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when deleting big files in IFS, cleanup creates huge amounts of read/write I/O in background jobs P0FBAIT00N etc. This I/O blocks further processing if IBM i is used as FTP server and FTP processing first CDs into a directory, deletes existing files and then sends new files. Sometimes deletion needs long so FTP client will disconnect due to timeout. The deletion in general produces a high amount of read / write I/O which kills mid-sized HDD based storage. Circumvention only by massive caching or flash based storage. Processing of deletion should run in background and reduce amount of I/O.
a) storing 40TB+ of data as backup from other systems (IBM i and PC), mainly big files 5GB up to 100GB in a flat directory structure. Files will be deleted and newly created using FTP daily
b) storing big amount of small files (<300k) in a directory structure with 50.000+ files in a single directory.
c) using BRMS to dump to tape and manage retention of data.
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