Brief Announcement: Space Bounds for Reliable Multi-Writer Data Store

Reliable storage emulations from fault-prone components have established them- selves as an algorithmic foundation of modern storage services and applications. Most existing reliable storage emulations are built from storage services sup- porting custom-built read-modify-write (RMW) primitives (e.g., [2]). Since such primitives are not typically available with pre-existing or off-the-shelf components (such as cloud storage services or network-attached disks), it is natural to ask if they are indeed essential for effcient storage emulations. In this paper, we answer this question in the armative.