09-20-2010
SAN and Disk I/O ... do we care?
Hi all,
My main function is as a DBA. Another person manages the server and the SAN.
I just want to know if I should be worried about high disk I/O or is it irrelevant as the I/O "load balancing" will be "taken care" of by the SAN?
For example, I have hdisk1-5 and I can see that there are high disk activity for hdisk1-3 but minimal on hdisk4-5, should I be concern and move database files from hdisk1-3 to hdisk4-5 and spread them around?
FYI, I can account for when hdisk1-3 are busy which is during the data load but while this is expected, I am thinking maybe it will "help the SAN" if I move out some of the database files to the filesystem where hdisk4-4 are assigned to.
Any input will be much appreciated. Thanks in advance.
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Moved to "Dummies" forum.
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fp(7d) Devices fp(7d)
NAME
fp - Sun Fibre Channel port driver
DESCRIPTION
The fp driver is a Sun fibre channel nexus driver that enables fibre channel topology discovery, device discovery, fibre channel adapter
port management and other capabilities through well-defined fibre channel adapter driver interfaces.
The fp driver requires the presence of a fabric name server in fabric and public loop topologies to discover fibre channel devices. In pri-
vate loop topologies, the driver discovers devices by performing PLOGI to all valid AL_PAs, provided that devices do not participate in
LIRP and LILP stages of loop initialization.
CONFIGURATION
The fp driver is configured by defining properties in the fp.conf file. The fp driver supports the following properties:
mpxio-disable
Solaris I/O multipathing is enabled or disabled on fibre channel devices with the mpxio-disable property. Specifying mpxio-disable="no"
activates I/O multipathing, while mpxio-disable="yes" disables the feature.
Solaris I/O multipathing may be enabled or disabled on a per port basis. Per port settings override the global setting for the specified
ports. The following example shows how to disable multipathing on port 0 whose parent is /pci@8,600000/SUNW,qlc@4:
name="fp" parent="/pci@8,600000/SUNW,qlc@4" port=0
mpxio-disable="yes";
manual_configuration_only
Automatic configuration of SCSI devices in the fabric is enabled by default and thus allows all devices discovered in the SAN zone to be
enumerated in the kernel's device tree automatically. The manual_configuration_only property may be configured to disable the default
behavior and force the manual configuration of the devices in the SAN. Specifying manual_configuration_only=1 disables the automatic con-
figuration of devices.
FILES
/kernel/drv/fp
32-bit ELF kernel driver (x86)
/kernel/drv/amd64/fp
64-bit ELF kernel driver (x86)
/kernel/drv/sparcv9/fp
64-bit ELF kernel driver (SPARC)
/kernel/drv/fp.conf
fp driver configuration file.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|mpxio-disable |Unstable |
+-----------------------------+-----------------------------+
|manual_configuration_only |Obsolete |
+-----------------------------+-----------------------------+
|Availability |SUNWfctl |
+-----------------------------+-----------------------------+
SEE ALSO
cfgadm_fp(1M), prtconf(1M), stmsboot(1M), driver.conf(4), attributes(5), fcp(7D), fctl(7D), scsi_vhci(7D)
Writing Device Drivers
Fibre Channel Physical and Signaling Interface (FC-PH) ANSI X3.230: 1994
Fibre Channel Generic Services (FC-GS-2) Project 1134-D
Fibre Channel Arbitrated Loop (FC-AL) ANSI X3.272-1996
Fibre Channel Protocol for SCSI (FCP) ANSI X3.269-1996
SCSI-3 Architecture Model (SAM) Fibre Channel Private Loop SCSI Direct Attach (FC-PLDA) ANSI X3.270-1996
SCSI Direct Attach (FC-PLDA) ANSI X3.270-1996
SCSI Direct Attach (FC-PLDA) NCITS TR-19:1998
Fabric Loop Attachment (FC-FLA), NCITS TR-20:1998
SunOS 5.10 2 Dec 2004 fp(7d)