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Home -> Community -> Mailing Lists -> Oracle-L -> Re:RE: I have a clarification
Guy,
If I understand the Network Appliance sales droids correctly WAFL stands for Write Anywhere File Layout. In practice that means that the filer writes your data to the first available block on the file system irrespective of where the file's other blocks are. This could be in the same sector of the same disk, or on a different drive and in a different sector altogether. The point is that you as a user don't care, it's just one ENORMOUS, and dynamically expandable, disk drive. It is suppose to be extremely fast (I'm using one right now for NT files) although I can't say I've seen any kind of difference. One other point with NetApp is that they accept the data (writing it to flash ram) and lot you get on with your life, then they write the data to disk and calculate the raid checksum (or whatever else they call it today) later after your gone.
Dick Goulet
____________________Reply Separator____________________ Author: "Guy Hammond" <guy.hammond_at_avt.co.uk> Date: 7/11/2001 9:21 AM
Slightly off topic, but would anyone care to comment on the advantages and disadvantages of WAFL versus something like HP AutoRAID?
Thanks,
g
-----Original Message-----
Sent: Wednesday, July 11, 2001 4:36 PM
To: Multiple recipients of list ORACLE-L
BTW, got your book... great job!! You make mention of NetApp and RAID4
in
your book. You say RAID4 is like RAID3 (except it's block level parity)
so I
assume it performs like RAID3 which you state is better for DSS but not
as
good for OLTP. NetApp claims to have overcome RAID4 performance issues
with
their wafl architecture. Any feedback on this?
Waiting for your next book,
Steve Orr
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Guy Hammond
INET: guy.hammond_at_avt.co.uk
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists --------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists --------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Wed Jul 11 2001 - 11:54:30 CDT
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