Hi Tim We just signed a contract for external storage system from EMC and the configuration is going to be: Regular servers - connect as Nas Database servers - connect as San.
If I remember correctly Nas use SCSI connections while San use fiber. Yechiel Adar Mehish ----- Original Message ----- To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]> Sent: Thursday, November 07, 2002 1:43 AM > > In response to a post on data purging Tim Gorman wrote "some on SAN-based > > disk, some on NAS-based storage". > > > > Can someone please explain the differences between these technologies > > please. > > > > My understanding that a SAN is a group of disks which are available on a > > network and are not 'owned' by a server and have no direct cables into a > > server. > > I also understood NAS to be network based disk (duh!) > > Please correct, clarify, or comment as needed; I don't recall ever having > seen a formal definition for either acronym: > > * SAN (storage area network): storage-arrays connected by dedicated > high-speed interconnects (i.e. SCSI, SSA, FC-AL, etc) managed by a dedicated > server, including switches and routers to provide storage for one or > multiple storage clients (i.e. what we tend to call "servers")... > > * NAS (network-attached storage): storage that is hosted by (i.e. > mounted on) a dedicated, special-purpose server and made available to > network clients via IP protocols like NFS, Samba, etc across general-purpose > IP networks. For NAS, think "dedicated NFS server" or "dedicated file > server" or the like and you've got the idea... > > There are so many technologies mixed into SANs that I find it difficult to > generalize. It is probably more appropriate to define NAS first and then > say "SANs are everything else" in networked storage, but I thought I'd try > it the hard way... > > Further generalizing: > > * SANs are capable of faster and more sustainable I/O throughput rates, > but more complex and more expensive > * NAS are economical, easy to administer, and easy to implement, but > provide lower sustained I/O throughput rates > > For this reason, I don't see the question as an "either-or" proposition > (i.e. either all SAN or all NAS). They are each point-solutions along a > continuum, as illustrated in the "strategy" in my previous reply. Data > passes through a life-cycle, just like anything else. Requirements for > storage and retrieval can change during that life-cycle... > > ----- > > ... "continuum" ...... there's a high-class word I've been itching to use > ..... has the potential to become as hoity-toity and annoying as "paradigm" > and "juxtaposition", though... :-) > > > > > Thanks > > > > > > John > > > > -- > > Please see the official ORACLE-L FAQ: http://www.orafaq.com > > -- > > Author: > > INET: [EMAIL PROTECTED] > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > > San Diego, California -- Mailing list and web hosting services > > --------------------------------------------------------------------- > > To REMOVE yourself from this mailing list, send an E-Mail message > > to: [EMAIL PROTECTED] (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). > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > -- > Author: Tim Gorman > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Yechiel Adar INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (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).
