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Re: WangDAT 3400DX DDS2-120m tapetype
Hello Gene, On Wed, Sep 25, 2002 at 02:35:54AM -0400, Gene Heskett wrote: > The drive can do about 350-375 on hot rod machines, so its possible > the p133 is beginning to effect it somewhat. I certainly wouldn't AFAIR the machine had been quite busy otherwise at the time of that tapetype run. The backup last night (my first on this setup without hardware compression) achieved an average tape write rate of 344.6 KByte/s which is ok IMO. The drive is connected to an old Adaptec 1542 controller (ISA) which might as well slow things down... > want to run the compression on that machine as I'd think that a > dumptype spec of "compress server best" would be downright painfull > to watch, if you could manage to stay awake. :-) Besides, compress There's only one client backed up besides the server itself, and this is a moderately fast machine that does its own compress-best. However, I had once tried a "compress-best" on the server's own paritions and it took about 5 times longer than the usual. Now I'm back to compress-fast and happy with it. Greetings, Martin.
Re: WangDAT 3400DX DDS2-120m tapetype
On Wednesday 25 September 2002 05:33, Martin Schwarz wrote: >Hello Gene, > >On Wed, Sep 25, 2002 at 02:35:54AM -0400, Gene Heskett wrote: >> The drive can do about 350-375 on hot rod machines, so its >> possible the p133 is beginning to effect it somewhat. I >> certainly wouldn't > >AFAIR the machine had been quite busy otherwise at the time of > that tapetype run. The backup last night (my first on this setup > without hardware compression) achieved an average tape write rate > of 344.6 KByte/s which is ok IMO. The drive is connected to an > old Adaptec 1542 controller (ISA) which might as well slow things > down... It can also give some "unexpected" results if you ever add a changer robot, that card does NOT do tape stuff where the LUM != 0 well at all. >> want to run the compression on that machine as I'd think that a >> dumptype spec of "compress server best" would be downright >> painfull to watch, if you could manage to stay awake. :-) >> Besides, compress > >There's only one client backed up besides the server itself, and > this is a moderately fast machine that does its own > compress-best. However, I had once tried a "compress-best" on the > server's own paritions and it took about 5 times longer than the > usual. Now I'm back to compress-fast and happy with it. > >Greetings, >Martin. Good. I'm glad its working. But be aware that I've got 2 of those cards and had to retire them on getting my first and second changers. Which reminds me, I'd expect the second one is for sale if I'd think to check as it was too small for the assigned job. We built a 320g raid instead. Its a 4 tape magazine equipt Seagate internal with a DDS2 drive in it, just like mine. -- Cheers, Gene AMD K6-III@500mhz 320M Athlon1600XP@1400mhz 512M 99.16% setiathome rank, not too shabby for a WV hillbilly
Re: WangDAT 3400DX DDS2-120m tapetype
On Wednesday 25 September 2002 06:49, Gene Heskett wrote: [...[ >It can also give some "unexpected" results if you ever add a > changer robot, that card does NOT do tape stuff where the LUM != > 0 well at all. And darn these ancient fingers, that was supposed to be LUN != 1 above. My aplogies. [...] -- Cheers, Gene AMD K6-III@500mhz 320M Athlon1600XP@1400mhz 512M 99.16% setiathome rank, not too shabby for a WV hillbilly
Restore from tape (not using Amanda) syntax
Title: Restore from tape (not using Amanda) syntax Hi Peoples, I'm trying to dump from an Amanda tape onto the hard-drive by not using Amanda. This is probably a "you don't know how to use tar properly" question but: #mt -f /dev/rmt/0n status Vendor 'SONY ' Product 'SDX-300C ' tape drive: sense key(0x6)= Unit Attention residual= 0 retries= 0 file no= 0 block no= 0 #mt -f /dev/rmt/0n rewind I'm obviously doing something wrong here cause the command: #dd if=/dev/rmt/0n bs=32k skip=1 | /usr/local/bin/tar -cv -f /export/output.tar /usr/local/bin/tar: Cowardly refusing to create an empty archive The tape only has about 2GB of compressed data on it so it's not huge... Any ideas? Thanks, Gordon.
