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Oracle Tips by Burleson |
Disk
Configurations
As previously stated, a TMS RAMSan, a SCSI disk
array, and an ATA disk array were utilized during tests. If this were
a full disclosure benchmark, it would be necessary to divulge the
manufacturers, prices, and other details about the various arrays.
Since this is not a full benchmark, the important characteristics of
the disk array will be provided without divulging the manufacturers
since they were good enough to lend their equipment for the tests. The
specifications for the various disk and SSD equipment used are as
follows:
-
The Texas Memory Systems solid state disk
array, a 64 Gigabyte RamSan 320 was presented as one large disk. The
RamSan has no stripes, mirrors or other physical specifications
other than those created by the volume creation commands presented
before. The RamSan has built-in backup capabilities in case of loss
of power and is built using state-of-the-art high-speed ECC memory
chips.
-
The SCSI array used in initial testing
consisted of 2-36 Gigabyte 10,000 RPM Seagate Cheetah disks striped
at 128K.
-
The ATA array used in final testing consisted
of 7-200 Gigabyte 7,200 RPM 133 disks. The disks were striped n 64K
stripes.
-
The disk HBA interface cards were QlogicQLA2342
2-Gigabit fibre channel.
The output of the
dmesg command show the actual
system disk configurations for the first part of the test using the
SCSI drives.
scsi(1): Topology - (N_Port-to-N_Port), Host
Loop address 0x1
Vendor: TMS Model:
FC65 Rev: 1.4b
Type:
Direct-Access ANSI SCSI revision: 04
Starting timer : 0 0
blk: queue f6e24e18, I/O limit 4095Mb (mask
0xffffffff)
scsi(0:0:0:0): Enabled tagged queuing, queue
depth 32.
Starting timer : 0 0
Vendor: (omitted by request) Model:
(omitted) FC RAID Rev: 3.03
Type: Direct-Access
ANSI SCSI revision: 03
Starting timer : 0 0
blk: queue f6e24c18, I/O limit 4095Mb (mask
0xffffffff)
scsi(1:0:0:0): Enabled tagged queuing, queue
depth 32.
Attached scsi disk sda at scsi0, channel 0, id
0, lun 0
Attached scsi disk sdb at scsi1, channel 0, id
0, lun 0
SCSI device sda: 134217728 512-byte hdwr
sectors (68719 MB)
sda: unknown partition table
SCSI device sdb: 143360000 512-byte hdwr
sectors (73400 MB)
sdb: unknown partition table
Other than showing a different device, the listing
for the ATA based disk array was identical to the listing for
sdbabove.
Other than the RAMSan array, these are standard
off-the-shelf components configured as they would be for use in Oracle
shops worldwide. The next topic is the network configuration.
The above book excerpt is from:
Oracle
Solid State Disk Tuning
High Performance Oracle
tuning with RAM disk
ISBN
0-9744486-5-6
Donald K. Burleson & Mike Ault
http://www.rampant-books.com/book_2005_1_ssd.htm
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