Turn on suggestions
![]() Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
Reply
Topic Options
Poor performance of ExtremePro 240GBOptions
05-25-2016 04:36 PM Hi there, I recently purchased an ExtremePro 240Gb. The computer it's going in is an ASUS P5B deluxe. The drive is plugged into a 6Gb/s SATA card (a Rocket 620A Dual Port PCI-Express adapter). This adapter is plugged into a PCI-ex4 slot. The BIOS is using AHCI mode for SATA disks. I run Gentoo linux.
I have formatted the SSD into two Ext4 partitions (one 64Mb and the other is the remaining). Hdparm reveals this:
hdparm -tT /dev/sde /dev/sde: Timing cached reads: 7312 MB in 2.00 seconds = 3659.09 MB/sec Timing buffered disk reads: 576 MB in 3.00 seconds = 191.84 MB/sec Smartctl reveals this: smartctl -a /dev/sde smartctl 6.4 2015-06-04 r4109 [x86_64-linux-4.4.6-gentoo] (local build) Copyright (C) 2002-15, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Model Family: Marvell based SanDisk SSDs Device Model: SanDisk SDSSDXPS240G Serial Number: 154242402021 LU WWN Device Id: 5 001b44 ef52542e5 Firmware Version: X21200RL User Capacity: 240,057,409,536 bytes [240 GB] Sector Size: 512 bytes logical/physical Rotation Rate: Solid State Device Form Factor: 2.5 inches Device is: In smartctl database [for details use: -P show] ATA Version is: ACS-2 T13/2015-D revision 3 SATA Version is: SATA 3.2, 6.0 Gb/s (current: 6.0 Gb/s) Local Time is: Thu May 26 11:32:34 2016 NZST SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x00) Offline data collection activity was never started. Auto Offline Data Collection: Disabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: ( 0) seconds. Offline data collection capabilities: (0x11) SMART execute Offline immediate. No Auto Offline data collection support. Suspend Offline collection upon new command. No Offline surface scan supported. Self-test supported. No Conveyance Self-test supported. No Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 2) minutes. Extended self-test routine recommended polling time: ( 10) minutes. SMART Attributes Data Structure revision number: 4 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 5 Reallocated_Sector_Ct 0x0032 100 100 --- Old_age Always - 0 9 Power_On_Hours 0x0032 002 100 --- Old_age Always - 2 12 Power_Cycle_Count 0x0032 100 100 --- Old_age Always - 2 166 Min_W/E_Cycle 0x0032 100 100 --- Old_age Always - 0 167 Min_Bad_Block/Die 0x0032 100 100 --- Old_age Always - 24 168 Maximum_Erase_Cycle 0x0032 100 100 --- Old_age Always - 1 169 Total_Bad_Block 0x0032 100 100 --- Old_age Always - 398 171 Program_Fail_Count 0x0032 100 100 --- Old_age Always - 0 172 Erase_Fail_Count 0x0032 100 100 --- Old_age Always - 0 173 Avg_Write/Erase_Count 0x0032 100 100 --- Old_age Always - 0 174 Unexpect_Power_Loss_Ct 0x0032 100 100 --- Old_age Always - 0 184 End-to-End_Error 0x0032 100 100 --- Old_age Always - 0 187 Reported_Uncorrect 0x0032 100 100 --- Old_age Always - 0 188 Command_Timeout 0x0032 100 100 --- Old_age Always - 0 194 Temperature_Celsius 0x0022 064 038 --- Old_age Always - 36 (Min/Max 25/38) 199 SATA_CRC_Error 0x0032 100 100 --- Old_age Always - 0 212 SATA_PHY_Error 0x0032 100 100 --- Old_age Always - 0 230 Perc_Write/Erase_Count 0x0032 100 100 --- Old_age Always - 0 232 Perc_Avail_Resrvd_Space 0x0033 100 100 004 Pre-fail Always - 100 233 Total_NAND_Writes_GiB 0x0032 100 100 --- Old_age Always - 12 241 Total_Writes_GiB 0x0030 253 253 --- Old_age Offline - 11 242 Total_Reads_GiB 0x0030 253 253 --- Old_age Offline - 3 244 Thermal_Throttle 0x0032 000 100 --- Old_age Always - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 No self-tests have been logged. [To run self-tests, use: smartctl -t] Selective Self-tests/Logging not supported That shows that TRIM is enabled and that it's in 6Gb/s mode.
