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тАО01-25-2011 10:43 PM
тАО01-25-2011 10:43 PM
SolutionSo you either have a problem with the drive itself (bad?) or the cables/terminators (bent pin?).
Check the hardware.
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО01-26-2011 04:13 AM
тАО01-26-2011 04:13 AM
Re: how to use streamer
You are right. Problem was with cable. Now ioscan -f shows me my tape
# ioscan -f | grep "Ultrium"
tape 0 0/2/1/0.0.0 stape CLAIMED DEVICE HP Ultrium 3-SCSI
So, is there book\manual how to use it? direct link to hp doc i mean.
I wanted to know how can i determine device file fr my tape? i check /dev and saw rmt and rtape, which one is mine?
I just rewind and check streamer and tape. I have card Ultrium 800 GB* data cartridges and found compatibility for them.
Tape drive model: Ultrium 920
read/write
(C7973A)
nl
write once/read
many (C7973W
Does it mean that i can write once to my cartridge? so i cant write some test files?
Regards,
Rustam
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тАО01-26-2011 04:34 AM
тАО01-26-2011 04:34 AM
Re: how to use streamer
# ioscan -fnCtape
I don't think the media is a WORM, so you can write many times.
Consider to use tar, pax, cpio or something to backup your data (depends on what you want to backup).
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО01-26-2011 06:02 AM
тАО01-26-2011 06:02 AM
Re: how to use streamer
# ioscan -fnCtape
Class I H/W Path Driver S/W State H/W Type Description
=====================================================================
tape 0 0/2/1/0.0.0 stape CLAIMED DEVICE HP Ultrium 3-SCSI
/dev/rmt/0m /dev/rmt/c0t0d0BEST
/dev/rmt/0mb /dev/rmt/c0t0d0BESTb
/dev/rmt/0mn /dev/rmt/c0t0d0BESTn
/dev/rmt/0mnb /dev/rmt/c0t0d0BESTnb
there are 4 types 'devise file' such as 0m, 0mb, 0mn, 0mnb. Honestly i dont know differ between them. On manual is rmt/0mnb
2. Back up /stand/vmunix to tape:
% tar cvf /dev/rmt/0m ./stand/vmunix
>>I don't think the media is a WORM, so you >>can write many times.
how can i determine does mine WORM or doesnt? i have 10 Data cartridge - 'HP LTO3 Ultrium RW' * Assuming 2:1 Compression.
Does RW mean i can write and read many times?
>>Consider to use tar, pax, cpio or >>something to backup your data (depends on >>what you want to backup).
On my servers run Oracle Database and backups are created with Datapump Utility, not with RMAN. So i have dump files of my database, size app 30Gb (each file). During a day i have to write these dump files (3 dump files from 3 instance) to cartridge and all archive logs from one instance. So which way is secure, faster and easier to these tasks?
By the way, i have never worked with tapes\data cartridges, can i create several directories with data (automatically) or manually?
I also have HP LTO Ultrium Universal Cleaning Cartridge, havent known yet for what i can use it.
Regards,
Rustam
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тАО01-26-2011 06:16 AM
тАО01-26-2011 06:16 AM
Re: how to use streamer
>> Does RW mean i can write and read many times?
Yes.
Regarding cleaning: Insert the cleaning tape if the "clean" LED is on.
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО02-02-2011 02:26 AM
тАО02-02-2011 02:26 AM
Re: how to use streamer
>>Refer to your oracle documentation on how >>to backup date.
I found out that tar and cpio will be ok for my data pumps.
>>Regarding cleaning: Insert the cleaning >>tape if the "clean" LED is on.
Ok, i got it. Thanks.
Look, i follow official documents and make some test backup and extract to/from cartridge.
1. i copy to /tmp test file and then write it to my data cartridge.
# tar cvf /dev/rmt/0mn /tmp/p8202632_10205_WINNT.zip
a /tmp/p8202632_10205_WINNT.zip 2119612 blocks
# mt status
Drive: HP Ultrium 3-SCSI
Format:
Status: [81114400] EOF online compression immediate-report-mode
File: 1
Block: -1
# cd /tmp
2. delete my test file p8202632_10205_WINNT.zip from /tmp. Then would copy from data cartridge to /tmp. But got error, why?
# tar xvf /dev/rmt/0mn
Tar: blocksize = 0; broken pipe?
what was wrong? How can i write and read from data cartridge then? Only way to write big file (which has 10-20-30Gb) to cartridge is to spread big file to multipal files?
Regards,
Rustam
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тАО02-02-2011 02:39 AM
тАО02-02-2011 02:39 AM
Re: how to use streamer
IMHO it should work then.
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО02-02-2011 02:47 AM
тАО02-02-2011 02:47 AM
Re: how to use streamer
>Status: [81114400] EOF online compression
>Then would copy from data cartridge to /tmp. ...
>what was wrong?
As mentioned by "mt status", you are at EOF and you need to rewind the tape so you see "BOT":
mt rew
>Only way to write big file (which has 10-20-30Gb) to cartridge is to spread big file to multiple files?
No, you can use pax(1) instead of tar.
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тАО02-02-2011 06:01 AM
тАО02-02-2011 06:01 AM
Re: how to use streamer
Thank you a lot. Finally i could write and then read my test file to\from cartridge.
But I still dont know, what differ between these files: /dev/rmt/0m /dev/rmt/0mb /dev/rmt/0mn /dev/rmt/0mnb. Couldnt find in official doc. I guess each of them have specific feature during write\read. So i dont know which is to good to use.
Thanks Dennis,
This evening i will read and then try to practice with pax utility.
Regards,
Rustam
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тАО02-02-2011 06:20 AM - last edited on тАО08-08-2011 12:05 PM by Kevin_Paul
тАО02-02-2011 06:20 AM - last edited on тАО08-08-2011 12:05 PM by Kevin_Paul
Re: how to use streamer
many related threads are there, for example:
http://h30499.www3.hp.com/t5/System-Administration/0m-vs-0mb/m-p/3098949#M146522
Hope this helps!
Regards
Torsten.
__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.
__________________________________________________
No support by private messages. Please ask the forum!
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