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тАО02-24-2006 08:46 AM
тАО02-24-2006 08:46 AM
I am currently running an image backup on local SCSI drives on my VMS server. As for image backup, does it slow down the backup if you come across files that currently opened, even if you if the qualifiers /ignore=(label, inter)?? As I watched the backup log, I noticed the backup procedure slow down when it came across certain log files.
Should I skip log files altogether? If so, what's the qualifier to this?
Thank you in advance.
J
Solved! Go to Solution.
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тАО02-24-2006 09:32 AM
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тАО02-24-2006 09:34 AM
тАО02-24-2006 09:34 AM
Re: VMS Image backup
Pls go thru this link which talks about "VAX/VMS 7.2 BACKUP/IMAGE behavior when a file is open"
http://groups.google.com/group/comp.os.vms/browse_frm/thread/75a3301e76ac309f/cf7b2d574f2c67ec?lnk=st&q=VMS+image+backup+open+log+slow&rnum=1&hl=en#cf7b2d574f2c67ec
Archunan
Archie
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тАО02-24-2006 09:49 AM
тАО02-24-2006 09:49 AM
Re: VMS Image backup
When you said you are looking at the log files, are you running a batch job and doing a type/tail on the log file or are you doing the image backup interactively?
Also, one other question, What is the configuration of the disk drives that you are backing up. Are they shadowed on the system (i.e. DSAnnn:). If you are backing up shadow sets then all you need to do is remove one member of the shadow set and backup it then place if back into the shadow set. You create a vulnerability to disk drive failure for a period of time that the shadow set is reduced for the backup but you will not have to stop any applications or users to get a clean backup.
Phil
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тАО02-24-2006 10:07 AM
тАО02-24-2006 10:07 AM
Re: VMS Image backup
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тАО02-24-2006 11:01 AM
тАО02-24-2006 11:01 AM
Re: VMS Image backup
You can improve the backup performance by properly setting the process quotas for the process from which backups will be made.
WSQUOTA 16384
WSEXTENT Greater than or equal to WSQUOTA
PGFLQUOTA 32768
FILLM 128
DIOLM 4096
ASTLM 4096
BIOLM 128
BYTLM 65536
ENQLM 256
Our system mngr manula suggest above values, so make sure you have these approximate values (not exact). Ans as I said earlier, the best way to do the image backup is without any intercative users.
Also as you have SCSI cont, that automatically will do some
degree of optimization even if the files are open during the Backup operation in the way of orderily selecting the directory files and the reading the files from the optimised way.
Archunan
Archie
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тАО02-24-2006 11:18 AM
тАО02-24-2006 11:18 AM
Re: VMS Image backup
See the current manual at:
http://h71000.www7.hp.com/doc/82FINAL/aa-pv5mj-tk/aa-pv5mj-tk.HTMl
Here is a snippet of our procedure which creates the backup related accounts (sorry I have only the dieted version available):
$WsMax=f$gets("wsmax")
$Virtual=F$Getsyi("VirtualPagecnt")
$ChannelCnt=F$Getsyi("ChannelCnt")
$wsquota=WsMax/2
$If (WsQuota.gt.32768) Then $ WsQuota=32768
$wsextent=WsMax
$Pgflquota=100000
$If (Pgflquota.lt.WsQuota+25000) Then $ Pgflquota=WsQuota+25000
$Fillm=128
$If (Fillm.gt.ChannelCnt-20) Then $ Fillm=Channelcnt - 20
$Diolm=150
$Astlm=1000
$Biolm=1000
$Bytlm=(512*Fillm)+(6*Diolm)+10000
$If (Bytlm.le.100000) Then $ Bytlm=100000
$Enqlm=1000
regards Kalle
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тАО02-24-2006 05:34 PM
тАО02-24-2006 05:34 PM
Re: VMS Image backup
$SET FILE/NOBACKUP filename
This will make the IMAGE backup copy the file header, but not the data. If you need to back up the contents of the log file, you could possibly do it separately later and use IGNORE=NOBACKUP in order to backup the data.
Allan in Atlanta
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тАО02-24-2006 08:36 PM
тАО02-24-2006 08:36 PM
Re: VMS Image backup
For those type of log files it is best if the application can set a large extend size.
If fragmentation of growing files _IS_ an issue (which it usually is if there are growing files) you shoud modify the disk extend size.
NO need to modify any application, and can be done on the fly. Effective for any files created thereafter.
$ SET VOLUME
When the file is closed, any too large allocation is truncated back (as it is now),
so not much waste of diskspace.
hth
Proost.
Have one on me.
jpe
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тАО02-25-2006 02:25 AM
тАО02-25-2006 02:25 AM
Re: VMS Image backup
I'm curious as to what you mean by "the backup procedure slows down?"
Are you backing up to tape and you notice that the amount of tape motion decreases? Or are you noticing that the rate at which file names are being logged is decreased?
The reason I ask is that when BACKUP hits a larger file, the rate of logging will decrease since it takes longer to copy the contents of a big file than a small one. However, the rate of transfer of data to the output device usually doesn't drop significantly unless there is a very bad file fragmentation, or competition for I/O or compute resources on the system that would affect the performance of the process running BACKUP.
So, could you please explain what you mean about the procedure slowing down?
Thanks,
Robert