| sycamorex |
07-30-2011 09:44 AM |
a new ssd questions.
I decided to start a new thread as my other one (SSD - is it worth it?) was more concerned with questions before buying an ssd drive.
Ok, I have installed the new drive. Here are the steps I've done:
I followed these steps for aligning the drive to 512KB (I had copied it to a text file from an OCZ forum - can't find the link now).
Code:
fdisk -H 32 -S 32 /dev/sda
The number of cylinders for this disk is set to 15711.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): o
Building a new DOS disklabel with disk identifier 0x8cb3d286.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
The number of cylinders for this disk is set to 15711.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-15711, default 1): 2
Last cylinder, +cylinders or +size{K,M,G} (2-15711, default 15711):
Using default value 15711
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 83
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
When I did it for some reason the first cylinder wasn't the 1st one:
Code:
First sector 2048-117231407, default 2048:
Why wouldn't it start from the beginning? Before I did anything I checked the drive with fdisk -l and there were no existing partitions whatsoever.
Then I did:
Code:
mke2fs -b 4096 -E stride=128,stripe-width=128 -t ext4 /dev/sda1
and modified the fstab entry:
Code:
/dev/sda1 / ext4 noatime,nodiratime,discard,data=ordered,errors=remount-ro 0 1
tmpfs /tmp tmpfs nodev,nosuid,mode=1777 0 0
The drive is now:
Code:
# fdisk -l /dev/sda
Disk /dev/sda: 60.0 GB, 60022480896 bytes
26 heads, 16 sectors/track, 281806 cylinders, total 117231408 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x252830d9
Device Boot Start End Blocks Id System
/dev/sda1 2049 117231407 58614679+ 83 Linux
Code:
bash-4.1# hdparm -I /dev/sda
/dev/sda:
ATA device, with non-removable media
Model Number: OCZ-VERTEX3
Serial Number: OCZ-433AWDF9K696700F
Firmware Revision: 2.08
Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
Used: unknown (minor revision code 0x0110)
Supported: 9 8 7 6 5
Likely used: 9
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 117231408
LBA48 user addressable sectors: 117231408
Logical Sector size: 512 bytes
Physical Sector size: 512 bytes
Logical Sector-0 offset: 0 bytes
device size with M = 1024*1024: 57241 MBytes
device size with M = 1000*1000: 60022 MBytes (60 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
Advanced power management level: 254
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
Commands/features:
Enabled Supported:
* SMART feature set
Security Mode feature set
* Power Management feature set
* Write cache
Look-ahead
* Host Protected Area feature set
* WRITE_BUFFER command
* READ_BUFFER command
* NOP cmd
* DOWNLOAD_MICROCODE
* Advanced Power Management feature set
Power-Up In Standby feature set
* SET_FEATURES required to spinup after power up
* 48-bit Address feature set
* Mandatory FLUSH_CACHE
* FLUSH_CACHE_EXT
* SMART error logging
* SMART self-test
* General Purpose Logging feature set
* WRITE_{DMA|MULTIPLE}_FUA_EXT
* 64-bit World wide name
* IDLE_IMMEDIATE with UNLOAD
Write-Read-Verify feature set
* WRITE_UNCORRECTABLE_EXT command
* {READ,WRITE}_DMA_EXT_GPL commands
* Segmented DOWNLOAD_MICROCODE
* Gen1 signaling speed (1.5Gb/s)
* Gen2 signaling speed (3.0Gb/s)
* Gen3 signaling speed (6.0Gb/s)
* Native Command Queueing (NCQ)
* Host-initiated interface power management
* Phy event counters
* unknown 76[14]
* unknown 76[15]
* DMA Setup Auto-Activate optimization
Device-initiated interface power management
* Software settings preservation
* SMART Command Transport (SCT) feature set
* SCT Data Tables (AC5)
* DOWNLOAD MICROCODE DMA command
* SET MAX SETPASSWORD/UNLOCK DMA commands
* WRITE BUFFER DMA command
* READ BUFFER DMA command
* Data Set Management TRIM supported (limit 1 block)
* Deterministic read data after TRIM
Security:
Master password revision code = 65534
supported
not enabled
not locked
not frozen
not expired: security count
not supported: enhanced erase
2min for SECURITY ERASE UNIT.
Logical Unit WWN Device Identifier: 5e83a97f90e09222
NAA : 5
IEEE OUI : e83a97
Unique ID : f90e09222
Checksum: correct
In Bios, AHCI is enabled, but the drive doesn't reach it's advertised speed (sda is an ssd drive, sdb is my old sata)
Code:
bash-4.1# fdisk -l /dev/sda
Disk /dev/sda: 60.0 GB, 60022480896 bytes
26 heads, 16 sectors/track, 281806 cylinders, total 117231408 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x252830d9
Device Boot Start End Blocks Id System
/dev/sda1 2049 117231407 58614679+ 83 Linux
bash-4.1# hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 16698 MB in 2.00 seconds = 8357.87 MB/sec
Timing buffered disk reads: 964 MB in 3.00 seconds = 321.07 MB/sec
bash-4.1# hdparm -tT /dev/sdb
/dev/sdb:
Timing cached reads: 16260 MB in 2.00 seconds = 8138.36 MB/sec
Timing buffered disk reads: 182 MB in 3.01 seconds = 60.51 MB/sec
lspci -v (the bit describing the marvell controller)
Code:
01:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9128 PCIe SATA 6 Gb/s RAID controller (rev 11) (prog-if 01 [AHCI 1.0])
Subsystem: Giga-byte Technology Device b000
Flags: bus master, fast devsel, latency 0, IRQ 41
I/O ports at 9f00 [size=8]
I/O ports at 9e00 [size=4]
I/O ports at 9d00 [size=8]
I/O ports at 9c00 [size=4]
I/O ports at 9b00 [size=16]
Memory at fb9ff000 (32-bit, non-prefetchable) [size=2K]
[virtual] Expansion ROM at dff00000 [disabled] [size=64K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [70] Express Legacy Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Kernel driver in use: ahci
Does anyone know what might be an issue? I mean the advertised speed was supposed to be higher. I mean I can see a big difference in boot time and first time starting of applications, but I'd like to know how to make the speed closer to the advertised speeds (Read 550MB/s Write 495MB/s)?
Thank you. |
