Date: Thu, 19 May 2005 17:07:43 -0300 From: =?ISO-8859-1?Q?Tulio_Guimar=E3es_da_Silva?= <tuliogs@pgt.mpt.gov.br> To: freebsd-hardware@freebsd.org Subject: Weird behaviour of AIT-3 and (g)tar Message-ID: <428CF20F.50607@pgt.mpt.gov.br>
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j4JK7kjd041873
Hello again,
I=B4m having some trouble putting a Sony SDX-700V SCSI AIT-3 unit to=20
work on FreeBSD 5.3-RELEASE.
The first issue is: it runs toooooooo slow. Transfers with tar=20
(whithout -j, -z and such) or "cat file >/dev/sa0" go at about 800kB/s,=20
though it should be more than 10MB/s. This wouldn=B4t be a big issue, but=
=20
then comes the second problem...
Besides the speed, hardware compression seems to not being funcional=20
either. I already tried every 4 possible dip switch setting for=20
compression, but I am still not able to transfer a 180GB archive to a=20
(should-be) 260GB medium. And when I thought I could live with that...
Third problem: tar does not (re)store all files, specially when I set=20
block ("-b") sizes. With -b 64 and upper, tar would end perfectly and=20
fast, but when trying to restore or list it ends prematurely; i=B4m now=20
trying to test with -b 10, but it=B4s already taking more than 20 hours t=
o=20
complete the transfer, and I don=B4t know if it will end before this=20
weekend. :)
There=B4s no change if I use tar or gtar. :(
Now for the environment:
HP ML 110 server, 2.8 GHz HT (enabled)
4x80GB SATA disks in RAID5 on a HighPoint Rocket Raid 1820A
Adaptec 2940UW or Ultra160, doesn=B4t matter...
I think i=B4m using correct cabling :) ; with the 2940UW I use a=20
standard flat-68 and termination on the device, or, the Ultra160 goes=20
with a terminated 2-device twisted flat cable on the card=B4s LVD=20
connector (not the SE). That=B4s what we use for other SCSI machines too.
Is there any known issue with AIT-3 tapes? Am I missing or doing=20
something wrong? Should I change to another backup software?
Well, thanks again for your attention. Ideas are *very* welcome.
Tulio
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