Disk alignment inside of an LDOM Post: 303033319

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Operating Systems Solaris Disk alignment inside of an LDOM Post 303033319 by rtmg on Wednesday 3rd of April 2019 07:32:54 AM

04-03-2019

Registered User

Disk alignment inside of an LDOM

Hi! Quick background for the question...

I have Solaris 11.4 control/primary zone with some LDOM's on top of it. I have some raw iSCSI LUN's presented to the control zone/primary zone from a NetApp, which I then pass up to the LDOM's via the VDS/vdisk. So basically the LDOM VM's see the disk as a local disk. (VM's are all Solaris 11.4). Disks are presented from the NetApp as the "Solaris" OS type (current Oracle docs say to NOT use "Solaris EFI" OS type regardless of disk size or partition type).

There are some best practices and docs out there from both Oracle and NetApp that require you to add some configurations to the vds.conf file to make sure disks are aligned.

I am able to align (and verify they are aligned via NetApp and zdb command) any new zpool's that I make on the VM, but here is the question...

How can I align the root pool? The root pool is created when I install Solaris, so unlike creating a new zpool where it takes the block settings from the vds.conf file, the root pool wont have these settings.

As it stands now the zdb command is telling me there is an ashift of 9 (instead of 12) and the NetApp lun alignment is saying "partial-writes".

Last edited by rtmg; 04-03-2019 at 08:39 AM..

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LEARN ABOUT OPENSOLARIS

zdb

zdb(1M) 						  System Administration Commands						   zdb(1M)

NAME

       zdb - ZFS debugger

SYNOPSIS

       zdb pool

DESCRIPTION

       The  zdb command is used by support engineers to diagnose failures and gather statistics. Since the ZFS file system is always consistent on
       disk and is self-repairing, zdb should only be run under the direction by a support engineer.

       If no arguments are specified, zdb, performs basic consistency checks on  the  pool  and  associated  datasets,	and  report  any  problems
       detected.

       Any options supported by this command are internal to Sun and subject to change at any time.

EXIT STATUS

       The following exit values are returned:

       0    The pool is consistent.

       1    An error was detected.

       2    Invalid command line options were specified.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWzfsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Unstable			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       zfs(1M), zpool(1M), attributes(5)

SunOS 5.11							    31 Oct 2005 							   zdb(1M)