Infortrend EonStor ESDS S16S-R2240-4 review
InforTrend's latest high-speed DAS appliance provides a simple method of expanding storage for multiple application servers. In this exclusive review, Dave Mitchell hooks it up to the labs' servers to test performance and see how easy it is to deploy.
However, it's worth taking a moment to get to grips with how storage is handled by the appliance. Logical drives are collections of physical hard disks grouped together in a RAID array. Once you've created a logical drive you can then create logical volumes. A logical volume can be confined to a single logical drive or it can be spread over multiple logical drives for even greater fault tolerance.
A logical volume comprises the total capacity of all included logical drives. Volumes can be divided into partitions. These are the actual storage devices that will be presented to your servers and are mapped to either controller and assigned a unique LUN.
Plenty of backup options are available. Snapshots provides point-in-time copies of partitions which can be used for rollback and recovery purposes. Source partitions can also be copied or mirrored to target partitions on other volumes. Once a mirror has completed, the pair can be split and the target mapped to a new LUN.
This is useful for offloading backup tasks as the target can be removable media attached to another server, reducing any potential performance lag on the source. Once the backup has completed, the source and targets are resynchronised and then split again ready for the next backup.
Optional thin provisioning allows you to create partitions that only use a small amount of space, but appear much larger to the host servers. As capacity is used, the appliance dynamically allocates blocks to the partition and when all the space is used up you can expand a partition into any free space on the logical volume.
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