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SSD drivers and SRDF setup
Here is one interesting scenario.SRDF setup with R1 and R2,ClonesC1,C2 on each side.Planning to use the host on C2-side to access the data on a dial basis to perform backups or to do some tests.
Since the LUN ID are more than 255 allocated on the FAs,Solaris host want to install the ssd drivers. Initial plan was to use sd.conf file to control which devices can be accessed by the servers(Either clones or Primary volumes).In this case since ssd driver discovers the storage dynamically,how would i be able to control,which device need to be accessed?Is there any static method?
Reason for doing that way is,If i mask primary and Clone volumes to FA then ssd will discover both but while importing the volume groups to solaris,it would get confused to which disks to use since both of them will have same Private regions.
Any thoughts/ ideas will be appreciated..
Since the LUN ID are more than 255 allocated on the FAs,Solaris host want to install the ssd drivers. Initial plan was to use sd.conf file to control which devices can be accessed by the servers(Either clones or Primary volumes).In this case since ssd driver discovers the storage dynamically,how would i be able to control,which device need to be accessed?Is there any static method?
Reason for doing that way is,If i mask primary and Clone volumes to FA then ssd will discover both but while importing the volume groups to solaris,it would get confused to which disks to use since both of them will have same Private regions.
Any thoughts/ ideas will be appreciated..
606
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Posted January 21st, 2009 14:00
Other than masking and unmasking,Is there file like sd.conf to modify on the host side for ssdf configuration.Everyday Clone volumes on the R2 side needs to be accessed.606
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Posted January 22nd, 2009 00:00
SSD driver can't be "tweeked" via sd.conf file .. thus if you have more then 255 devices, you have to either
1) map on more ports .. (map half of the devices on a couple of FA ports and another half on another pair of FA ports. If possible bring FA ports online/offline to filter devices. Otherwise change masking (!!!!) to filter devices.
2) map all devices on a single pair of port and use lun offsett to filter devices
3) map all devices on a single pair of ports and use masking to filter devices
I don't see too many options here ... :-/606
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Posted January 22nd, 2009 06:00
Thanks for moving the thread here.Not familar with Lunoffset ..Can you point me to some where?This is a solaris environment.
This is another option i am thinking...May be using veritas exclude file to list the disk that needs to be excluded on the host.606
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Posted January 22nd, 2009 07:00
Srichev this thread was already here .. I simply locked the other one (in Symmetrix area) and put a line advertising this one
The thread may stay here or move itself in Symmetrix area depending on your taste .. Tell me what you prefer and I'll move the thread if needed.
Use Veritas Exclude file ?? Never used it .. I work for EMC and tend to talk about EMC stuff
I'll try to find a thread dealing with lun offsett .. check back soon !!606
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Posted January 22nd, 2009 08:00
Leave the thread here.
Not sure on yout second point. 2) map all devices on a single pair of port and use lun offsett to filter devices.
BY Lun off set,Can i tell scan only 1-10 LUNs or 11-20.So that it will scan only those?606
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Posted January 22nd, 2009 09:00
Lun offsett is a feature offered by our storages .. Solaris can "see" only luns with lun id from 000 to 0ff (255 luns). But you can map more then 1000 devices on a FA port.
Have a look at the following thread:
https://forums.emc.com/forums/thread.jspa?messageID=500258
Enjoy!606
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Posted January 22nd, 2009 10:00
Thanks..I will be setting up test environment to filter devices.
Message was edited by:
srichev
Allen Ward
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2124 Posts
606
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Posted January 21st, 2009 13:00
We normally leave our R2s masked for DR activation. If we run a DR test we switch to masking the Clones. Once the test is completed we revert back to the R2s mapped. It's a bit of a pain to set up, but once it is it just needs to be maintained.