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тАО01-04-2011 07:38 AM
тАО01-04-2011 07:38 AM
I am working on a DR script on a system that is in production 24x7.
system: rx3600
OS: HP-UX 11i version 3
I have two logical volumes
I am syncing about 45 Gigs of data from /dir1 to /dir2 and the sync is taking about 40 minutes with out coping any data. Because I the company has been on holiday for the past week none of the data on the production side /dir1, there have been no updates.
The command I am using is....
rsync -avcu --delete --stat /dir1/ /dir2/
How can I speed this process up or should I be looking for another solution?
Any help would be greatly appreciated!
Thanks,
Tim
Solved! Go to Solution.
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тАО01-04-2011 08:14 AM
тАО01-04-2011 08:14 AM
Re: rsync seems very slow between local volume groups
But I have to ask one question:did this same setup work faster in the past ? If it did, what happened since then ? If this is a new setup and you are not happy with the speed, the only thing you can do is a) if the disk are on the SAN, use a SAN frame based data replication utility of your choice (business copy for HP XP, or Business Continuity Volumes aka BCVs for EMC are some examples); b) if the disks are local, you can use UX-Mirror to create a mirror copy of the disk drive but I am not sure how this can be sued as a DR solution.
UNIX because I majored in cryptology...
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тАО01-04-2011 08:25 AM
тАО01-04-2011 08:25 AM
Re: rsync seems very slow between local volume groups
You will be better off using vxdump/vxrestore (if your filesystems are vxfs) or fbackup/frestore.
You may also want to look at using LVM Snapshots and pvmove.
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тАО01-04-2011 08:27 AM
тАО01-04-2011 08:27 AM
Re: rsync seems very slow between local volume groups
Both logical volumes are local and mirrored, so let me explain my logic which could have flaws in it.
Production is running 24x7 so my best bet to get a clean copy of the data is to...
1) pause the database engine
2) rsync the data to another file system
3) enable the database engine
4) transfer the synced data off site
Because it is taking so long to sync the database I cannot pause the database engine for that amount of time. So I modified my logic to the following.
1) pause the database engine
2) break the mirror on lvol1
3) enable the database engine
4) rsync lvol1 to lvol2
5) merge the mirror on lvol1
6) transfer the synced data off site.
I would like to keep the mirrors broke as short of time as possible.
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тАО01-04-2011 08:29 AM
тАО01-04-2011 08:29 AM
Re: rsync seems very slow between local volume groups
Then yo can ship out those RMAN files offsite
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тАО01-04-2011 08:31 AM
тАО01-04-2011 08:31 AM
Re: rsync seems very slow between local volume groups
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тАО01-04-2011 08:33 AM
тАО01-04-2011 08:33 AM
SolutionYears ago, during a SAN migration exercise, we have gained abiout 2.5 times speed advantage using vxdump/vxrestore over doing a plain cp (which is what rsync basically is) but this was a special case to our setup, using an EMC source array and XP1024 as a target. So, your mileage may vary.
UNIX because I majored in cryptology...
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тАО01-04-2011 08:33 AM
тАО01-04-2011 08:33 AM
Re: rsync seems very slow between local volume groups
The file systems are vfxs and are both local.
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тАО01-04-2011 08:35 AM
тАО01-04-2011 08:35 AM
Re: rsync seems very slow between local volume groups
UNIX because I majored in cryptology...
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тАО01-04-2011 08:45 AM
тАО01-04-2011 08:45 AM