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Operating Systems Linux Red Hat Advice on allocating SAN storage to a virtual database server on VMware Post 303027928 by gull04 on Friday 28th of December 2018 09:26:22 AM
Old 12-28-2018
Hi dkmartin,

In essence that is correct, but there are a number of caveats - as I said earlier if you have tiered storage and depending on how it is configured things change.

If we take an example of a single LUN it is likely to be sliced up along the lines of what you expect usage to be with with a single slice assigned to each VG, you have to bear in mind that this single LUN may be accross many spindles at the back end - this is invisible to the system.

As an example in our VNX which has three tiers of disk at the end of the 8*16Gb agregated fibres (4 on fabric A and 4 on Fabric B) the breakdown of the system build is 30Tb of SSD for tier 1, 90Tb of 15K RPM SAS for tier 2 and 120Tb of SATA for tier 3. This has been carved into disk groups which are then sub-divided into LUN's, however the ratio of disk 1:3:4 assigned to each LUN and the intelligence of the VNX means that the parts of the system experiencing sgnificant I/O are moved dynamically to the tier 1 disk allocated to that particular LUN.

Each of the disk groups mentioned above comprises a number of physical disks, strangely enough in the 1:3:4 ratio for SSD, SAS and SATA generally twenty something disks given the sizes of the disks in the VNX.

So following the logic of your 1Tb Lun you would have available 125Gb of SSD that you do not have to manage, the system does it for you. It may well be that the storage technology you have is much older and that it does not thave this functionallity, in that case you'll have to provide a bit more information about the setup.

Regards

Gull04
 

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vxsplitlines(1M)														  vxsplitlines(1M)

NAME
vxsplitlines - show disks with conflicting configuration copies in a cluster SYNOPSIS
vxsplitlines [-g diskgroup] [-c daname] DESCRIPTION
If you import portions of a disk group on different systems, this can lead to conflicting configuration copies on the disks of the disk group. If the configuration information in a disk group is ambiguous, it may not be possible for Veritas Volume Manager to determine which config- uration copy is most up-to-date. (This is usually termed a serial split brain (SSB) condition when it occurs in a cluster.) You cannot import a disk group in this state unless you specify which disk's configuration copy to use. You can use the vxsplitlines command to see which disks in a disk group have conflicting configuration copies, and use this information together with your knowledge of the history of the disk groups' usage to determine which configuration copy is most valid. The output from vxsplitlines displays the vxdg commands that you can run to import the disk group using the available configuration copies. The -o selectcp option of the vxdg import command is used to select the configuration copy to use for the import. OPTIONS
-c daname Display the SSB IDs for each disk that are stored in the configuration copy on the disk specified by its disk access name. Note: Although the SSB IDs for some disks may match, this does not necessarily mean that those disks' configuration copies have recorded all the configuration changes. When viewed from some other configuration copies, the SSB IDs of the same disks may not match. -g diskgroup Specifies the disk group. If a disk group is not specified, the default disk group is used as determined from the rules on the vxdg(1M) manual page. EXAMPLES
Display the disks on each side of the split in the disk group newdg: vxsplitlines -g newdg Display the SSB IDs stored in the configuration copy on disk c2t4d0: vxsplitlines -g newdg -c c2t4d0 NOTES
The vxsplitlines is primarily intended to be used with private disk groups, but it also works with shared disk groups. The version number of the disk group must be 110 or greater. SEE ALSO
vxdg(1M) Veritas Volume Manager Administrator's Guide VxVM 5.0.31.1 24 Mar 2008 vxsplitlines(1M)
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