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тАО07-22-2009 05:33 AM
тАО07-22-2009 05:33 AM
Presenting LUN to 2nd server as read only?
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тАО07-22-2009 06:31 AM
тАО07-22-2009 06:31 AM
Re: Presenting LUN to 2nd server as read only?
1.: some file systems cannot be mounted read-only
2.: the read-only view is not 'stable' (as the R/W sever is making constant changes) which can result in pretty bad file system inconsistencies.
See if your storage array can provide crash-consistent snapshots at least (required if database span multiple disks).
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тАО07-22-2009 06:40 AM
тАО07-22-2009 06:40 AM
Re: Presenting LUN to 2nd server as read only?
We have an EVA4000 with business copy, but are only licensed for 1tb at the moment. This is only an interim solution so will look into alternatives rather than the Read only
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тАО07-22-2009 10:15 AM
тАО07-22-2009 10:15 AM
Re: Presenting LUN to 2nd server as read only?
don't do that... This "feature" is only used in some rare situations (cluster extension for example). It will not solve you problems. NTFS can't be cleanly mounted read-only. Windows will try to write some data to the MFT and will report errors, that filesystem can't be written.
Best regards,
Patrick
Patrick
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тАО07-22-2009 07:29 PM
тАО07-22-2009 07:29 PM
Re: Presenting LUN to 2nd server as read only?
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тАО07-22-2009 10:06 PM
тАО07-22-2009 10:06 PM
Re: Presenting LUN to 2nd server as read only?
Last time I checked, an EVA cannot present a single virtual disk to one host R/W and to another host R/O, because the RW/RO switch is a characteristic of the whole virtual disk. And even if it were possible, you still have the consistency problem I mentioned.
Don't know why you bring up CLX, access to the destination disk is usually blocked - see the "-forceflag" documentation.