Question: what is causing this new SSD to perform so slowly? What can I look at to diagnose this issue? Re: Poor performance of ExtremePro 240GBOptions
05-26-2016 08:57 AM Hi allistar,
Yes the speed seems slow, there may be various reasons to it, maybe the PCIe adaptor, the driver or even the drive its self etc.
We have never tested a PCIe adapter for this drive, if you want, I can forward this information to our development and have them take a look, but please send the full system info too.
Please note, due to bandwidth reasons, there is no ETA on when will they get back on this. Re: Poor performance of ExtremePro 240GBOptions
05-26-2016 04:59 PM The reason I'm using a PCIe adapter for SATA is that it's 6Gb/s while the build in SATA on the motherboard is only 3Gb/s. I will try the SSD on the motherboard SATA headers to see if it makes a difference, but I can't see it being any faster.
The relevant specs for this computer are: Processor: Intel QX6700 (quad core 2.6GHz) PCIe card: Highpoint Rocket 620A plugged into a PCIe-x4 port, though it's only a x1 card.
I have not installed any specific drivers for this drive or the controller. It just works. I am using an Ext4 filesystem on the SSD, though that shouldn't be relevant to the speed test as that's done on the drive itself, not the partition.
What else do you need to know? Re: Poor performance of ExtremePro 240GBOptions
05-27-2016 02:21 PM There are variety of reasons of a performance drop, is your PCIe port NVMe or SATA ? If you connect a SATA device to PCIe port with an adaptor, there's no gurantee of the performance you will be getting, because the product is not designed to work that way, and I have no idea what the adaptor does during transfering signal, so my suggestion would be find a SATAIII port and re-test about speed.
I understand the drive works under your current driver, but drivers may cause the drive is not up to full speed too, that's the reason I want you to update the drivers Re: Poor performance of ExtremePro 240GBOptions
05-27-2016 06:27 PM The motherboard is quite old so doesn't have NVMe support. The M/B doesn't have any SATA3 headers, they are all SATA2 (this is the reason for the PCIe SATA3 adapter). The SATA adapter has native support in Linux, no additional drivers are necessary. I know this from here:
I will plug the SSD into the mptherboard SATA2 ports.
Is there an SATA3 expansion card that you can rtecommend for use with SanDisk SSDs for optimum performance? Re: Poor performance of ExtremePro 240GB[ Edited ]Options
05-31-2016 10:01 AM - edited 05-31-2016 10:02 AM
allistar: I'm also Linux user and interested how you can see from that list that TRIM is enabled? Is it something that's enabled by default or you need to adjust drive parameters?
Re: Poor performance of ExtremePro 240GBOptions
05-31-2016 03:05 PM To get TRIM working I did this - make sure the BIOS is using AHCI and not IDE for the disks. You can tell it is by: dmesg | grep AHCI
- use the Ext4 file system. This supports TRIM.
To see if trim is supported on the drive do this:
hdparm -I /dev/sde
(where /dev/sde is the drive).
That should say "Data Set Management TRIM supported" somewhere.
- make sure you add "discard" to the options for the mount points in /etc/fstab
Highlighted
Re: Poor performance of ExtremePro 240GB[ Edited ]Options
05-31-2016 03:53 PM - edited 05-31-2016 04:14 PM Yep, I see it, thanks. I'm using XFS, it also supports TRIM.
About discard - after some extensive reading which I did today after getting my Extreme Pro 480GB, I figured out it's actually not a good idea, because Linux kernel doesn't implement it efficiently (and it was never fixed as far as I know).
The kernel implementation of realtime trim in 11.2, 11.3, and 11.4 is not optimized. The spec. calls for trim supporting a vectorized list of trim ranges, but as of kernel 3.0 trim is only invoked by the kernel with a single discard / trim range and with current mid 2011 SSDs this has proven to cause a performance degradation instead of a performance increase. There are few reasons to use the kernels realtime discard support with pre-3.1 kernels. It is not known when the kernels discard functionality will be optimized to work beneficially with current generation SSDs.
So recommended way is to use periodic TRIM with fstrim. At least on Debian I did this:
sudo cp /usr/share/doc/util-linux/examples/fstrim.{service,timer} /etc/systemd/system sudo systemctl enable fstrim.timer sudo systemctl start fstrim.timer It creates a systemd weekly timer which will call fstrim -a which does TRIM on each supported partition. Re: Poor performance of ExtremePro 240GBOptions
05-31-2016 04:39 PM Thanks, that's interesting. The article was last modified in June 2013, I wonder how relevent it is today. Re: Poor performance of ExtremePro 240GBOptions
05-31-2016 06:37 PM I'll do some more research on this and will post here if I'll find anything. |