Performance comparison iSCSI and SAS

Hi there Experts,

Assuming that I have two equal Storages (same Maker/Model/Disks - and they don’t have any special firmware that boosts performance) BUT the one has iSCSI controller and the other one SAS.

Which of two will have better performance and why? (By means of I/O, stability etc.)

ps. please also advise your personal experience to any of two connection protocols

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
SAS will perform better than iSCSI, if this is direct attached storage, or iSCSI or SAS based SAN, e.g. HP P2000 series.

iSCSI has a higher overhead, because the SCSI packet is encapsulated.
mamelasAuthor Commented:
Dear Andrew,

In case of expandability (connecting 2 or more storages in order to expand storage capacity) is SAS still better solution?

So if i had to choose between one of two connection protocols whould you reccomend SAS ?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Normally, expanding storage is done via SAS cables!

if you have the ability to expand the storage shelves.

Host to Storage Controllers, SAS is faster.

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