slow SSD vs HDD

Revers62 · 6. November 2018

Hi all

I just test speed of my disk and see SSD is slow.
sdf is a SSD
sde is a HDD

result for sdf :

Code

~# hdparm -t /dev/sdf


/dev/sdf:
 Timing buffered disk reads: 236 MB in  3.08 seconds =  76.69 MB/sec
root@nas:~# sudo hdparm -Tt /dev/sdf

result for sde :

Code

hdparm -t /dev/sde


/dev/sde:
 Timing buffered disk reads: 544 MB in  3.01 seconds = 180.73 MB/sec

I dig a little and see that : SB7x0/SB8x0/SB9x0 SATA Controller [IDE mode]

Do you kow if I can safely change IDE mode to AHCI in the bios ?

Code

sudo lshw -class storage
  *-storage
       description: SATA controller
       produit: SB7x0/SB8x0/SB9x0 SATA Controller [IDE mode]
       fabriquant: Advanced Micro Devices, Inc. [AMD/ATI]
       identifiant matériel: 11
       information bus: pci@0000:00:11.0
       version: 00
       bits: 32 bits
       horloge: 66MHz
       fonctionnalités: storage pm ahci_1.0 bus_master cap_list
       configuration: driver=ahci latency=64
       ressources: irq:22 portE/S:c000(taille=8) portE/S:b000(taille=4) portE/S:a000(taille=8) portE/S:9000(taille=4) portE/S:8000(taille=16) mémoire:fe9ffc00-fe9fffff
  *-ide
       description: IDE interface
       produit: SB7x0/SB8x0/SB9x0 IDE Controller
       fabriquant: Advanced Micro Devices, Inc. [AMD/ATI]
       identifiant matériel: 14.1
       information bus: pci@0000:00:14.1
       version: 00
       bits: 32 bits
       horloge: 66MHz
       fonctionnalités: ide msi bus_master cap_list
       configuration: driver=pata_atiixp latency=64
       ressources: irq:16 portE/S:1f0(taille=8) portE/S:3f6 portE/S:170(taille=8) portE/S:376 portE/S:ff00(taille=16)
  *-scsi:0
       identifiant matériel: 1
       nom logique: scsi0
       fonctionnalités: emulated
  *-scsi:1
       identifiant matériel: 2
       nom logique: scsi1
       fonctionnalités: emulated
  *-scsi:2
       identifiant matériel: 3
       nom logique: scsi2
       fonctionnalités: emulated
  *-scsi:3
       identifiant matériel: 5
       nom logique: scsi3
       fonctionnalités: emulated
  *-scsi:4
       identifiant matériel: 6
       nom logique: scsi5
       fonctionnalités: emulated

Alles anzeigen

thanks to all for your help

result of dmesg | grep -i ahci

Code

dmesg | grep -i ahci
[470817.561873] ahci 0000:00:11.0: set SATA to AHCI mode
[477480.255258] ahci 0000:00:11.0: set SATA to AHCI mode
[489237.660070] ahci 0000:00:11.0: set SATA to AHCI mode
[511057.668396] ahci 0000:00:11.0: set SATA to AHCI mode
[525487.660338] ahci 0000:00:11.0: set SATA to AHCI mode
[541364.441332] ahci 0000:00:11.0: set SATA to AHCI mode
[551092.577111] ahci 0000:00:11.0: set SATA to AHCI mode
[582285.990098] ahci 0000:00:11.0: set SATA to AHCI mode
[595459.049745] ahci 0000:00:11.0: set SATA to AHCI mode
[601085.086233] ahci 0000:00:11.0: set SATA to AHCI mode
[609550.734701] ahci 0000:00:11.0: set SATA to AHCI mode
[610619.111450] ahci 0000:00:11.0: set SATA to AHCI mode
[626288.921019] ahci 0000:00:11.0: set SATA to AHCI mode
[634393.945022] ahci 0000:00:11.0: set SATA to AHCI mode
[656559.169600] ahci 0000:00:11.0: set SATA to AHCI mode
[659076.270072] ahci 0000:00:11.0: set SATA to AHCI mode
[663963.471605] ahci 0000:00:11.0: set SATA to AHCI mode
[665031.678546] ahci 0000:00:11.0: set SATA to AHCI mode
[677296.827650] ahci 0000:00:11.0: set SATA to AHCI mode
[692270.178998] ahci 0000:00:11.0: set SATA to AHCI mode
[698572.403725] ahci 0000:00:11.0: set SATA to AHCI mode
[701984.220831] ahci 0000:00:11.0: set SATA to AHCI mode
[725414.369805] ahci 0000:00:11.0: set SATA to AHCI mode
[732275.255274] ahci 0000:00:11.0: set SATA to AHCI mode

