Commit d68056a7 authored by Mike Hibler's avatar Mike Hibler

Another random thought.

parent 4c05ab13
...@@ -20,12 +20,21 @@ Sources of info for the following include (from the testbed source repo): ...@@ -20,12 +20,21 @@ Sources of info for the following include (from the testbed source repo):
Disk: Disk:
* 40GB -> 500-1000GB (12-25x increase in capacity) * 40GB -> 500-1000GB (12-25x increase in capacity)
* ~50MB/sec -> ~100-150MB/sec (2-3x increase in throughput) * ~50MB/sec -> ~100-150MB/sec (2-3x increase in throughput)
* 7200-10000 rpm -> 7200-15000 rpm (0-1.5x decrease in rotational delay)
SSDs:
* 64-256GB
* 100-250MB/sec
* near zero latency
Net: Net:
* 100Mb/sec -> 1000Mb/sec (10x increase in BW) * 100Mb/sec -> 1000Mb/sec (10x increase in BW)
The bottlenecks and thus trade-offs have changed. This drives the changes The bottlenecks and thus trade-offs have changed. This drives the changes
below that we have made to frisbee...blah, blah. below that we have made to frisbee...blah, blah.
One example: drives have become faster due to increased density, but
heads/spindles don't move much faster. Thus avoiding seeks becomes even
more important.
Is disk imaging still relevant? There has been an increasing shift toward Is disk imaging still relevant? There has been an increasing shift toward
virtualization, and with that, the use of virtual disks. These disks can virtualization, and with that, the use of virtual disks. These disks can
be logically copied from a master disk; e.g., using COW techniques. There be logically copied from a master disk; e.g., using COW techniques. There
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