Networkers,

Last week I wrote a small perl program to verify my LTO-2 tapes.
I needed it after too many LTO tapes were marked full between 20 and 50 GB.
On some tapes (not all) I see some interesting time differences on an
otherwise idle machine

Hardware used:

Sun E450 with 2 400 Mhz CPU, 1 GB mem
scsi card:  LSILogic LSI22320-R
Exabyte 110L with IBM ULTRIUM2 drives (firmware: 38D0)

data written is a 128k block of gzipped random data from /dev/random

see curious timing below:

/dev/rmt/8b eagle 5 WR: 67 Gb 152 Seconds
/dev/rmt/8b eagle 5 WR: 68 Gb 66 Seconds
/dev/rmt/8b eagle 5 WR: 69 Gb 56 Seconds
/dev/rmt/8b eagle 5 WR: 70 Gb 56 Seconds
/dev/rmt/8b eagle 5 WR: 71 Gb 61 Seconds
/dev/rmt/8b eagle 5 WR: 72 Gb 105 Seconds
/dev/rmt/8b eagle 5 WR: 73 Gb 111 Seconds
/dev/rmt/8b eagle 5 WR: 74 Gb 55 Seconds
/dev/rmt/8b eagle 5 WR: 75 Gb 56 Seconds
/dev/rmt/8b eagle 5 WR: 76 Gb 59 Seconds
/dev/rmt/8b eagle 5 WR: 77 Gb 62 Seconds
/dev/rmt/8b eagle 5 WR: 78 Gb 182 Seconds
/dev/rmt/8b eagle 5 WR: 79 Gb 66 Seconds
/dev/rmt/8b eagle 5 WR: 80 Gb 56 Seconds
/dev/rmt/8b eagle 5 WR: 81 Gb 55 Seconds
/dev/rmt/8b eagle 5 WR: 82 Gb 62 Seconds
/dev/rmt/8b eagle 5 WR: 83 Gb 158 Seconds
/dev/rmt/8b eagle 5 WR: 84 Gb 71 Seconds
/dev/rmt/8b eagle 5 WR: 85 Gb 56 Seconds
/dev/rmt/8b eagle 5 WR: 86 Gb 56 Seconds
/dev/rmt/8b eagle 5 WR: 87 Gb 65 Seconds
/dev/rmt/8b eagle 5 WR: 88 Gb 63 Seconds
/dev/rmt/8b eagle 5 WR: 89 Gb 146 Seconds
/dev/rmt/8b eagle 5 WR: 90 Gb 59 Seconds
/dev/rmt/8b eagle 5 WR: 91 Gb 56 Seconds
/dev/rmt/8b eagle 5 WR: 92 Gb 56 Seconds
/dev/rmt/8b eagle 5 WR: 93 Gb 396 Seconds
/dev/rmt/8b eagle 5 WR: 94 Gb 559 Seconds

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