Re: use --build, --host, --target
On Tue, 24 Sep 2002, John Dalbec wrote: > Hadad wrote: > > [root@localhost amanda-2.4.3b4]# ./configure --disable-libtool > --without-client --with-user=amanda and --with-group=amanda > > Take out the word "and" here and you should be OK. That is, > ./configure --disable-libtool --without-client --with-user=amanda \ > --with-group=amanda I think he also doesn't want --without-client. Didn't he say hes going to back up just this one machine? It will need the client pieces installed in order for that to work. -Mitch
Re: Restore from tape (not using Amanda) syntax
--On Wednesday, September 25, 2002 21:38:55 +1000 Gordon Cormack <[EMAIL PROTECTED]> wrote: > Hi Peoples, > > I'm trying to dump from an Amanda tape onto the hard-drive by not using > Amanda. This is probably a "you don't know how to use tar properly" > question but: > > I'm obviously doing something wrong here cause the command: > #dd if=/dev/rmt/0n bs=32k skip=1 | /usr/local/bin/tar -cv -f > /export/output.tar > /usr/local/bin/tar: Cowardly refusing to create an empty archive The 'c' option to tar means 'create'. You need to extract so use 'x' instead. Frank > > The tape only has about 2GB of compressed data on it so it's not huge... > > > Any ideas? > > Thanks, > Gordon. > -- Frank Smith[EMAIL PROTECTED] Systems Administrator Voice: 512-374-4673 Hoover's Online Fax: 512-374-4501
Re: Restore from tape (not using Amanda) syntax
--On Wednesday, September 25, 2002 08:42:07 -0500 Frank Smith <[EMAIL PROTECTED]> wrote: > --On Wednesday, September 25, 2002 21:38:55 +1000 Gordon Cormack ><[EMAIL PROTECTED]> wrote: > >> Hi Peoples, >> >> I'm trying to dump from an Amanda tape onto the hard-drive by not using >> Amanda. This is probably a "you don't know how to use tar properly" >> question but: >> >> I'm obviously doing something wrong here cause the command: >> # dd if=/dev/rmt/0n bs=32k skip=1 | /usr/local/bin/tar -cv -f >> /export/output.tar >> /usr/local/bin/tar: Cowardly refusing to create an empty archive > > The 'c' option to tar means 'create'. You need to extract so use 'x' > instead. > I hate to reply to myself, but I didn't notice you were also giving tar a filename. If you just want the tar file that was on the tape, forget the pipe and use of=/export/output.tar. If you are trying to extract the tar that is on the tape, leave off the filename and tar will extract from stdin. Frank > >> >> The tape only has about 2GB of compressed data on it so it's not huge... >> >> >> Any ideas? >> >> Thanks, >> Gordon. >> > > > > -- > Frank Smith[EMAIL PROTECTED] > Systems Administrator Voice: 512-374-4673 > Hoover's Online Fax: 512-374-4501 -- Frank Smith[EMAIL PROTECTED] Systems Administrator Voice: 512-374-4673 Hoover's Online Fax: 512-374-4501
Re: Restore from tape (not using Amanda) syntax
On Wed, Sep 25, 2002 at 09:38:55PM +1000, Gordon Cormack wrote: > > I'm trying to dump from an Amanda tape onto the hard-drive by not using > Amanda. This is probably a "you don't know how to use tar properly" question > but: > > #mt -f /dev/rmt/0n status > Vendor 'SONY' Product 'SDX-300C ' tape drive: > sense key(0x6)= Unit Attention residual= 0 retries= 0 > file no= 0 block no= 0 > > #mt -f /dev/rmt/0n rewind > > I'm obviously doing something wrong here cause the command: > #dd if=/dev/rmt/0n bs=32k skip=1 | /usr/local/bin/tar -cv -f > /export/output.tar > /usr/local/bin/tar: Cowardly refusing to create an empty archive You're mixing your metaphors, I'm afraid. Either of the following should work 1) dd if=/dev/rmt/0n bs=32k skip=1 of=/export/output.tar This will create the tar file for you (hopefully you haven't compressed the tar file on tape - if you have, change to of=/export/output.tar.gz) and then you can use tar [tx]f (or [tx]zf if compressed) to list|extract the contents. 2) dd if=/dev/rmt/0n bs=32k skip=1 | tar xf - This will extract the tar file under the current directory for you. Use tar xzf if it was compressed, or tar tf (or tzf if compressed) if you just want to view the contents of the backup file. The command line you gave was a bit of a mix of both of the above and it was simply wrong. Kindest regards, Niall O Broin
Re: Restore from tape (not using Amanda) syntax
