
good question... RAID and WALF -- see
below. SAME... no idea...
RAID - (from <A target=_blank
href="http://www.uni-mainz.de/~neuffer/scsi/what_is_raid.html">http://www.uni-mainz.de/~neuffer/scsi/what_is_raid.html
) What does RAID stand for ? <FONT
size=2>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:
<FONT
size=2>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 [<A
href="mailto:kirti.deshpande_at_verizon.com">mailto:kirti.deshpande_at_verizon.com]
Sent: Tuesday, January 15, 2002 1:23 PM <FONT
size=2>To: Multiple recipients of list ORACLE-L <FONT
size=2>Subject: RE: SAME, WAFL and RAID
Good idea..
All I know about WAFL is the House where breakfast is served
;)
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