Hi,
based on the recommondations I bought a OCZ Vertex 4 with 128 GB for my system. So far so good, installation went smooth with Desperado and the system is running well. Everything nice and the owner was happy until Devil ;-) asked me to do some checks to compare his Vertex 3 with the Vertex 4
hdparm -Tt --direct /dev/sdX = Result
His Vertex 3 delivers ~ 480 MB/s
I'm stuck with the following
Timing O_Direct cached reads : 498 MB in 2 sec = 248.51 MB/sec
Timing O_Direct disk reads : 1044 MB in 3 sec =347.92 MB/sec
The board is a Asus P8z68 V-Pro , the SSD is connected to one SATA6 port
When setting up the disk I followed the remarks on the wiki. There is only one partition on it.
Anybody with a clue what is going wrong here ?
Any further details needed ?
/dev/sda:
ATA device, with non-removable media
Model Number: OCZ-VERTEX4
Serial Number: OCZ-JW4ME492INDP21VC
Firmware Revision: 1.3
Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
Supported: 9 8 7 6
Likely used: 9
Configuration:
Logical max current
cylinders 16383 0
heads 16 0
sectors/track 63 0
--
LBA user addressable sectors: 250069680
LBA48 user addressable sectors: 250069680
Logical Sector size: 512 bytes
Physical Sector size: 512 bytes
Logical Sector-0 offset: 0 bytes
device size with M = 1024*1024: 122104 MBytes
device size with M = 1000*1000: 128035 MBytes (128 GB)
cache/buffer size = unknown
Nominal Media Rotation Rate: Solid State Device
Capabilities:
LBA, IORDY(can be disabled)
Queue depth: 32
Standby timer values: spec'd by Standard, no device specific minimum
R/W multiple sector transfer: Max = 16 Current = 16
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns
tks
Henning
Hi henning,
Motherboard: Asus P8Z68 LE, Vertex 3, SATA6 port
SATA mode in Bios set to "IDE-kompatible":
Quote/dev/sda:
Timing O_DIRECT cached reads: 498 MB in 2.00 seconds = 248.57 MB/sec
Timing O_DIRECT disk reads: 1136 MB in 3.00 seconds = 378.15 MB/sec
with SATA mode set to AHCI:
QuoteTiming O_DIRECT cached reads: 924 MB in 2.00 seconds = 461.40 MB/sec
Timing O_DIRECT disk reads: 1402 MB in 3.00 seconds = 466.88 MB/sec
hth
ayla
EDIT: Warning -an Windows XP test system won't boot here in AHCI mode, it needs IDE.
Hi,
I changed the Sata port from port 2 to port 1 , port 2 stays mty.
Cable replaced , result is the same.
Whilst googeling I found following page :https://wiki.archlinux.org/index.php/SSD_Benchmarking#OCZ-VERTEX_4_120_gb
and the results are quite different. Where they report
Quote
# hdparm -Tt /dev/sda
/dev/sda:
Timing cached reads: 16950 MB in 2.00 seconds = 8486.21 MB/sec
Timing buffered disk reads: 722 MB in 3.01 seconds = 240.09 MB/sec
Unquote
With my setup I achieve ~ 12000-13000 MB/sec for the first and about 270 MB/sec for the second read.
So, what is the actual difference in testing with the "--direct" option ?
And yes I noted that they tested the performance with max speeds of 5.0 GB/s due to the PCI card. But still.
Tks for some enlightenmend :idea:
Henning
Did you enable AHCI in the BIOS?
from hdparm manpage:
--direct
Use the kernel´s "O_DIRECT" flag when performing a -t timing test. This bypasses the page cache, causing the reads to go directly from the drive into hdparm's buffers, using so-called "raw" I/O. In many cases, this can produce results that appear much faster than the usual page cache method, giving a better indication of raw device and driver performance.
greetz
devil
Moin,
yes, AHCI is enabled in the Bios. Really strange.
Maybe I switch it off and see what happens ;-)
Tks
Henning
Moin,
small update : checked on the OCZ Forum and have been advised as follows :
Quote
The results aren't unusual for FW 1.3. Firmware 1.4 changed the max speeds of the 128GB Vertex 4 significantly. Additionally, the specified speeds are based on ATTO results. You really should update to the current release for optimum performance.
Unquote
Means : firmware upgrade and reinstallation :-(
Tks
Henning
Are you shure you have to reinstall ? I don't think so.
It depends, some firmware upgrades for OCZ drives are destructive upgrades. The one for the Vertex 4 is such an upgrade. I wrote something on it in german:
http://www.pc-magazin.de/news/ocz-beschleunigt-vertex-4-mit-neuer-firmware-1278937,6510.html
greetz
devil
Flashing hard drive/SSD firmware is risky business so it is always good to back up everything before doing this
Hi,
I updated in the meantime the SSD to Firmware 1.4.1. it was destructive, but since the system was kind of fresh no big deal.
The results are as follows
Quote
hdparm -Tt --direct /dev/sda
/dev/sda:
Timing O_DIRECT cached reads: 804 MB in 2.00 seconds = 401.21 MB/sec
Timing O_DIRECT disk reads: 1294 MB in 3.00 seconds = 430.91 MB/sec
and
Quote
hdparm -Tt /dev/sda
/dev/sda:
Timing cached reads: 26552 MB in 2.00 seconds = 13294.27 MB/sec
Timing buffered disk reads: 1196 MB in 3.00 seconds = 398.66 MB/sec
That looks much better :D
Tks
Henning