We have AIX and Spectrum Scale 5.1 and are compressing older data. We can compress data at about 10GB/minute and decompress data wicked fast using mmchattr, when a user reads data from a compressed file via application open / read calls.... it moves at about 5MB/s. Normally our I/O pipeline allows for 2400MB/s on a single file read.
What can we look at to speed up the read of the compressed data, are there any tunables that might affect this? As it is now if the backup daemon is backing up a compressed file, it can get stuck for hours, I will go and mmchattr to decompress the file, within a minute the file is decompressed, and backed up, then I simply recompress the file once backup has moved on. Any advice on how to improve the compressed reads under AIX would be very helpful. Alec
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