a9109319d2
clustering is obsolescent technology so hardly anyone noticed. On a DORS 32160 SCSI drive with 4 tags, read clustering makes very little difference even for huge sequential reads. However, on a ZIP SCSI drive with 0 tags, the minimum overhead per block is about 40 msec, so very large clusters must be used to get anywhere near the maximum transfer rate. Using clusters consisting of 1 8K block reduces the transfer rate to about 250K/sec. Under msdosfs, missing read clustering is normal and a cluster size of 1 512 byte block reduces the transfer rate to about 25K/sec. Broken in: rev.1.18 |
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