Alles anzeigen

ryecoaaron · 6. November 2018

Zitat von Revers62

Do you kow if I can safely change IDE mode to AHCI in the bios ?

Yes and it is a much better option.

Revers62 · 6. November 2018

Zitat von ryecoaaron

Yes and it is a much better option.

I try to put ahci in my bios but when I do it I can't see the ssd.

But I don't think this is the problem because the kernel take lead when debian boot.

hum I will dig because I see 2 stanges thing : pata_atiixp

Code

dmesg | grep scsi
[    2.110061] scsi host0: pata_atiixp
[    2.110187] scsi host1: ahci
[    2.110297] scsi host2: pata_atiixp
[    2.110613] scsi host3: ahci
[    2.110761] scsi host4: ahci
[    2.110885] scsi host5: ahci
[    2.292452] scsi 2:0:0:0: Direct-Access     ATA      ST4000VN008-2DR1 SC60 PQ: 0 ANSI: 5
[    2.292629] scsi 2:0:1:0: Direct-Access     ATA      PNY CS900 240GB  0612 PQ: 0 ANSI: 5
[    2.591493] scsi 1:0:0:0: Direct-Access     ATA      ST4000VN008-2DR1 SC60 PQ: 0 ANSI: 5
[    2.592193] scsi 3:0:0:0: Direct-Access     ATA      ST4000VN008-2DR1 SC60 PQ: 0 ANSI: 5
[    2.592753] scsi 4:0:0:0: Direct-Access     ATA      ST4000VN008-2DR1 SC60 PQ: 0 ANSI: 5
[    2.605582] scsi 5:0:0:0: Direct-Access     ATA      ST4000VN008-2DR1 SC60 PQ: 0 ANSI: 5
[    5.416477] sd 2:0:0:0: Attached scsi generic sg0 type 0
[    5.416514] sd 2:0:1:0: Attached scsi generic sg1 type 0
[    5.416540] sd 1:0:0:0: Attached scsi generic sg2 type 0
[    5.416567] sd 3:0:0:0: Attached scsi generic sg3 type 0
[    5.416592] sd 4:0:0:0: Attached scsi generic sg4 type 0
[    5.416615] sd 5:0:0:0: Attached scsi generic sg5 type 0

Alles anzeigen

strange I have just one sata controller on my MB I have 5x same seagate hdd and 1 ssd and i can see 2 'link' are in udma5 :

Code

sudo hdparm -I /dev/sd{a,b,c,d,e,f} | grep -i udma
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5 udma6
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5 udma6
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6

hum waht 2 sata share an ATA ! like old ide device ! I will look in mobo option soon :

Code

ls -l /sys/block/sd* | sed -e 's@.*-> \.\..*/ata@/ata@' -e 's@/host@ @' -e 's@/target.*/@ @'
/ata2 2 sda
/ata2 2 sdb
/ata3 1 sdc
/ata4 3 sdd
/ata5 4 sde
/ata6 5 sdf

ok I see on a bios " if you want boot on the 5 or 6 port sata" use ahci mode.
the boot drive with OMV is on 6
when I put ahci on port 5 and 6 the SSD drive is not listed in boot drive.

I will change the sata port for the ssd to try.

Do you know If I can change sata port drive without problem ?

ryecoaaron · 6. November 2018

Zitat von Revers62

Do you know If I can change sata port drive without problem ?

Yes. OMV doesn't use the drive letters (sdX).

