Old computer - slow transfers for sata

hi all,
I've set up a linux box with very old stuff. I'm talking about a Pentium II 350 MHz on a Asus P5B, 192 MB RAM. Though I have some new disks, with which I am experienceing slow transfers and I would like to know some advices on what could I do. Or maybe to know that the answer is: the cpu power is too low to have decent speeds.
Now, briefly what I've is:
- on a PCI, an old Promise FastTrak TX4 sata 150
- on it, 3 WD20EARS 2TB disks
- consider 2 of them. They have been partitioned with parted
- the partition method has been (for both): gpt label, mkpart with starting sector 2048s and end -1. This should have been guaranteed alignment for the 4K sectors of the drive
- filesystem is lvm for both. each is a single big pv on single vg on a single lv (consider one is the drive where I store all my photos - 2TB big, the other is the drive where I store backups of them - 2TB)
when I transfer files between them (tens of folders of hundreds of files size 600kb-4mb) for backup with rsnapshot I see the following, using iostat 5 -m:
avg-cpu: %user %nice %system %iowait %steal %idle
37.33 0.80 60.88 1.00 0.00 0.00
Device: tps MB_read/s MB_wrtn/s MB_read MB_wrtn
sda 0.00 0.00 0.00 0 0
sdb 83.03 5.69 0.01 28 0
sdc 19.96 0.00 5.63 0 28
scd0 0.00 0.00 0.00 0 0
sdd 14.57 0.19 0.02 0 0
dm-0 1440.52 0.00 5.63 0 28
dm-1 0.00 0.00 0.00 0 0
dm-2 1449.10 5.66 0.00 28 0
dm-3 1449.10 5.66 0.00 28 0
dm-4 2.00 0.00 0.01 0 0
now the question: is there a way to get better speeds and to lower cpu load?
please note that, according to hdparm, everything should be correct (just an output from hdparm -I is shown here, they are exactly the same):
ATA device, with non-removable media
Model Number: WDC WD20EARS-00MVWB0
Serial Number: WD-WCAZA2284951
Firmware Revision: 51.0AB51
Transport: Serial, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6
Standards:
Supported: 8 7 6 5
Likely used: 8
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
CHS current addressable sectors: 16514064
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 3907029168
Logical/Physical Sector size: 512 bytes
device size with M = 1024*1024: 1907729 MBytes
device size with M = 1000*1000: 2000398 MBytes (2000 GB)
cache/buffer size = unknown
Capabilities:
LBA, IORDY(can be disabled)
Queue depth: 32
Standby timer values: spec'd by Standard, with device specific minimum
R/W multiple sector transfer: Max = 16 Current = 0
Recommended acoustic management value: 128, current value: 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
Power-Up In Standby feature set
* SET_FEATURES required to spinup after power up
SET_MAX security extension
Automatic Acoustic Management feature set
* 48-bit Address feature set
* Device Configuration Overlay feature set
* Mandatory FLUSH_CACHE
* FLUSH_CACHE_EXT
* SMART error logging
* SMART self-test
* General Purpose Logging feature set
* 64-bit World wide name
* 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)
* Native Command Queueing (NCQ)
* Host-initiated interface power management
* Phy event counters
* NCQ priority information
DMA Setup Auto-Activate optimization
* Software settings preservation
* SMART Command Transport (SCT) feature set
* SCT LBA Segment Access (AC2)
* SCT Features Control (AC4)
* SCT Data Tables (AC5)
unknown 206[12] (vendor specific)
unknown 206[13] (vendor specific)
Security:
Master password revision code = 65534
supported
not enabled
not locked
not frozen
not expired: security count
supported: enhanced erase
402min for SECURITY ERASE UNIT. 402min for ENHANCED SECURITY ERASE UNIT.
Logical Unit WWN Device Identifier: 50014ee205346fd3
NAA : 5
IEEE OUI : 0014ee
Unique ID : 205346fd3
uname -a is:
Linux myhost 2.6.36-ARCH #1 SMP PREEMPT Sat Jan 8 13:16:43 UTC 2011 i686 Pentium II (Deschutes) GenuineIntel GNU/Linux
any help?
thanks a lot
Gemon

I will try adding some ram, I should have 128mb on my wife's brother pc.
Just some quick tests with dd to see if it is a problem of the pci channel - apparently it looks like. Tomorrow I will try to move one of the two disks on the other sata controller I have on the other pci slot.
First test is writing a sequential file to a WD20EARS (/dev/sdbx or /photo/photo as lvm)
Second test is reading from that same disk. 75 mb/s looks like a nice speed, considering the hosting pc anc pci slot bound at 133 mb/s bw
Third test is copying from one WD20EARS to the other
Fourth test is copying from one WD20EARS to the PATA drive where I have linux installed - consider this is on the motherboard controller and can do udma/33 only.
[root@myhost gemon]# dd if=/dev/zero of=/photo/photo/output.img bs=8k count=256k
262144+0 records in
262144+0 records out
2147483648 bytes (2.1 GB) copied, 146.265 s, 14.7 MB/s
[root@myhost gemon]# dd if=/photo/photo/output.img of=/dev/null bs=8k count=256k
262144+0 records in
262144+0 records out
2147483648 bytes (2.1 GB) copied, 28.3661 s, 75.7 MB/s
[root@myhost gemon]# dd if=/photo/photo/output.img of=/backup-photo/output.img bs=8k count=256k
262144+0 records in
262144+0 records out
2147483648 bytes (2.1 GB) copied, 93.4719 s, 23.0 MB/s
[root@myhost gemon]# dd if=/photo/photo/output.img of=/home/gemon/output.img bs=8k count=256k
262144+0 records in
262144+0 records out
2147483648 bytes (2.1 GB) copied, 116.291 s, 18.5 MB/s
tomorrow I'll redo some tests with the secondo wd20ears on the other pci slot.
thanks everybody for the first answers
Gemon
PS: filesystem is ext4 on all those lvm logical volumes

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Begin forwarded message:
From: Frances Topping <[email protected]>
Subject: Re: - Old computer I had is OSX Snow Leopard with Entourage. New one is OSX Mavericks. Using Mail where are my addresses and old address book. Transferred old computer backup by Time Machine and other things work? Can't see a symbol for address book.
Date: August 25, 2014 at 9:46:01 AM EDT
To: discussions-replies <[email protected]>
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Old computer - slow transfers for sata

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