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Home -> Community -> Mailing Lists -> Oracle-L -> 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 =
'stripe and mirror everthing'
BHT =
'butylated hydroxytoluene'
<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
href="http://www.uni-mainz.de/~neuffer/scsi/what_is_raid.html"
target=_blank>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:
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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