Fujitsu Eternus DX90 S2 review

Fujitsu's new DX90 S2 storage array claims to be much faster and more expandable than previous Eternus models. In this exclusive review, Dave Mitchell finds out just how fast it really is and whether it's good value or not.

Along with standard and thin provisioned volumes which are for general usage, you can create SDVs (snap data volumes). These are used by the SnapOPC+ (one point copy plus) feature which takes point-in-time copies of source volumes to an SDV. These copies are for temporary use, such as for offloading backups. You can map the SDV to another server where it initially appears as a raw disk. Once the SnapOPC+ task has finished, the SDV then becomes identical to the source and can be used for backup operations.

Thin provisioning has been missing from the Eternus arrays for too long, but is now an optional feature.

The REC feature mirrors data across separate arrays, but needs the additional SF Express software to configure and manage this.

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QuickOPC can also handle long-term backups by making an initial volume copy and then updating it incrementally on subsequent copies. Equivalent Copy maintains mirrors of one volume to another on the same local array and Remote Equivalent Copy (REC) mirrors volumes across arrays in different physical locations.

REC is the one function that cannot be managed from an array's own web interface and this requires an extra Windows system running Fujitsu's SF Express software. This presents a separate web interface for managing multiple arrays. Once the controllers have all been registered with SF Express, you can monitor them from one location and create or modify RAID groups and volumes. REC sessions require two appliances to be paired together after which the volumes can be mirrored.

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