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тАО03-08-2006 08:46 AM
тАО03-08-2006 08:46 AM
Re: StorageWorks Dat 72 problems
Backed up the same folder with 2gb of data the following ways using Veritas v9.1:
Compress set to None 1.062:1
Compress set to Software 1.045:1
Compress set to HW else none 1.104:1
Compress set to HW else SW 1.077:1
I then tried Windows Backup, but due to other circumstances it failed, so I went back to Veritas. Windows BU had renamed the tape to Seagate with today date. The tape was named named 4MMxxxxxxx. Weird. I left it like that and started a full system backup. I checked the media and it said compression 1:1. So I let it run while I checked other settings in various places, found nothing wrong. I stopped the tape after 15 minutes because the tape wasn't going to hold everything anyway. After it stopped it showed media compression at 1.775:1 !! It may be working now, the server won't do another full backup until tonite.
Where can I find documentation of compression ratios of different file types? This server has many large powerpoint, avi, mjpg, gpraphics file types. Some powerpoint presentations are over 300MB. A very large portion of the files contain some some sort of graphics in them.
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тАО03-08-2006 08:57 AM
тАО03-08-2006 08:57 AM
Re: StorageWorks Dat 72 problems
Those links are for backing up to a folder not to tape. The compression setting are located in same place for either method.
I do find it intersting at the end when you said "Restart Veritas BackupExec for the changes to take effect". Do you mean close & reopen BEXEC, or the services themselves?
Not everytime did I close & reopen. Never did I restart any services. Hhhhmmmmmmm. I wonder........
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тАО03-08-2006 09:28 AM
тАО03-08-2006 09:28 AM
Re: StorageWorks Dat 72 problems
Now, the cause of the poor compression is due probably to your data.
Nowaday all the OS use to optimize filesystem, and same for the various application that create files, media files are already highly compressed and cannot be more compressed, and if you try to compress them, you will have more overhead than benefit, and you will go under 1:1
I would suggest you a system to identify if the cause are the data: start LTT, and go in the system performance tab, then run the prerestore data test, selecting a set of data with 2:1 compression. This will create you a amount of data with a well known comprimable ratio. THen try to backup these data, and check the result, should be 2:1.
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тАО03-08-2006 11:23 AM
тАО03-08-2006 11:23 AM
Re: StorageWorks Dat 72 problems
This is indeed getting interesting. Stop all the backup services and restart them. Do let me know if it is of any help.
Thanks
Satish
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тАО03-09-2006 02:46 AM
тАО03-09-2006 02:46 AM
Re: StorageWorks Dat 72 problems
All of the standard media formats are already highly compressed as a part of the MPEG/JPEG/AVI format. This is why you may see an increase in size on those type files. Even in lossless formats like MPEG-1 and WAV, the files are compressed using a ZIP type algorithm when the file is created, so trying to compress it again only adds overhead to the file.
Josh
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тАО03-10-2006 02:26 AM
тАО03-10-2006 02:26 AM
Re: StorageWorks Dat 72 problems
Satish: I will also remember to restart the services after any new config change.
Joshua: I crunched some numbers from 1 partition: The average file size comes to 1.2MB. I can believe that. (23+ GB divide by 19396 files)
The last data only backup had a compression result of 0.935:1 . You have all helped very much with my problem. All the latest suggestions are going to take time.
Can anybody spell "Archive" !! ?
If they don't want to archive (may not be convenient) and if everything turns out to be a result of the data type and its compression capabilities, what type of backup hardware would you recommend? I have only worked with DDS tapes/HW before, so what is the next step up?
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тАО05-04-2006 12:49 AM
тАО05-04-2006 12:49 AM
Re: StorageWorks Dat 72 problems
I had this same issue on a couple DL380s with a hotswap Dat72 and the one with Veritas was not compressing and the one without veritas was compressing fine. So it is something to do with Veritas. We are running Veritas 10 and 10d.
To fix the 1 server we did several things but not sure what fixed it. I stopped veritas services stopped the tape backup service opened the tape tools and did a compression test. It never asked me to enable like some guy mentioned. Well we closed that and opened veritas enabled the service and logged in and right clicked on the tape drive and made sure compression was on. We then went into tools and options and Backup Compression type Hardware if avalible otherwise software. We then made sure the job was set the same. We then checked and no luck.. we then swapped the hot plug drives from the server without veritas to this one and well it was amazing and it found the new drive and walah the compression was enabled. It was the weirdest thing but hey it worked. We even rebooted and it stayed. So we deleted the old tape drive in veritas and it is still working.
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тАО05-07-2006 01:54 PM
тАО05-07-2006 01:54 PM
Re: StorageWorks Dat 72 problems
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