Usenix by Unknown

Author:Unknown
Language: eng
Format: mobi, epub
Publisher: The USENIX Association

Table 2: Wear analysis for our modified UBIFS file system. The expected lifetime is based on the Google Nexus One phone's data partition, which has 1571 erase blocks with a (conservative) lifetime estimate of 104 erasures.

To determine if our solution negatively impacts UBI's wear levelling, we performed the following experiment. Each time UBI unmaps an LEB from a PEB (thus resulting in an erasure) or atomically updates an LEB (also resulting in an erasure), we logged the erased PEB's number. From this data, we then compute the PEBs' erasure distribution.

To quantify the success of wear-levelling, we use the Hoover economic wealth inequality indicator—a metric that is independent of the storage medium size and erasure frequency. This metric comes from economics, where it quantifies the unfairness of wealth distributions. It is the simplest measure, corresponding to an appropriately normalized sum of the difference of each measurement to the mean. For our purposes, it is the fraction of erasures that must be reassigned to other erase blocks to obtain completely even wear. Assuming the observations are c1, ..., cn, and C =

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