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Full Discussion: Raw volumes
Special Forums Hardware Filesystems, Disks and Memory Raw volumes Post 302361380 by kekanap on Tuesday 13th of October 2009 05:07:44 AM
Old 10-13-2009
Tools 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 ?
 

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LEARN ABOUT NETBSD

mfi

MFI(4)							   BSD Kernel Interfaces Manual 						    MFI(4)

NAME

     mfi -- LSI Logic & Dell MegaRAID SAS RAID controller

SYNOPSIS

     mfi* at pci? dev ? function ?

DESCRIPTION

     The mfi driver provides support for the MegaRAID SAS family of RAID controllers, including:

	   -   Dell PERC 5/e, PERC 5/i, PERC 6/e, PERC 6/i
	   -   Intel RAID Controller SRCSAS18E, SRCSAS144E
	   -   LSI Logic MegaRAID SAS 8208ELP, MegaRAID SAS 8208XLP, MegaRAID SAS 8300XLP, MegaRAID SAS 8308ELP, MegaRAID SAS 8344ELP, MegaRAID
	       SAS 8408E, MegaRAID SAS 8480E, MegaRAID SAS 8708ELP, MegaRAID SAS 8888ELP, MegaRAID SAS 8880EM2, MegaRAID SAS 9260-8i
	   -   IBM ServeRAID M1015, ServeRAID M5014

     These controllers support RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 50 and RAID 60 using either SAS or SATA II drives.

     Although the controllers are actual RAID controllers, the driver makes them look just like SCSI controllers.  All RAID configuration is done
     through the controllers' BIOSes.

     mfi supports monitoring of the logical disks in the controller through the bioctl(8) and envstat(8) commands.

EVENTS

     The mfi driver is able to send events to powerd(8) if a logical drive in the controller is not online.  The state-changed event will be sent
     to the /etc/powerd/scripts/sensor_drive script when such condition happens.

SEE ALSO

     intro(4), pci(4), scsi(4), sd(4), bioctl(8), envstat(8), powerd(8)

HISTORY

     The mfi driver first appeared in NetBSD 4.0.

BSD
								  March 22, 2012							       BSD
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