DHCPD performance -- solid-state disks?

Bryan J Smith b.j.smith at ieee.org
Fri Sep 9 18:19:45 UTC 2011

They still exist.  BB SDRAM is still preferred for writes.  NAND EEPROM is now the new, preferred technology for reads, especially random reads where NAND doesn't suffer from seek like disks.  But NAND EEPROM still sucks in performance for writes, let alone when it comes to longevity with lots of writes.

In fact, the main problem with NAND EEPROM is that it still heavily relies on SDRAM for buffering writes, which adds back in the same problem as disks.  So NAND EEPROM is not going to replace BB SDRAM any time soon, with one exception.  If they start putting more SDRAM in NAND EEPROM devices, then they will also start putting BB in the devices as well.

Now those might be the ideal, "universal" devices.  But until then, BB SDRAM for writes, NAND EEPROM for reads.
From: Bruce Hudson <Bruce.Hudson at Dal.Ca>
Sent: Friday, September 9, 2011 12:36 PM

    A long time ago, for another application, we used to use battery
backed, write through RAM caches in front of real disks. The batteries
just had to last a few minutes, long enough to flush the cache onto
the disk. That would give you the best of both worlds, non-volitile
storage at RAM speeds; assuming such a device still exists. 

More information about the dhcp-users mailing list