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тАО09-10-2003 07:09 AM
тАО09-10-2003 07:09 AM
we have couple of oracle databases that we cold-backp (shutdown, backup,startup) every week night.
I am currently using "fbackup" and a DDS3 tape drive to backup.
The backup size is currently around 10GB and increasing. Backup now is taking about 2:30 hours and during that time my dbs are down. My question is,
Are there any other backup methods, softwares, hardwares etc. we can use to speed up this process??
TIA,
Rao
Solved! Go to Solution.
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тАО09-10-2003 07:13 AM
тАО09-10-2003 07:13 AM
Re: How to Speed up the backup process
If the database is on RAID 1 mirror, you can use lvsplit to break the mirror after database shutdown and then bring the database back up on the original.
You then copy the data off the mirror to a /backup filesysem.
While the database is up, you can rebuild the mirrors.
If you have lots of money, you can install a fiber card and use a Storage area network to run backups at a higher transfer rate.
If the backup is running through a NIC card, you can structure it so it runs on one machine, that increases throughput.
You can replace your dds3 tape drive with an Ultrium tape drive (around $5000) and get better tape througput via LVD SCSI.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО09-10-2003 07:15 AM
тАО09-10-2003 07:15 AM
SolutionUpgrade options for it are;
DDS4
SuperDLT (much better than DLT4/7/8000)
Ultrium
We use the Ultrium drives as they are the quickest available and store huge amounts of data (over 400GB).
Fow now have your tried optimizing your backup with an fbackup config file - this can help a lot. Use it with the fbackup -c option. Heres what weve found to be the best options in our config file;
blocksperrecord 128
records 32
checkpointfreq 256
readerprocesses 4
maxretries 1
retrylimit 0
maxvoluses 1000
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тАО09-10-2003 07:18 AM
тАО09-10-2003 07:18 AM
Re: How to Speed up the backup process
Assuming money is no object, I would have to recommend faster tape drives and a more robust backup software package, like OmniBack (or DataProtector - whatever they're calling it now).
Your dds3 drive does about 3.6 GB per hour according to specs and that looks about right given your 2.5 hour backup time. Switching to a DLT8000 drive would give you 21.6GB per hour, or roughly a 6X performance improvement. You can find DLT7000 and DLT4000 drives on the used market for reasonable prices and they will give you roughly a 4X and 2X performance gain, respectively.
The only thing with these faster drives is that you need the software, like OBII, to be able to provide data fast enough to keep the drive streaming. If you don't get enough data fast enough, the drives spend more time backing up and relocating than they do actually writing data.
Pete
Pete
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тАО09-10-2003 07:34 AM
тАО09-10-2003 07:34 AM
Re: How to Speed up the backup process
Now, it goes back to the budget you would have/ you can get.
Hope people don't wait on major pb before they put money into backup.
We use OBII (sorry Data Protector).
We moved recently from DLT7000 (5 years !) to UltriumII for both speed and storage capacity.
Rgds,
JL
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тАО09-10-2003 08:00 AM
тАО09-10-2003 08:00 AM
Re: How to Speed up the backup process
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тАО09-10-2003 08:26 AM
тАО09-10-2003 08:26 AM
Re: How to Speed up the backup process
We use them here. If you can keep the fiber channel saturated with data (depends on RAM and CPU Mhz), you can backup your 10GB in under half an hour (prolly 10 minutes). The tapes are pricey also, at $90/each. We use them here, and are delighted at their capacity and speed. As in all things: you get what you pay for. This is one of the best tapes out there, so expect to pay a bunch.
Chris
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тАО09-11-2003 05:59 AM
тАО09-11-2003 05:59 AM
Re: How to Speed up the backup process
My configuration requires about 5 minutes total database down time and that is consumed by the process of shutting down the database, splitting the BCV and restarting the database. The BCV is synchronized just prior to all this but that does not effect DB uptime as it is done in background while everything is running. Then when the DB is shutdown, the BCV contains a consistent copy which is then backed up to tape after the BCV split.
Of course you have to have a setup similar to the EMC Symetrix or Clariion to do this. This can require some deep pockets to get going.
Good luck with your project.
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тАО09-11-2003 06:15 AM
тАО09-11-2003 06:15 AM
Re: How to Speed up the backup process
Since DDS3 is fairly old technology, you may have a fairly old (and slow) CPU and disk setup, so jumping forward to something like a DLT 8000 or Ultrium tape drive may actually slow the backup to a crawl because your computer and disks cannot keep these very fast devices busy. Because they are streamers (like your DDS3), they must always have more data than they can use to keep moving at all times. Once the tape drive runs out of data due to a slow CPU and/or disks, the tape must be stopped, reversed, re-synced and start streaming again--which takes a long time (seconds) during which time the data backup rate is ZERO bytes per second.
So if you are running an E-series (E25, E35, etc), a D-series (D200, D350, etc) or a K-series (K100, K200, etc), your needs may have simply exceeded the capacity of the old hardware. A replacement rp-series computer will actually be cheaper than your original box yet run 3 to 8 times faster, and will support the high speed devices.
Bill Hassell, sysadmin
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тАО09-11-2003 07:08 AM
тАО09-11-2003 07:08 AM
Re: How to Speed up the backup process
When we upgrade our L2000, should be soon, I can look for more robust solution. Thanks again for the responses.
Rao
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тАО09-11-2003 12:23 PM
тАО09-11-2003 12:23 PM
Re: How to Speed up the backup process
Setup a enterprise backup environment and using GB network switch/interface.
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тАО04-11-2006 03:39 AM
тАО04-11-2006 03:39 AM
Re: How to Speed up the backup process
blocksperrecord 256
records 32
checkpointfreq 1024
readerprocesses 6
maxretries 5
retrylimit 5000000
maxvoluses 200
filesperfsm 2000