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added what I actually needed and removed hypotheses that grew into the answer
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ikudyk
ikudyk
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Imagine I have a number of block devices, that I know are the same device but who have different identificators (it may be a device cut and clued with dmsetup, exported multiple times through iSCSI, etc.). I can guarantee the same volume of them, yet they may have different types (physical device and FC target, for instance). I want to multipath them via multipath util.

man reads, that I can force different policies, but can I force multipath maps themselves? Whatever is the method for detecting path failure, whatever is the path priority policy, it does not depend on device type or their serial/IQN, so I see no conceptual problem in here. However, I do not find anything like that in documentation.

I find multipaths section in multipath.conf file promising, but it relies on wwid heavily, which I can not find on generic SCSI device as a attribute.

Any ideas?

Imagine I have a number of block devices, that I know are the same device but who have different identificators (it may be a device cut and clued with dmsetup, exported multiple times through iSCSI, etc.). I can guarantee the same volume of them, yet they may have different types (physical device and FC target, for instance).

man reads, that I can force different policies, but can I force multipath maps themselves? Whatever is the method for detecting path failure, whatever is the path priority policy, it does not depend on device type or their serial/IQN, so I see no conceptual problem in here. However, I do not find anything like that in documentation.

I find multipaths section in multipath.conf file promising, but it relies on wwid heavily, which I can not find on generic SCSI device as a attribute.

Any ideas?

Imagine I have a number of block devices, that I know are the same device but who have different identificators (it may be a device cut and clued with dmsetup, exported multiple times through iSCSI, etc.). I can guarantee the same volume of them, yet they may have different types (physical device and FC target, for instance). I want to multipath them via multipath util.

man reads, that I can force different policies, but can I force multipath maps themselves? Whatever is the method for detecting path failure, whatever is the path priority policy, it does not depend on device type or their serial/IQN, so I see no conceptual problem in here. However, I do not find anything like that in documentation.

Any ideas?

Source Link
ikudyk
ikudyk
  • 93
  • 1
  • 1
  • 9

Can one force multipath?

Imagine I have a number of block devices, that I know are the same device but who have different identificators (it may be a device cut and clued with dmsetup, exported multiple times through iSCSI, etc.). I can guarantee the same volume of them, yet they may have different types (physical device and FC target, for instance).

man reads, that I can force different policies, but can I force multipath maps themselves? Whatever is the method for detecting path failure, whatever is the path priority policy, it does not depend on device type or their serial/IQN, so I see no conceptual problem in here. However, I do not find anything like that in documentation.

I find multipaths section in multipath.conf file promising, but it relies on wwid heavily, which I can not find on generic SCSI device as a attribute.

Any ideas?