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тАО07-08-2007 09:42 PM
тАО07-08-2007 09:42 PM
Fbackup
Hello All,
Can anybody confirm me that fbackup taken through SAM is compressed or not.
If not is there any option expect from hardware.
Regards,
Paramvir Bhardwaj
Can anybody confirm me that fbackup taken through SAM is compressed or not.
If not is there any option expect from hardware.
Regards,
Paramvir Bhardwaj
3 REPLIES 3
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тАО07-08-2007 09:54 PM
тАО07-08-2007 09:54 PM
Re: Fbackup
Hi,
it depends to your configuration.
Compression is only set by choosing the right device file.
Check /dev/rmt:
Ending with 'BEST' is with compression.
Either you choose this one in SAM or see if '0m' is configured like '*BEST'.
For example at my server:
crw-rw-rw- 2 bin bin 205 0x020000 23. Juli 2004 0m
crw-rw-rw- 2 bin bin 205 0x020000 23. Juli 2004 c2t0d0BEST
So I can choose either c2t0d0BEST or 0m, both will compress.
crw-rw-rw- 1 bin bin 205 0x020001 23. Juli 2004 c2t0d0DDS - will not compress.
HTH
Volkmar
it depends to your configuration.
Compression is only set by choosing the right device file.
Check /dev/rmt:
Ending with 'BEST' is with compression.
Either you choose this one in SAM or see if '0m' is configured like '*BEST'.
For example at my server:
crw-rw-rw- 2 bin bin 205 0x020000 23. Juli 2004 0m
crw-rw-rw- 2 bin bin 205 0x020000 23. Juli 2004 c2t0d0BEST
So I can choose either c2t0d0BEST or 0m, both will compress.
crw-rw-rw- 1 bin bin 205 0x020001 23. Juli 2004 c2t0d0DDS - will not compress.
HTH
Volkmar
*** Say 'Thanks' with Kudos ***
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тАО07-09-2007 12:05 AM
тАО07-09-2007 12:05 AM
Re: Fbackup
As mentioned, fbackup does not control compression, the device file enables compression. There are very few device files in /dev/rmt that are NOT setup for compression. To see the options for each device file, use lssf:
lssf /dev/rmt/*
If you are using /dev/rmt/0m, then it is compressed -- the words "best density available" means that this device file will enable compression. NOTE: compression is only effective with highly repetitive patterns such as massively large text files and partially filled databases. A backup of just vg00 will average about 1.2:1 to 1.6:1 compression, nowhere near to the 'marketing' value for tape drives which is 2:1. If you plan for the only native capacity of the tape, then you won't be disappointed.
Bill Hassell, sysadmin
lssf /dev/rmt/*
If you are using /dev/rmt/0m, then it is compressed -- the words "best density available" means that this device file will enable compression. NOTE: compression is only effective with highly repetitive patterns such as massively large text files and partially filled databases. A backup of just vg00 will average about 1.2:1 to 1.6:1 compression, nowhere near to the 'marketing' value for tape drives which is 2:1. If you plan for the only native capacity of the tape, then you won't be disappointed.
Bill Hassell, sysadmin
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тАО01-20-2011 02:52 PM
тАО01-20-2011 02:52 PM
Re: Fbackup
Thanks.....
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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