Advice on allocating SAN storage to a virtual database server on VMware Post: 303027918

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Operating Systems Linux Red Hat Advice on allocating SAN storage to a virtual database server on VMware Post 303027918 by gull04 on Friday 28th of December 2018 08:32:26 AM

12-28-2018

Registered User

Hi,

In general the same approach is probably the way to go - however if you are going to be doing significant amounts of migration work it is worth getting the planning right.

Much of the configuration is dependent on the way that the storage is configured and whether you are using Oracle ASM or not, ASM is worth having if you have significant I/O on the database but with a high performance backend the additional managemnt overhead may not be worth while.

If the storage is tiered and you think it will deal efficiently with the I/O, I'd go for the presentation of a single LUN - this makes future migrations, DR and failover really simple. The drawback would be if you have to run fsck or some other tool, it has to do the whole LUN not just a couple of small partitions or LUN's. Where you have SAN replication the single LUN approach makes life easy, you won't miss something if it's all in one place.

If performance is key, then you may want to take advantage of the tiering in a different way. There is much to consider when doing migration work like this, it is well worth while runing a proof of concept (if you can) just to check things out.

Regards

Gull04

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LEARN ABOUT CENTOS

sg_emc_trespass

SG_EMC_TRESPASS(8)						     SG3_UTILS							SG_EMC_TRESPASS(8)

NAME

       sg_emc_trespass - change ownership of SCSI LUN from another Service-Processor to this one

SYNOPSIS

       sg_emc_trespass [-d] [-hr] [-s] [-V] DEVICE

DESCRIPTION

       sg_emc_trespass	sends  an EMC-specific Trespass Command to the DEVICE with the selected options. This Mode Select changes the ownership of
       the LUN of the device from another Service-Processor to the one the command was received on.

OPTIONS

       Arguments to long options are mandatory for short options as well.

       -d     outputs some extra debug information associated with executing this command

       -hr    Sets the 'Honor Reservation' bit in the command. If set, the trespass will only succeed to change the ownership from the Peer SP	if
	      the Peer SP does not have an outstanding SCSI reservation for the LUN. By default, the reservation state will be ignored.

       -s     Send the short version of the trespass command instead of the long version. The short version is supported on the EMC FC5300, FC4500
	      and FC4700. The long version (default) is supported on the CLARiiON CX and AX family arrays.

       -V     print out version string then exit.

       In the 2.4 series of Linux kernels the DEVICE must be a SCSI generic (sg) device. In the 2.6 series block devices (e.g. SCSI disks and  DVD
       drives) can also be specified. For example "sg_start 0 /dev/sda" will work in the 2.6 series kernels.

EXIT STATUS

       The exit status of sg_emc_trespass is 0 when it is successful. Otherwise see the sg3_utils(8) man page.

AUTHOR

       Written by Lars Marowsky-Bree, based on sg_start.

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright (C) 2004-2012 Lars Marowsky-Bree, Douglas Gilbert.
       This  software  is distributed under the GPL version 2. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-
       POSE.

sg3_utils-1.35							   December 2012						SG_EMC_TRESPASS(8)