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Full Discussion: Aix and Storage Hitachi
Operating Systems AIX Aix and Storage Hitachi Post 302395648 by kah00na on Tuesday 16th of February 2010 02:35:02 PM
Old 02-16-2010
I've used Hitachi USP and 9980 DASD with our AIX 6.1 boxes. It was in a Raid 5 configuration so we didn't do any mirroring on our side. It worked well and was very fast. If you are using on a server with physical fiber cards assigned to it, like a VIO server, you need to install the HTC_MPIO_ODM_5400I and HTC_MPIO_ODM_5401U filesets so that AIX correctly recognizes the disks. Without those, the "lscfg" AIX command will call them something like "FCSCI Other". With it, the output looks like this:

Code:
vio1:/:# lscfg -vl hdisk5 | grep hdisk5
  hdisk5           U7311.D20.10B518A-P1-C06-T1-W50060E80042B3556-L5000000000000  Hitachi MPIO Disk USP (Fibre)
vio1:/:#

Before you add too many disks, you will want to set these fiber card attributes:
Code:
chdev -l fscsi0 -a dyntrk=yes -a fc_err_recov=fast_fail -P

With every LUN (hdisk) we were assigned, we set the following disk attributes on our VIO servers:

Code:
chdev -l hdisk5 -a reserve_policy=no_reserve -a algorithm=round_robin -a pv=yes -a hcheck_interval=3600 -a queue_depth=4 -P

Since, the disk changes cannot be made "on-the-fly", I set the attributes with the "-P" and then did "rmdev -l hdisk5" followed by "mkdev -l hdisk5". This took the disk out of the system configuration and then brought it back in with the attributes set appropriately.

We always had good luck with Hitachi USP and 9980 disks.
 

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DBIx::Class::Storage::DBI::Replicated::Replicant(3)	User Contributed Perl Documentation    DBIx::Class::Storage::DBI::Replicated::Replicant(3)

NAME
DBIx::Class::Storage::DBI::Replicated::Replicant - A replicated DBI Storage Role SYNOPSIS
This class is used internally by DBIx::Class::Storage::DBI::Replicated. DESCRIPTION
Replicants are DBI Storages that follow a master DBI Storage. Typically this is accomplished via an external replication system. Please see the documents for DBIx::Class::Storage::DBI::Replicated for more details. This class exists to define methods of a DBI Storage that only make sense when it's a classic 'slave' in a pool of slave databases which replicate from a given master database. ATTRIBUTES
This class defines the following attributes. active This is a boolean which allows you to programmatically activate or deactivate a replicant from the pool. This way you can do stuff like disallow a replicant when it gets too far behind the master, if it stops replicating, etc. This attribute DOES NOT reflect a replicant's internal status, i.e. if it is properly replicating from a master and has not fallen too many seconds behind a reliability threshold. For that, use "is_replicating" and "lag_behind_master". Since the implementation of those functions database specific (and not all DBIC supported DBs support replication) you should refer your database-specific storage driver for more information. master Reference to the master Storage. METHODS
This class defines the following methods. debugobj Override the debugobj method to redirect this method call back to the master. ALSO SEE
<http://en.wikipedia.org/wiki/Replicant>, DBIx::Class::Storage::DBI::Replicated AUTHOR
John Napiorkowski <john.napiorkowski@takkle.com> LICENSE
You may distribute this code under the same terms as Perl itself. perl v5.18.2 2013-07-12 DBIx::Class::Storage::DBI::Replicated::Replicant(3)
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