DISK and MPIO Post: 303033185

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Operating Systems AIX DISK and MPIO Post 303033185 by bakunin on Monday 1st of April 2019 07:26:21 AM

04-01-2019

Registered User

Quote:

Originally Posted by Phat

--> the disks marked with Defined mean that they are not available?

Exactly. AIX stores information about devices generally in the ODM. Since this is updated only by a run of cfgmgr (in fact that is the very purpose of this command) it might be that a device is still defined in the ODM (because once it was available but is not any more now) describes a device that is already removed (or not working for some other reason). These devices will be in state "Defined". Re-plung them in and they become "Available" automatically. Delete them from the ODM (via rmdev and they will be gone forever - only to return after being replugged and cfgmgr is run again.

Quote:

Originally Posted by Phat

We can opt to select the mpio method sddpcm, AIX PCM for whatever disk we want?

You need to use a driver that works (duh! ;-)) ). It does not only depend on a disk if a driver works or not but also on the nature of the connection LUN<->host system, the storage subsystem involved the type of fabric you use and so on.

I hope this helps.

bakunin

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LEARN ABOUT OSF1

sys_attrs_isa

sys_attrs_isa(5)						File Formats Manual						  sys_attrs_isa(5)

NAME

       sys_attrs_isa - isa subsystem attributes

DESCRIPTION

       This  reference page lists and describes attributes for the ISA Bus (isa) kernel subsystem. Refer to the sys_attrs(5) reference page for an
       introduction to the topic of kernel subsystem attributes.

       For this subsytem, users should modify only the following attribute and do so only for the purpose described. Any other visible	attributes
       cannot or should not be modified.

	      Enables  (1)  or disables (0) console messages that are used by driver developers to collect information about a configuration prob-
	      lem. A developer can set this attribute by using the sysconfig or sysconfigdb utility. See sysconfig(8),	sysconfigdb(8),  and  cfg-
	      mgr(8) for more information on options for modifying attributes and reconfiguring a kernel subsystem.

	      Default value: 0

SEE ALSO

       Commands: cfgmgr(8), sysconfig(8), sysconfigdb(8)

       Files: stanza(4), cfgmgr.auth(4), sysconfigtab(4)

       Others: sys_attrs(5)

       Writing EISA and ISA Bus Device Drivers

																  sys_attrs_isa(5)