Eu tenho 2x Seagate Barracuda 1TB 1000GB 7200RPM 64MB SATA3 HDs em um servidor do Ubuntu 16.04 ( Dell Poweredge 400SC ).
Ao copiar arquivos usando rsync de um disco para outro, estou obtendo velocidades de 25-30 Mb / s. Da leitura, parece que eu deveria ser capaz de conseguir o dobro disso.
Como devo proceder para otimizar essa configuração para aumentar a velocidade de transferência?
// lsblk
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 931G 0 part /
├─sda2 8:2 0 1K 0 part
└─sda5 8:5 0 509M 0 part [SWAP]
sdb 8:16 0 931.5G 0 disk
├─sdb1 8:17 0 20G 0 part
└─sdb2 8:18 0 910.5G 0 part /mnt
Li sobre ativar o DMA, mas parece que não consigo fazer isso no sistema.
// hdparm -Tt /dev/sdb
/dev/sdb:
Timing cached reads: 1098 MB in 2.00 seconds = 548.31 MB/sec
Timing buffered disk reads: 346 MB in 3.02 seconds = 114.69 MB/sec
Tentar ativar o DMA em sdb faz o seguinte.
// hdparm -d1 /dev/sdb
/dev/sdb:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Inappropriate ioctl for device
HDIO_GET_DMA failed: Inappropriate ioctl for device
// hdparm -i / dev / sdb
/dev/sdb:
Model=ST1000DM003-1SB102, FwRev=CC43, SerialNo=Z9A4EEL4
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=off
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=1953525168
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=yes: unknown setting WriteCache=enabled
Drive conforms to: unknown: ATA/ATAPI-4,5,6,7
// dmesg | grep SATA
[ 2.074207] ata3: SATA max UDMA/133 cmd 0xfe00 ctl 0xfe10 bmdma 0xfea0 irq 18
[ 2.080635] ata4: SATA max UDMA/133 cmd 0xfe20 ctl 0xfe30 bmdma 0xfea8 irq 18
// lspci
00:00.0 Host bridge: Intel Corporation 82875P/E7210 Memory Controller Hub (rev 02)
00:01.0 PCI bridge: Intel Corporation 82875P Processor to AGP Controller (rev 02)
00:06.0 System peripheral: Intel Corporation 82875P/E7210 Processor to I/O Memory Interface (rev 02)
00:1d.0 USB controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Controller #3 (rev 02)
00:1d.3 USB controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Controller #4 (rev 02)
00:1d.7 USB controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev c2)
00:1f.0 ISA bridge: Intel Corporation 82801EB/ER (ICH5/ICH5R) LPC Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801EB/ER (ICH5/ICH5R) IDE Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801EB (ICH5) SATA Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801EB/ER (ICH5/ICH5R) SMBus Controller (rev 02)
00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller (rev 02)
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Rage XL PCI (rev 27)
02:0c.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet Controller (rev 02)
// versão SATA
// smartctl -a /dev/sdb | grep SATA
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 1.5 Gb/s)