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AIX 5.3 MPIO vs RDAC on DS4000 range

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Operating Systems AIX AIX 5.3 MPIO vs RDAC on DS4000 range
# 8  
Old 10-09-2008
Quote:
Originally Posted by shockneck
Interesting setup but still no load-balancing. Do you use other san storage beside the DS4K or what else is the reason for using SVC?
i'm not sure what you mean by load balancing, but with the svc, both HBA are active and provide a total of 4 paths to the disks. where as without the svc and using a ds4000, one hba is active and the other is passive.

i've read that mpio is possible with just a ds4000 but is not officially supported.

kimyo,

the vios is going through the svc to serve out the disks.
# 9  
Old 10-09-2008
Quote:
Originally Posted by dig1tal
i[...] with the svc, both HBA are active and provide a total of 4 paths to the disks. where as without the svc and using a ds4000, one hba is active and the other is passive. [...]
As you must use RDAC from DS4K into SVC there is no lb from DS4K to SVC. If you want true lb all the way from storage box to server you cannot use DS4K.
You said you use SVC for reasons of performance hence I rule out that you need SVC to combine different types of SAN storage. Thus the only reason I can think of why such a solution would be faster than connecting to a FC switch directly was that the server's HBA are 2GBit while at the SVC and DS4K side they are 4GBit. This way the SVC could speed up throughput by using lb policy from SVC to server.

@kimyo, From redbook sg24-7940:
Quote:
SDDPCM and third-party multipathing software For Virtual I/O Servers attached to IBM SAN storage (such as SVC, DS8000, DS6000, and ESS), Subsystem Device Driver Path Control Module (SDDPCM) multipathing software is installed on the Virtual I/O Servers to provide the load balancing and redundancy across multiple fibre channel connections between the Virtual I/O Servers and the IBM SAN Storage. Download the SDDPCM software from the following IBM Storage Web site: IBM - Subsystem Device Driver Path Control Module (SDDPCM) In addition to IBM SAN storage, the Virtual I/O Server also supports many third-party SAN storage solutions and allows the installation of third-party, vendor-specific multipathing software.
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