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тАО03-02-2009 08:06 AM
тАО03-02-2009 08:06 AM
We've a cluster of ES80's, OpenVMS v7.3-2 running Oracle 8 & 9. SAN & disks on HSG80's. Just added some disks - have now spotted they're WRITE-BACK enabled, & the Oracle team want WRITE-THROUGH. The SET VOLUME/WRITETHROUGH will do this - are there any risks? Want to be really sure that it's o.k. to just issue command etc.
Thank you.
Solved! Go to Solution.
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тАО03-02-2009 08:53 AM
тАО03-02-2009 08:53 AM
Re: OpenVMs v7.3-2 | Cluster+Oracle| Write back to Write-through
are you using Pathworks on this cluster ?
Did you read $ HELP SET VOLUME/WRITETHROUGH
This feature only affects Pathworksa d allows . The File Cache (XFC) is still writethrough anyway.
Volker.
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тАО03-02-2009 09:26 AM
тАО03-02-2009 09:26 AM
Re: OpenVMs v7.3-2 | Cluster+Oracle| Write back to Write-through
Thanks for the reply - yes, I had read the help information.
However, that doesn't answer my question, which was can I issue the command on the fly, without causing a problem. My application is Oracle, rather than Pathworks.
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тАО03-02-2009 09:33 AM
тАО03-02-2009 09:33 AM
Re: OpenVMs v7.3-2 | Cluster+Oracle| Write back to Write-through
You've made me re-read the Help, so actually the show /device/full output isn't meaningfull, as XFC sits in front of the disk anyway and as that's write-through it doesn't matter.
Which means it doesn't matter what write-blah this disk is in... I think that does answer my question.
Thank you Volker!
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тАО03-02-2009 04:35 PM
тАО03-02-2009 04:35 PM
Re: OpenVMs v7.3-2 | Cluster+Oracle| Write back to Write-through
What you want is write thru on the HSG controllers - right?
Then you need to connect to the HSG and do it there, can't be done direct from VMS.
BTW, as an aside, there was a rumour about 10 years ago that write thru cache and Oracle didn't mix, but that turned out to be a mix-up between Oracle and (then) Digital pre-sales folk. Oracle and write thru are fine.
have fun
PJ
Peejay
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If it can't be done with a VT220, who needs it?
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тАО03-02-2009 10:46 PM
тАО03-02-2009 10:46 PM
Re: OpenVMs v7.3-2 | Cluster+Oracle| Write back to Write-through
You should be focused on the HSG and not
on the operating system. Oracle marks all
I/O NOCACHE so it bypasses all O/S caching
completely.
Enabling write back on the HSG should be
okay assuming you have a battery to backup
the HSG cache.
If this reply does not answer your question
let me know.
Guy Peleg
Maklee Engineering
http://www.maklee.com
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тАО03-04-2009 05:54 AM
тАО03-04-2009 05:54 AM
Re: OpenVMs v7.3-2 | Cluster+Oracle| Write back to Write-through
Yes, we have battery backup on the HSG's - and all are working.
My customer wants the disk to be (from OpenVMS) mounted /WRITETHROUGH - so can I do a simple SET VOL/WRITETHROUGH with the disk 'live' and mounted in the cluster?
I believe I can do this, as it's a valid command, and VMS rarely allows you to do something that'll screw up a working system.
But I'm after validation.
Thank you.
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тАО03-04-2009 06:11 AM
тАО03-04-2009 06:11 AM
SolutionNo need to re-mount.
$ ld connect lda4.disk lda4:
$ moun/over=id lda4:
%MOUNT-I-MOUNTED, LDA4 mounted on _$8$LDA4: (TD183)
$ pipe show devi lda4:/full | searc sys$pipe write
write-back caching enabled.
$ set volu/write lda4:
$ pipe show devi lda4:/full | searc sys$pipe write
write-through caching enabled.
It's not going to make a difference, other than make an insufficiently informed happy.
Write-through is indeed what is needed for Oracle, but it is already happening.
Write-through is was Oracle explcitly requests for the data anyany, as Guy already mentions.
Write-through through is what everyone gets anyway, data and file system info (headers).
I should perhaps re-investigate, but best I recall the Write-back setting does not turn that on, it just allows applications to request it, if they know how.... Pathworks used to know how.
Go for it!
Hein.
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тАО03-06-2009 10:00 AM
тАО03-06-2009 10:00 AM