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Full Discussion: Advice on allocating SAN storage to a virtual database server on VMware
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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LEARN ABOUT OPENSOLARIS

mega_sas

mega_sas(7D)							      Devices							      mega_sas(7D)

NAME

       mega_sas - SCSI HBA driver for LSI MegaRAID SAS controller

DESCRIPTION

       The mega_sas MegaRAID controller host bus adapter driver  is a  SCSA-compliant  nexus  driver that supports the Dell PERC 5/E, 5/i, 6/E and
       6/i RAID controllers, the IBM ServeRAID-MR10k SAS/SATA  controller and  the  LSI  MegaRAID  SAS/SATA  8308ELP,  8344ELP,  84016E,  8408ELP,
       8480ELP, 8704ELP, 8704EM2, 8708ELP, 8708EM2, 8880EM2 and 8888ELP series of controllers.

       Supported  RAID	features  include RAID levels 0, 1, 5, and 6, RAID spans 10, 50 and 60, online capacity expansion (OCE), online RAID level
       migration (RLM), auto resume after loss of  system power during arrays, array rebuild or reconstruction (RLM) and configurable stripe  size
       up  to  1MB. Additional supported RAID features include check consistency for background data integrity, patrol read for media scanning and
       repairing, 64 logical drive support, up to 64TB LUN support, automatic rebuild and global and dedicated hot spare support.

CONFIGURATION

       The mega_sas.conf file contains no user configurable parameters. Please configure your hardware through the related  BIOS  utility  or  the
       MegaCli	configuration  utility.  If  you  want to install to a drive attached to a mega_sas HBA, you should create the virtual drive first
       from the BIOS before running the Solaris install. You can obtain the MegaCli utility from the LSI website.

       The mega_sas device can support up to  64 virtual disks. Note that BIOS numbers the virtual disks as 1 through 64, however in  the  Solaris
       operating  environment virtual disks are numbered from 0 to 63.	Also note that SAS and SATA drives cannot be configured into the same vir-
       tual disk.

KNOWN PROBLEMS AND LIMITATIONS

       The mega_sas driver does not support the LSI MegaRAID SAS 8204ELP, 8204XLP, 8208ELP, and 8208XLP controllers.

FILES

       /kernel/drv/mega_sas	     32-bit ELF kernel module. (x86)

       /kernel/drv/amd64/mega_sas    64-bit kernel   module. (x86)

       /kernel/drv/mega_sas.conf     Driver configuration file (contains no user-configurable options).

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |x86-based systems 	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWmegasas		   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Uncommitted		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       prtconf(1M), attributes(5), sata(7D), scsi_hba_attach_setup(9F), scsi_sync_pkt(9F), scsi_transport(9F), scsi_inquiry(9S),  scsi_device(9S),
       scsi_pkt(9S)

       Small Computer System Interface-2 (SCSI-2)

SunOS 5.11							    14 Aug 2008 						      mega_sas(7D)
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