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тАО06-26-2007 04:31 AM
тАО06-26-2007 04:31 AM
I continue to get NTFS errors, (Event ID 55) with data corruption, but no apparent data loss. This always requires a reboot with an offline CHKDSK operation. This fixes it, but the problem returns within a few days.
Currently there is light usage of any of the servers, but that is about to change, and I need to track down this problem. I have not been able to create the problem myself, and cannot pinpoint any particular process that is causing the errors.
I would appreciate any advice on this problem!
Thanks
Solved! Go to Solution.
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тАО06-26-2007 04:40 AM
тАО06-26-2007 04:40 AM
Re: MSA 500 G2 with 4 nodes
Can you let us know what is your LUN Raid level, your multipathing software (securepath etc, and it's version).
How do you zone the SAN switch and SSP on the MSA?
Is this 2 LUN is shared between this 4 servers??
Regards,
Sandy
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тАО06-26-2007 04:49 AM
тАО06-26-2007 04:49 AM
Re: MSA 500 G2 with 4 nodes
I am not running the Multipath Software because it is not setup Multi-Path.
There are two volumes set up, and all 4 nodes can see both volumes.
Not sure what you mean by Zoning. I do not have SSP enable right now, but am considering it.
Currently each of the servers runs a 642 SCSI card, and they are attached to the MSA.
It is a 4 LUN card in the MSA, so each node has it's own connection to the SAN.
I hope that helps.
TIA
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тАО06-26-2007 06:04 PM
тАО06-26-2007 06:04 PM
Re: MSA 500 G2 with 4 nodes
first things first: you have an MSA500, which has nothing to do with SAN. It's a shared SCSI Box, so you can forget about SAN Switches and zoning. Multipathing is also not relevant here, as you have 4 servers with 1 SA642 in each, so it's all single path.
You say you have 2 SQL servers and 2 IIS servers - are they clustered? If not, SSP will not help much, although you should use it anyway. 2 or more standalone windows servers CANNOT access the same LUN, as it will lead to data corruption. You either need to cluster the servers (1 cluster for SQL, 1 cluster for IIS), or use a shared filesystem like Polyserve.
Regards,
Stepohen
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тАО06-27-2007 01:15 AM
тАО06-27-2007 01:15 AM
Re: MSA 500 G2 with 4 nodes
You say that all 4 nodes cannot access the same LUN without data corruption. Does that hold true even if I set up SSP and 4 partitions on the volumes? So that each node has it's own volume and can't see the others.
I know clustering will accomplish this as well, but I don't want to go that route if I am not forced to. Even setting up SSP will present it's own drawbacks to what I am trying to accomplish.
Thanks again
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тАО06-27-2007 06:52 AM
тАО06-27-2007 06:52 AM
Solutionif you create 4 logical drives on the MSA500 and use SSP so that each server sees only one logical drive each, then you are fine. Using just Windows partitioning won't work.
NTFS is not a shared file system. If you had the same volume presented to 2 servers, if one server writes data to the disk, the other one will not see these changes (unless you reboot it). And because neither server knows about the other, they both assume they have exclusive block-level access to this disk. Both servers could end up writing different data to the same blocks, thus resulting in data corruption. In a normal Windows Cluster, the cluster locks a disk so that only one node has access at any particluar time.
Regards,
Stephen
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тАО06-27-2007 08:12 AM
тАО06-27-2007 08:12 AM
Re: MSA 500 G2 with 4 nodes
Since I really would rather NOT have to separate into 4 volumes (I know I used the word partition, but I meant volume) I will most likely go to clustering.
Thanks again!