What do we mean when say "iSCSI" boot without HDD needed?

What do we mean when say "iSCSI" boot without HDD needed?

Microsoft Internet SCSI (iSCSI) Boot enables you to start Windows Server®-based computers by using a network adapter or an iSCSI host bus adapter (HBA) as an alternative method of accessing block-level storage to local storage. This can help save both power consumption and heat generated by eliminating the need for local storage on each server or blade server.
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Joseph DalyCommented:
They are basically talking about a boot from SAN setup. You can have servers that have no internal HDDs but rather boot using an iscsi target and load the OS from you SAN

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