Archive for the ‘Fibre Channel’ Category
Tuesday, January 22nd, 2008
I/O stack components Overview
Typically the stack consists of the following
• Database
• Character or block device driver
• Multipathing driver
• SCSI driver
• HBA
• System Bus
• Switch/iSCSI routers
• Storage Array
• Disks
Example of vendors:
ASM-Database IBM Oracle
Character or block device driver
Multipathing driver – PowerPath, Windows MPIO
SCSI driver
HBA – Host Bus Adapter, Qlogic (IBM), Emulex
System Bus ...
Posted in hardware setup, oracle, ibm db2, Back-of-the-Envelope, Database, Storage, Design, Fibre Channel, Capacity planning | No Comments »
Tuesday, January 22nd, 2008
Common misunderstandings:
“If I buy 2 Gigabit HBAs I will get 2 Gigabytes of throughput, that’s more than enough throughput for my 400 MB/s application”
“I only need 2 disks to store my 1 TB database, now that we have 500GB disk drives are available!”
The first misunderstanding is not just about bits ...
Posted in Back-of-the-Envelope, Database, Storage, Design, Fibre Channel, Capacity planning | No Comments »
Tuesday, January 22nd, 2008
Saw this definition from one of the Oracle OpenWorld sessions, thought it was pretty clear and concise:
Throughput
The measure of the transfer of bits across the media over a given period of time. Commonly used in discussing data transfer rates
Due to a number of factors, throughput usually does not match the ...
Posted in Back-of-the-Envelope, Database, Storage, Design, Fibre Channel | No Comments »