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Full Discussion: problem with disks on SAN
Operating Systems Linux problem with disks on SAN Post 73823 by tom_xx_hu@yahoo on Sunday 5th of June 2005 10:05:55 PM
Old 06-05-2005
hmm.. Why would you consider it "too much"? I see it reasonable. The peak transfer rate to SAN (assuming you are using fiber link) is 100MB/s which is the ceiling. That leads you to 200s for 20GB data. Then, there are latencies, raid 5 parity generation, other application using SAN, etc.

So a bit slow but not unreasonable. In order to speed up, you may want to try smaller block size, say 8k or 16k. I would expect a ~100s less in real time with smaller block size.

Hope it helpful,
Tom
 

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FDFORMAT(8)						     Linux Programmer's Manual						       FDFORMAT(8)

NAME
fdformat - Low-level formats a floppy disk SYNOPSIS
fdformat [-n] device DESCRIPTION
fdformat does a low level format on a floppy disk. device is usually one of the following (for floppy devices, the major = 2, and the minor is shown for informational purposes only): /dev/fd0d360 (minor = 4) /dev/fd0h1200 (minor = 8) /dev/fd0D360 (minor = 12) /dev/fd0H360 (minor = 12) /dev/fd0D720 (minor = 16) /dev/fd0H720 (minor = 16) /dev/fd0h360 (minor = 20) /dev/fd0h720 (minor = 24) /dev/fd0H1440 (minor = 28) /dev/fd1d360 (minor = 5) /dev/fd1h1200 (minor = 9) /dev/fd1D360 (minor = 13) /dev/fd1H360 (minor = 13) /dev/fd1D720 (minor = 17) /dev/fd1H720 (minor = 17) /dev/fd1h360 (minor = 21) /dev/fd1h720 (minor = 25) /dev/fd1H1440 (minor = 29) The generic floppy devices, /dev/fd0 and /dev/fd1, will fail to work with fdformat when a non-standard format is being used, or if the for- mat has not been autodetected earlier. In this case, use setfdprm(8) to load the disk parameters. OPTIONS
-n No verify. This option will disable the verification that is performed after the format. SEE ALSO
fd(4), setfdprm(8), mkfs(8), emkfs(8) AUTHOR
Werner Almesberger (almesber@nessie.cs.id.ethz.ch) AVAILABILITY
The fdformat command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. Linux 0.99 1 February 1993 FDFORMAT(8)
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