Raw volumes Post: 302361380

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Special Forums Hardware Filesystems, Disks and Memory Raw volumes Post 302361380 by kekanap on Tuesday 13th of October 2009 05:07:44 AM

10-13-2009

Registered User

Raw volumes

The query is as follows :
A typical server configs when using Oracle or any other type of DB is to install the OS + DB binaries on the internal disks of the relevant server e.g.
Disk 1 : OS + SW + DB binaries
Disk 2 : Mirror of disk 1 (used for resiliency)

Then one uses an external array that is typically connected via Fibre Channel Card from Server to Storage Array.
One then configures the storage array either in RAID 10 or RAID 5 (typically a trade off between READ/WRITE speed vs. STORAGE DURATION/LENGTH).

Now the question is if one had a server which has the capacity of having 6 x Internal Disks (e.g. 6 x 146 GB 15K rpm SAS) what is the trade off if:
(1) Disk 1 = OS + SW + DB binaries
(2) Disk 2 = Mirror Disk 1 (e.g. RAID 1 config)
(3) Disk 3 & 4 are then RAID 10 to Disks 5 & 6 , where Disk 3 & 4 hold the raw vols for the DB

Would it still be better to use a Fibre Channel Card to an External Storage Array to house the raw vols of the DB and why ?

kekanap

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LEARN ABOUT SUSE

vgreduce

VGREDUCE(8)						      System Manager's Manual						       VGREDUCE(8)

NAME

       vgreduce - reduce a volume group

SYNOPSIS

       vgreduce  [-a|--all] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--removemissing] [-t|--test] [-v|--verbose] VolumeGroupName [Physi-
       calVolumePath...]

DESCRIPTION

       vgreduce allows you to remove one or more unused physical volumes from a volume group.

OPTIONS

       See lvm for common options.

       -a, --all
	      Removes all empty physical volumes if none are given on command line.

       --removemissing
	      Removes all missing physical volumes from the volume group, if there are no logical volumes allocated on those. This resumes  normal
	      operation of the volume group (new logical volumes may again be created, changed and so on).

	      If this is not possible (there are logical volumes referencing the missing physical volumes) and you cannot or do not want to remove
	      them manually, you can run this option with --force to have vgreduce remove any partial LVs.

	      Any logical volumes and dependent snapshots that were partly on the missing disks get removed completely. This includes those  parts
	      that lie on disks that are still present.

	      If your logical volumes spanned several disks including the ones that are lost, you might want to try to salvage data first by acti-
	      vating your logical volumes with --partial as described in lvm (8).

SEE ALSO

       lvm(8), vgextend(8)

Sistina Software UK					 LVM TOOLS 2.02.67(2) (2010-06-04)					       VGREDUCE(8)