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тАО04-12-2006 09:18 PM
тАО04-12-2006 09:18 PM
backup very slow
we using tape array 5300 in rp4440 server actually we had to take backup only 250gb size but it taking very long time like 9 hrs for to be completed 30 or 40 %, and we are using vxdump command file system is vxfs and drive speed is 80 gb/hrs.
command is
vxdump -0uf /tapepath /filesystem
so please anybody give me solution for taking back up as much as fast
thanks
siva
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тАО04-13-2006 04:39 AM
тАО04-13-2006 04:39 AM
Re: backup very slow
You can test your device speed by using:
dd if=/dev/zero of=/tapepath bs=8192 count=131072
This will save to tape 1 GB. You can use iostat to check the throughput.
You can also use LT&T to test the device.
Finally, ensure that you are not getting errors on the system log.
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тАО04-13-2006 04:59 PM
тАО04-13-2006 04:59 PM
Re: backup very slow
What are you running for an OS? Is it OpenVMS?. Also I know this sounds trivial, sincee the drives are hot swap, try to reseat the drive and see if this is of any help whatsoever. And ofcourse, depending on your OS you can download Library and Tape Tools Diagnostic from www.hp.com/support/tapetools.
Also could you pleas elaborate on the nature of the data/information that is being backed.
Thanks
Satish
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тАО04-13-2006 10:56 PM
тАО04-13-2006 10:56 PM
Re: backup very slow
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тАО04-17-2006 02:13 AM
тАО04-17-2006 02:13 AM
Re: backup very slow
1. What kind of tape drive are you using?
2. Is it reallyrated at 80 GB/hour? And is this "compressed"?
3. What kind of filesystem are you backing up? Fewer large files or millions of smaller files?
Depending on your tape drive's capability - you may want to try using a blocking factor to your vxdump command like so:
vxdump 0ubf 512 /dev/rmt/1mn /filesystem
You may also want to play around with media density and size arguments to vxdump. See "man vxdump"
HTH.