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тАО07-24-2002 10:05 AM
тАО07-24-2002 10:05 AM
mirroring
thnxs for you help
michael
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тАО07-24-2002 10:12 AM
тАО07-24-2002 10:12 AM
Re: mirroring
As a rule HW mirroring is better than SW mirroring. But in this case both are SW mirroring.
So I'd prefer the mirroring be done as close to the OS as possible - in your case LVM would be my choice. For the simple reason that the kernel can keep tabs on LVM.
You'd have to show me hard, realistic data to convince me that a vendor's mirroring scheme would perform better with the same/better level of integrity that I know I can get w/LVM.
My 2 cents,
Jeff
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тАО07-24-2002 09:56 PM
тАО07-24-2002 09:56 PM
Re: mirroring
My situation is just the same as you. But my DB is PROGRESS. I use MirrorDisk/UX.
I also think the O/S SW mirror is better because the system itself integrate with it. I am not sure whether Sybase's mirror can have a good performance!
-Live as you wish-
Gerald Zhou
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тАО07-24-2002 10:22 PM
тАО07-24-2002 10:22 PM
Re: mirroring
Regards,
Trond
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тАО07-24-2002 11:34 PM
тАО07-24-2002 11:34 PM
Re: mirroring
Not knowing too much about sysbase I cannot comment about efficiency etc. but HP will have tuned LVM mirroring for HP hardware can you be sure that Sybase have done the same?
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тАО07-25-2002 10:01 AM
тАО07-25-2002 10:01 AM
Re: mirroring
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тАО07-25-2002 10:25 AM
тАО07-25-2002 10:25 AM
Re: mirroring
Eventually, we went to hardware mirroring with EMC drives.
HTH
Marty
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тАО07-25-2002 10:49 AM
тАО07-25-2002 10:49 AM
Re: mirroring
I've actually had to do both HW & SW mirroring on a VG PV before.
Had an existing mirrored VG that resided on a Jamaica that needed to grow & there was no more space nor PVs available anywhere for this system except for it's EMC.
User did not want ANY downtime so I was forced to extend the VG out to the EMC where it happily gobbled up 8GB of actual diskspace to get the 4Gb of LUNs that LVM was going to *strictly* enforce on it to get the 2Gb of volume extension.
Bet if we'd been charging the cust for actual diskspace occupied back then they would have given me the outage to do it right. :~)
Cheers,
Jeff