I do not believe that the Compaq StorageWorks 4314 is a SAN ( Storage Area Network ). This unit appears to be a DAS. To qualify as a SAN it generally has to run Fibre Channel. However the NAS vendors are now trying to re-market there NAS devices as a SAN suggesting that you also put in a separate 1Gb or better copper lan, then technically that would also make a NAS Storage Array using ISCSI device a SAN. Keep in mind that any more then 30 milliseconds of write delay can cause corruption in an Exchange Database, that is why a real Fibre Channel SAN is preferred when it comes to Exchange Servers. Fibre Channel does not have the overhead that TCP/IP does when using ISCSI especially when you enable error checking in digest mode ( Highly Recommended ). TCP/IP offload cards from Adaptec, Qlogic, Emulex and others solve this, however that also adds to the cost. In my opinion ISCSI has a promising future and works well in small environments or in a dedicated 1GB lan.
Here is a link that you may want to look at:
Jose Medeiros :-)
Thanks Jose, I appreciate the info. I have a Compaq StorageWorks 4314 SAN (attached to a server) and a Snap Server 4100 (attached to the network). I'll have to learn more about the ISCSI Software for the Snap and the MSA500 for the Compaq and make a decision. Thanks again.
Jeffrey Moscone jeff@xxxxxxxxxxxxxx www.mosconeusa.com
-----Original Message----- From: Jose Medeiros [mailto:josemedeiros@xxxxxxxxxxx] Sent: Sunday, November 27, 2005 11:18 AM To: [ExchangeList] Subject: [exchangelist] Re: Exchange 2003 Cluster Question
You can use a NAS device using the ISCSI Initatator as long as the snap
server has ISCSI Target software. However if this is to be a heavily used server I would recommend against this unless it's on it's own Gigabit or
better LAN. HP has a MSA 500 with Direct Attached Storage ( DAS ) which is low cost and supports clustering. If you already have the servers that you want to use, take a look at the HP MSA 1500, that is what I am using in our QA IT Staging lab and I am very happy with it.
Please direct me to the correct forum if know one can answer this. Thanks!!!
I need to set up a Microsoft Windows Server 2003 Enterprise cluster (2node) with Exchange 2003 Enterprise. I've done a lot of research and found much useful information pertaining to set up, but not much in the storage arena. My question is can I use a NAS device for the quorum data, such as a Snap Server that is attached to my LAN (via ethernet) or do I need to have a SCSI Storage device with fiber connectivity between servers and storage?
Thanks a lot.