Revers62 · 7. November 2018

I swap the ssd with a HDD
All port is now on ahci

but bad performance

Code

/dev/sda:
 Timing buffered disk reads: 238 MB in  3.06 seconds =  77.78 MB/sec

this ssd is a PNY CS900 240GB SSD capable of sata 6 Gb/s but my Mb is just 3 Gb/s
I don"t see new firmware ...

Code

=== START OF INFORMATION SECTION ===
Device Model:     PNY CS900 240GB SSD
Serial Number:    PNY11182241350201421
LU WWN Device Id: 5 f8db4c 111801421
Firmware Version: CS900612
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:        Not in smartctl database [for details use: -P showall]
ATA Version is:   Unknown(0x0ff8) (minor revision not indicated)
SATA Version is:  SATA 3.2, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Wed Nov  7 02:55:43 2018 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

Alles anzeigen

I try some test on other disk

sda : ssd
sdb; hdd
mdo : raid5 ( 5x hdd )

Code

/dev/sda:
 Timing buffered disk reads: 238 MB in  3.06 seconds =  77.78 MB/sec
root@nas:~# hdparm -t /dev/sdb


/dev/sdb:
 Timing buffered disk reads: 572 MB in  3.01 seconds = 190.13 MB/sec
root@nas:~# hdparm -t /dev/md0


/dev/md0:
 Timing buffered disk reads: 2018 MB in  3.00 seconds = 672.47 MB/sec
root@nas:~#

Alles anzeigen

mb ; M5A78L-M LX

ryecoaaron · 7. November 2018

What version of OMV? What kernel?

Revers62 · 8. November 2018

Zitat von ryecoaaron

What version of OMV? What kernel?

cat /proc/version
Linux version 4.18.0-0.bpo.1-amd64 (debian-kernel@lists.debian.org) (gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1)) #1 SMP Debian 4.18.6-1~bpo9+1 (2018-09-13)

OMV : 4.1.13-1

ryecoaaron · 8. November 2018

I guess updating the kernel won't help since you are using the latest.

Revers62 · 12. November 2018

Zitat von ryecoaaron

I guess updating the kernel won't help since you are using the latest.

Hi Ryecoaaron

I just comeback with some information, Hdparm can use --offset

look at that !

without offset :

Code

hdparm -t --direct /dev/sda


/dev/sda:
 Timing O_DIRECT disk reads: 290 MB in  3.01 seconds =  96.42 MB/sec

with an offset of 1G :

Code

hdparm -t --direct --offset 1 /dev/sda


/dev/sda:
 Timing O_DIRECT disk reads (offset 1 GB): 380 MB in  3.07 seconds = 123.63 MB/sec
root@nas:~# hdparm -t --direct --offset 100 /dev/sda

and with an offset of 100G

Code

hdparm -t --direct --offset 100 /dev/sda


/dev/sda:
 Timing O_DIRECT disk reads (offset 100 GB): 664 MB in  3.00 seconds = 221.13 MB/sec
root@nas:~#

In my test I can see good speed start at 2G offset.

It's strange because it's an SSD and I can read :

--offset Offsets to given number of GiB (1024*1024*1024) when performing -t timings of device reads. Speed changes (about twice) along many mechanical drives. Usually the maximum is at the beginning, but not always. Solid-state drives (SSDs) should show similar timings regardless of offset.

I add this :

Code

fdisk -l /dev/sda
Disk /dev/sda: 223,6 GiB, 240057409536 bytes, 468862128 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
Disklabel type: dos
Disk identifier: 0xdb978318


Device     Boot     Start       End   Sectors   Size Id Type
/dev/sda1  *         2048 461002751 461000704 219,8G 83 Linux
/dev/sda2       461004798 468860927   7856130   3,8G  5 Extended
/dev/sda5       461004800 468860927   7856128   3,8G 82 Linux swap / Solaris

Alles anzeigen

exyu74 · 16. März 2019

Is it possible to apply steps as 1G-100G offset to ssd`s who where used as data storage or is only for OMV Os ?

Jetzt mitmachen!