Skip to navigation

IBM System Storage DS3512 Express review


An affordable and flexible network storage solution with excellent performance and massive expansion potential

Review Date: 8 Dec 2010

Reviewed By: Dave Mitchell

Price when reviewed: £2,835 (£3,331 inc VAT)

Overall Rating
6 stars out of 6

Features & Design
6 stars out of 6

Value for Money
5 stars out of 6

6 stars out of 6

PCPRO Recommended

Network storage arrays aimed at SMBs are invariably offered with only SATA hard disks to keep costs down. IBM's latest System Storage DS3500 family brings 6Gbits/sec SAS within their grasp, and here we put the DS3512 through its paces and see whether compromises have been made in the search for value.

The DS3500 family consists of two head unit options, with the DS3512 on review supporting 12 3.5in drives. The DS3524 is also a 2U appliance, but can handle up to 24 2.5in disks; prices for this start at £3,087. Both models have a single controller that can be upgraded with a second where they run in active/active mode.

IBM gets the value ball rolling: along with standard SAS and full disk encryption (FDE) SAS drives, it also offers near-line SAS. These new drives deliver the high capacity and low cost of SATA but with SAS drive electronics. Offered with 7.2k spindle speeds, they do away with the need for a SATA-SAS interposer, so reducing manufacturing costs and potential failures. They also have the same level of host queueing support as standard SAS drives.

IBM System Storage DS3512 Express

The DS3500 controllers offer plenty of connection options. You start with a pair of fixed 6Gbits/sec SAS ports for DAS applications, but there's room for a daughtercard, and IBM offers dual-port 6Gbits/sec SAS or quad-port 8Gbits/sec Fibre Channel and Gigabit iSCSI options. Our review system came with the 8Gbits/sec Fibre Channel card.

Expansion potential is based on the drive count, not the number of shelves. Each controller has an embedded 36-port SAS expander linked to its expansion port, so a pair can support up to 96 hard disks. You can daisy-chain as many shelves as you like, as long as you don't go over this number of drives.

You can mix and match IBM's EXP3512 and EXP3524 expansion shelves, join them with multiple redundant SAS paths and have different SAS drive types within the same shelf. The controllers have 1GB of cache, but the battery backup plays a different role to what it usually does. In the event of a power failure it keeps the controller running, so cache contents can be de-staged to an on-board 8GB SD memory card.

1 2
Subscribe to PC Pro magazine. We'll give you 3 issues for £1 plus a free gift - click here
User comments


I am keen to know how well IBM firmware performs the snapshots.
The Equallogics are able to do instant snapshots and all the snapshots are independent of each other - that means one can recover from any and every snapshot regardless of the order in which the snapshots were taken. I have being told this feature is unique in market, could you please confirm it?
Moreover, in case of volume recovery, Equallogic software will automatically take snapshot of the problematic volume prior to recovering from the snapshot.

Thank you.

By stasi47 on 9 Dec 2010

"been told" of course... forgive me my English... :$

By stasi47 on 9 Dec 2010


I want to buy! ((DS3512 Dual Controller (1746A2D))!!! I ask to send on my mail the offer!

By marat on 14 Apr 2011

Leave a comment

You need to Login or Register to comment.


Latest Category Reviews
Qsan TrioNAS U221 review

Qsan TrioNAS U221

Category: Storage appliances
Rating: 5 out of 6
Price: £4,080
Qnap TS-870U-RP review

Qnap TS-870U-RP

Category: Storage appliances
Rating: 5 out of 6
Price: £1,759
Asustor AS-604T review

Asustor AS-604T

Category: Storage appliances
Rating: 5 out of 6
Price: £551
Iomega StorCenter px12-450r review

Iomega StorCenter px12-450r

Category: Storage appliances
Rating: 4 out of 6
Price: £3,841
TP-Link JetStream TL-SG3424P review

TP-Link JetStream TL-SG3424P

Category: Switches
Rating: 5 out of 6
Price: £275
Compare reviews: Storage appliances


Latest News Stories Subscribe to our RSS Feeds
Latest Blog Posts Subscribe to our RSS Feeds
Latest Features
Latest Real World Computing


Sponsored Links


Your email:

Your password:

remember me


Hitwise Top 10 Website 2010

PCPro-Computing in the Real World Printed from

Register to receive our regular email newsletter at

The newsletter contains links to our latest PC news, product reviews, features and how-to guides, plus special offers and competitions.