On Wed, Sep 25, 2002 at 09:38:55PM +1000, Gordon Cormack wrote: > Hi Peoples, > > I'm trying to dump from an Amanda tape onto the hard-drive by not using > Amanda. This is probably a "you don't know how to use tar properly" question > but: > > #mt -f /dev/rmt/0n status > Vendor 'SONY' Product 'SDX-300C ' tape drive: > sense key(0x6)= Unit Attention residual= 0 retries= 0 > file no= 0 block no= 0 > > #mt -f /dev/rmt/0n rewind > > I'm obviously doing something wrong here cause the command: > #dd if=/dev/rmt/0n bs=32k skip=1 | /usr/local/bin/tar -cv -f > /export/output.tar > /usr/local/bin/tar: Cowardly refusing to create an empty archive > > The tape only has about 2GB of compressed data on it so it's not huge... > > Any ideas? You haven't read/understood the layout of an amanda tape. An amanda tape consists of separate "tape files", administrative ones at the start and end of the tape, and individual "tape files" for the dump of each disk list entry. When you amlabel a tape, the first file is laid down identifying the tape. Guess how amanda knows what tape it is, it reads the first file. When you rewind and take the first data from the tape, you are trying to "untar", the amanda label, not a dump. Guess how big that file is, 32KB. Just the size you skipped. Thus tar's input is "empty", just as it says. You have to position the tape (using mt) at the beginning of a dump file. Other considerations: - why are you trying to "create" a tar archive (-c option)? don't you already have a tar archive on the tape that you want to extract? - did you use hardware or software compression? if the latter, you need a gzip -dc in that pipeline. - the first 32KB of each dump file (the header you are trying to skip over) contains a pretty close approximation of the command line you need to extract that dump file. To read the header, position the tape with mt and use your dd command without tar, changing skip to count. -- Jon H. LaBadie [EMAIL PROTECTED] JG Computing 4455 Province Line Road(609) 252-0159 Princeton, NJ 08540-4322 (609) 683-7220 (fax)
Re: Restore from tape (not using Amanda) syntax
Gordon, You've got several things wrong here. First, you didn't use mt to forward the tape to the beginning of a tape file. After your rewind command, try: mt -f fsf where number is the location of the tape file that you want to extract. Just for testing, pick 1. Second, your tar syntax isn't quite right. The -c tells tar to create an archive, which is not what you want. You want either -x to extract, or -t to list without extracting (good option to test with). The -f switch tells tar what file to create or read (depending on the previous -c or -x switch). You need to tell it to read from STDIN which is done with a '-', like so: 'tar -tvf -' Also, you don't include a pipe through gzip, which implies that your tape file is uncompressed. If you do compress your data (not hardware compression) then you also need to pipe you command through gzip, like so: dd if= bs=32k skip=1 | gzip -dc | tar -tvf - Alternatively, you can use the 'z' switch to GNU tar and it will pipe through gzip for you: dd if= bs=32k skip=1 | tar -tvzf - To make all of this easy, you can read the header at the beginning of each tape file, and it will tell you the command to extract: mt -f rewind mt -f fsf 1 dd if= bs=32k count=1 Be sure to rewind the tape again after you do that. Good luck! Anthony Valentine On Wed, 2002-09-25 at 03:38, Gordon Cormack wrote: > Hi Peoples, > > I'm trying to dump from an Amanda tape onto the hard-drive by not using > Amanda. This is probably a "you don't know how to use tar properly" question > but: > > #mt -f /dev/rmt/0n status > Vendor 'SONY' Product 'SDX-300C ' tape drive: > sense key(0x6)= Unit Attention residual= 0 retries= 0 > file no= 0 block no= 0 > > #mt -f /dev/rmt/0n rewind > > I'm obviously doing something wrong here cause the command: > #dd if=/dev/rmt/0n bs=32k skip=1 | /usr/local/bin/tar -cv -f > /export/output.tar > /usr/local/bin/tar: Cowardly refusing to create an empty archive > > The tape only has about 2GB of compressed data on it so it's not huge... > > Any ideas? > > Thanks, > Gordon. -- UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.
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RE: Restore from tape (not using Amanda) syntax
Title: RE: Restore from tape (not using Amanda) syntax Thanks again guys for your quick and informative responses. The main problem was the lack of coffee at 9:30pm onwards at night but essentially this command is what did it for me: dd if=/dev/rmt/0n bs=32k skip=1 | /usr/local/bin/tar -xv -f - Worked like a treat and I am now up-and-running once again! Thanks to all those who responded... Cheers, Gordon. -Original Message- From: Gordon Cormack Sent: Wednesday, 25 September 2002 9:39 PM To: [EMAIL PROTECTED] Subject: Restore from tape (not using Amanda) syntax Hi Peoples, I'm trying to dump from an Amanda tape onto the hard-drive by not using Amanda. This is probably a "you don't know how to use tar properly" question but: #mt -f /dev/rmt/0n status Vendor 'SONY ' Product 'SDX-300C ' tape drive: sense key(0x6)= Unit Attention residual= 0 retries= 0 file no= 0 block no= 0 #mt -f /dev/rmt/0n rewind I'm obviously doing something wrong here cause the command: #dd if=/dev/rmt/0n bs=32k skip=1 | /usr/local/bin/tar -cv -f /export/output.tar /usr/local/bin/tar: Cowardly refusing to create an empty archive The tape only has about 2GB of compressed data on it so it's not huge... Any ideas? Thanks, Gordon.
