[FSUG PD] test dischi, di chi mi devo fidare?

[max_xxv]

ok, rifatto qualche test ed in effetti le cose vanno meglio anche se
mi apsetterei prestazioni ben diverse:

**********************************************************************
lnx_srv tmp # time dd if=/dev/zero of=test.dat count=1M
1048576+0 records in
1048576+0 records out
536870912 bytes (537 MB) copied, 11.3841 s, 47.2 MB/s

real    0m13.854s
user    0m0.408s
sys     0m4.652s
**********************************************************************

**********************************************************************
lnx_srv tmp # time dd if=/dev/zero of=test.dat count=2M
2097152+0 records in
2097152+0 records out
1073741824 bytes (1.1 GB) copied, 39.0457 s, 27.5 MB/s

real    0m39.187s
user    0m0.684s
sys     0m9.841s
**********************************************************************

**********************************************************************
lnx_srv tmp # time dd if=/dev/zero of=test.dat count=300k
307200+0 records in
307200+0 records out
157286400 bytes (157 MB) copied, 1.47567 s, 107 MB/s

real    0m1.496s
user    0m0.100s
sys     0m1.380s
**********************************************************************



Il pounto è che ho prestazioni ridicole anche sul DLT che è collegato
su un controller SCSI  (e non RAID SATA) :

**********************************************************************
lnx_srv tmp # time dd if=/dev/zero of=/dev/st0 count=1M
157801+0 records in
157801+0 records out
80794112 bytes (81 MB) copied, 917.32 s, 88.1 kB/s

real    15m17.325s
user    0m0.204s
sys     0m1.352s
**********************************************************************

**********************************************************************
lnx_srv tmp # time dd if=/dev/zero of=/dev/st0 count=10k
10240+0 records in
10240+0 records out
5242880 bytes (5.2 MB) copied, 62.3545 s, 84.1 kB/s

real    1m2.358s
user    0m0.028s
sys     0m0.076s
**********************************************************************

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