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- W2018102393 abstract "In distributed storage systems, erasure codes with locality $r$ is preferred because a coordinate can be recovered by accessing at most $r$ other coordinates which in turn greatly reduces the disk I/O complexity for small $r$. However, the local repair may be ineffective when some of the $r$ coordinates accessed for recovery are also erased. To overcome this problem, we propose the $(r,delta)_c$-locality providing $delta -1$ local repair options for a coordinate. Consequently, the repair locality $r$ can tolerate $delta-1$ erasures in total. We derive an upper bound on the minimum distance $d$ for any linear $[n,k]$ code with information $(r,delta)_c$-locality. For general parameters, we prove existence of the codes that attain this bound when $ngeq k(r(delta-1)+1)$, implying tightness of this bound. Although the locality $(r,delta)$ defined by Prakash et al provides the same level of locality and local repair tolerance as our definition, codes with $(r,delta)_c$-locality are proved to have more advantage in the minimum distance. In particular, we construct a class of codes with all symbol $(r,delta)_c$-locality where the gain in minimum distance is $Omega(sqrt{r})$ and the information rate is close to 1." @default.
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- W2018102393 date "2014-11-01" @default.
- W2018102393 modified "2023-10-18" @default.
- W2018102393 title "Repair Locality With Multiple Erasure Tolerance" @default.
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- W2018102393 doi "https://doi.org/10.1109/tit.2014.2351404" @default.
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