Original Link: http://www.anandtech.com/show/6853/qnap-launches-marvellbased-4bay-rackmount-nas-units
QNAP Launches Marvell-based 4-bay Rackmount NAS Unitsby Ganesh T S on March 23, 2013 2:49 PM EST
Rackmount NAS units introduced in recent days have been mostly based on the powerful Intel processors, but there is a market demand amongst small workgroups and SMBs for low power NAS devices in that form factor. In order to serve this market, QNAP is launching the TS-421U and TS-420U, both of which are based on the tried and tested Marvell 6282 CPU.
The 420U runs the CPU at 1.6 GHz, while the 421U cranks it up to 2.0 GHz. Both units have four hot-swappable bays in a 1U rackmount form factor. There are two GbE ports, two USB 3.0 ports, two eSATA ports and a single USB 2.0 port in front. The PSU is built-in. Internally, the units sport 1 GB of DDR3 DRAM (double that of the amount usually found in the Marvell-based 4-bay units with a tower form factor).
iSCSI (with think provisioning) support exists and the dual LAN ports can be configured in various port trunking modes. Windows AD and LDAP directory services can help in easy account setup from a AD/LDAP-based directory server. Backup strategies available in the new units include Real-time Remote Replication (RTRR), backup to cloud storage and support for third-party backup softwares. Time Machine is supported and QNAP provides the NetBak replicator for backing up PC data to a Turbo NAS.
More details about the two new rackmount products can be found here.