I have a question about how data moves through a SAN.
For example: Within an iSCSI SAN if Server A is mounted with a SAN disk and wants to copy data to Server B which is also mounted with a SAN disk, does the data transfer happen through the SAN raid/disks or the data moving through network server a --> server b?
In file level storage when using let say's file server in windows environment as long as I understand if we move data from client a to client b using file sharing from file server the data moved using network client a --> client b hence if in client a network slower than client b network the copy process would be as slow as client a network correct?
Sorry for my bad English.
Answer
Yes, you are right. Data flow path:
- hostA asks SAN for data
- hostA sends the data (over smb?) to hostB
- hostB tels SAN to write down the data
SAN doesn't understand file systems, network protocols between hostA/hostB. So the slowest link will limit the transfer.
As a solution to this (and many others) problem, there are network filesystems like Ceph.
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