Date: Tue, 26 Jul 2005 23:17:25 -0400 From: Chuck Swiger <cswiger@mac.com> To: ".VWV." <victorvittorivonwiktow@interfree.it> Cc: freebsd-questions@freebsd.org Subject: Re: certance DAT Message-ID: <42E6FCC5.8070309@mac.com> In-Reply-To: <007b01c59251$925c5ca0$98edfea9@workstation> References: <007b01c59251$925c5ca0$98edfea9@workstation>
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[ ...crossposting trimmed... ] .VWV. wrote: > I would like to know, if the following product can be used, in order to > make tape dumps or tape tars with the FreeBSD 4.x. > > http://www.certance.com/products/dds-dat/dat72/CD72LWH-SS Most probably. I've a Dell 2850 using a very similiar Seagate DAT72 tape drive, which dmesg claims as: sa0 at amr0 bus 1 target 6 lun 0 sa0: <SEAGATE DAT DAT72-052 A060> Removable Sequential Access SCSI-3 device ...and this works just fine with dump & tar via /dev/nsa0. I'd be happier if it was a DLT or LTO/Ultrium tape system, though. Note that I'm only getting about 2.5-3 MB/s effective transfer rates to it via: DUMPARGS="-0acLu -b 64 -C 24 -f /dev/nsa0" ...so it's not exactly super-zippy, either. Hmm, is it just me, or are the following numbers significantly low for a RAID-1 of two 10K RPM U320 SCSI disks...? /dev/amrd1 512 # sectorsize 73274490880 # mediasize in bytes (68G) 143114240 # mediasize in sectors 8908 # Cylinders according to firmware. 255 # Heads according to firmware. 63 # Sectors according to firmware. Seek times: Full stroke: 250 iter in 1.824059 sec = 7.296 msec Half stroke: 250 iter in 1.805398 sec = 7.222 msec Quarter stroke: 500 iter in 4.254147 sec = 8.508 msec Short forward: 400 iter in 2.821081 sec = 7.053 msec Short backward: 400 iter in 2.860203 sec = 7.151 msec Seq outer: 2048 iter in 8.821875 sec = 4.308 msec Seq inner: 2048 iter in 9.006505 sec = 4.398 msec Transfer rates: outside: 102400 kbytes in 9.242111 sec = 11080 kbytes/sec middle: 102400 kbytes in 9.230325 sec = 11094 kbytes/sec inside: 102400 kbytes in 10.779231 sec = 9500 kbytes/sec [ This is running RELENG_5_4... ] -- -Chuck
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