So I got some new disks:
Code:
[~]# dmesg | grep ^ad
ad0: 3811MB <CF CARD 4GB Ver3.06K> at ata0-master UDMA100
ad1: 1943MB <TRANSCEND 20100323> at ata0-slave UDMA66
ad6: 1430799MB <WDC WD15EADS-00S2B0 01.00A01> at ata3-master UDMA100 SATA 3Gb/s
ad10: 1430799MB <WDC WD15EADS-00S2B0 01.00A01> at ata5-master UDMA100 SATA 3Gb/s
Code:
[~]# diskinfo -c -t /dev/mirror/newdatad
/dev/mirror/newdatad
512 # sectorsize
10737418240 # mediasize in bytes (10G)
20971520 # mediasize in sectors
0 # stripesize
8192 # stripeoffset
1305 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
I/O command overhead:
time to read 10MB block 0.097558 sec = 0.005 msec/sector
time to read 20480 sectors 3.493613 sec = 0.171 msec/sector
calculated command overhead = 0.166 msec/sector
Seek times:
Full stroke: 250 iter in 1.851474 sec = 7.406 msec
Half stroke: 250 iter in 1.967489 sec = 7.870 msec
Quarter stroke: 500 iter in 3.482903 sec = 6.966 msec
Short forward: 400 iter in 2.997552 sec = 7.494 msec
Short backward: 400 iter in 3.032469 sec = 7.581 msec
Seq outer: 2048 iter in 0.392586 sec = 0.192 msec
Seq inner: 2048 iter in 0.393736 sec = 0.192 msec
Transfer rates:
outside: 102400 kbytes in 0.977659 sec = 104740 kbytes/sec
middle: 102400 kbytes in 1.071896 sec = 95532 kbytes/sec
inside: 102400 kbytes in 0.996447 sec = 102765 kbytes/sec
For comparison, here are two WD 500GB RE3 disks in the same system:
http://www.daemonforums.org/showpost...6&postcount=37
Transfer rates are faster, but seek times are slower. Actually, performance isn't that bad for the GP disks,
The GP disks are a *lot* quieter too. I had the 500GB disks in a "silent hard drive enclosure", which helped a bit with the noise, but the GP disks made *significantly* less noise without enclose than the RE disks inside the enclosure! (My system is now inaudible at ~75cm).
ad0 and ad1 are CF cards with a CF -> ATA converter I got off ebay for 90 cents.
The Transcend is a 300x card, the kingston is a cheap one I had lying around.
Diskinfo won't run on them ( diskinfo: read error or disk too small for test.: Input/output error), but here's what dd says:
This is the Transcend:
Code:
[~]# dd if=/dev/zero of=/TEST bs=1M count=100 glitch:1:33
100+0 records in
100+0 records out
104857600 bytes transferred in 4.592359 secs (22833058 bytes/sec)
The Kingston:
Code:
[~]# dd if=/dev/zero of=/var/tmp/TEST bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes transferred in 19.193520 secs (5463177 bytes/sec)
300x is supposed to be 40MB/s ... meh, not even close ... Still a lot faster than the Kingston ...
I got the kingston after some experiences with the ssd in my laptop, I have a memoryfs for /var/ and /tmp/, which works OK, but sometimes I ran into problems and some tweaking is required ... I got the kingston for /var/ and avoid all of that.
In hindsight, it might have been a better idea to get the 4GB Transcend (... But that one was 15 euros more expensive
).