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Re: [Xen-users] iscsi vs nfs for xen VMs

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Marcin Kuk <marcin.kuk@xxxxxxxxx>
  • Date: Thu, 27 Jan 2011 22:48:00 +0100
  • Delivery-date: Thu, 27 Jan 2011 13:49:13 -0800
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2011/1/27 Adi Kriegisch <adi@xxxxxxxxxxxxxxx>:
> Hi!
>> > to increase performances you can skip iscsi and you can try a SAS SAN
>> > (with some LSI SAS switch if you need more than 4 servers linked to a
>> > single SAN)
>> Do you get different types of SAN? SAN = iSCSI, last time I checked.
> from http://en.wikipedia.org/wiki/Storage_area_network:
>  Most storage networks use the SCSI protocol for communication between
>  servers and disk drive devices. A mapping layer to other protocols is used
>  to form a network:
>    * ATA over Ethernet (AoE), mapping of ATA over Ethernet
>    * Fibre Channel Protocol (FCP), the most prominent one, is a mapping of
>    * SCSI over Fibre Channel
>    * Fibre Channel over Ethernet (FCoE)
>    * ESCON over Fibre Channel (FICON), used by mainframe computers
>    * HyperSCSI, mapping of SCSI over Ethernet
>    * iFCP[2] or SANoIP[3] mapping of FCP over IP
>    * iSCSI, mapping of SCSI over TCP/IP
>    * iSCSI Extensions for RDMA (iSER), mapping of iSCSI over InfiniBand
>  Storage networks may also be built using SAS and SATA technologies. SAS
>  evolved from SCSI direct-attached storage. SATA evolved from IDE
>  direct-attached storage. SAS and SATA devices can be networked using SAS
>  Expanders.
> So SAN = iSCSI isn't quite it.

Never ending story...
This is only terminology - you can talk about it all the time, but the
question is... who cares? ;) Any of you will win - all this is named
by people, and tomorow all can have different meanings.

Marcin Kuk

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