I have a machine in the cloud which has a persistent disk. For the host, it appears as a SCSI disk. I see the following seting:
$ cat /sys/block/sda/device/scsi_disk/0\:0\:1\:0/cache_type
write back
What does this mean? Does it mean that on this machine, there is a write back cache being used by the scsi layer and so a write I/O op might be just making it to this cache before being deemed to be complete? (and later somehow get flushed to the actual disk across the network asyncronously)
Thanks.