Dell EqualLogic PS6510X review

Dell’s new EqualLogic PS6510X delivers full 10-Gigabit speeds, heaps of storage and extreme ease of use. In this exclusive review we find out if this is the IP SAN appliance enterprises have been waiting for.

Dell's optional SAN HeadQuarters is designed to manage multiple appliances from a central console and also sees a redesign to allow it to support the new features. You add your groups which all appear in the left pane along with a choice selection of statistics and graphs for each one.

You can view detailed reports on capacity which show the total space for the group and how it's split up into volumes and snapshots. The display has been updated with graphs showing total group storage and I/O capacity along with headroom for both categories.

The network option has a speedometer dial showing overall network utilisation although we noticed that Dell appears to have its calculations wrong. It's using a maximum available throughput of 20Gb/sec, which incorrectly showed a 50 per cent utilisation during our maximum throughput tests. Only 10Gb/sec bandwidth is available due to load balancing so utilisation should be close to 100 per cent.

For testing we used a Dell m1000e blade server equipped with M610 blades with dual L5530 Xeons, 16GB of DDR3 memory, dual port 10GbE mezzanine cards and running Windows Server 2008 R2. We used a PowerConnect 8024 10GbE switch blade and all ports on the PS6510X were linked into it.

We tested with MPIO links configured for both 10GbE ports on the M610 blade. Setting these up using Dell's host integration tools is swift as you just connect the physical network ports, log on to the portal and target and Dell does the rest. Note that jumbo frames must be enabled throughout along with flow control and all iSCSI initiators must have the least queue depth load balancing option selected.

Using one M610 blade, we logged on to four 100MB virtual volumes and ran Iometer configured with one disk worker for each volume and 256KB sequential read transfer requests. It reported a steady raw read throughput of 1158MB/sec, which equates to 9.05Gb/sec close to wire speed for a 10GbE link.

We then brought a second M610 blade server into play and logged it into it own dedicated quartet of virtual volumes. With Iometer running on both server blades we saw speeds of 622MB/sec and 537MB/sec respectively also equating to a cumulative throughput of 9.05Gb/sec.

Our test results show that the PS6510X is quite capable of delivering top performance over 10GbE networks. Combine this with its high capacity and expansion potential plus the fact that one price includes virtually all features as standard and you have the perfect IP SAN appliance.


The PS6510X amalgamates a superb mix of high performance, storage density and ease of deployment in a compact and well built chassis. The latest features make it suited to enterprise virtualised environments and there’s more yet to come as well. The price initially looks high but bear in mind that, unlike some other storage vendors, Dell doesn’t consider many essential features as optional. Consequently, a single upfront price includes snapshots, thin provisioning, storage tiering and replication as standard and not as expensive optional extras.

Chassis: 4U rack Power: 3 x 440W hot-plug Storage: 48 x 600GB 10K SAS hard disks in hot-swap carriers RAID: 5, 6, 10, 50 Controllers: 2 (active/standby) Each with: Memory: 1GB MicroSD Cache: 4GB Battery backup: Yes (72 hours) Network: 2 x 10GbE SFP+ ports Management: CLI, Web browser, optional Dell SAN HeadQuarters

Dave Mitchell

Dave is an IT consultant and freelance journalist specialising in hands-on reviews of computer networking products covering all market sectors from small businesses to enterprises. Founder of Binary Testing Ltd – the UK’s premier independent network testing laboratory - Dave has over 45 years of experience in the IT industry.

Dave has produced many thousands of in-depth business networking product reviews from his lab which have been reproduced globally. Writing for ITPro and its sister title, PC Pro, he covers all areas of business IT infrastructure, including servers, storage, network security, data protection, cloud, infrastructure and services.