[rescue] Some SCSI2SD Numbers
eddie_cottongim at cox.net
Wed Nov 1 02:41:47 CDT 2017
Since we were discussing various SCSI replacements, I got some speed
numbers for both the V5 and V5 SCSI2SD devices.
SPARCStation 20 built in SCSI controller - CDROM cable.
Patriot "Class 10" 32 GB SD Card
Linux (probably a 2.6ish kernel)
I tried a few file benchmarking tools, but didn't really like any of
them and got tired of building them, so I stuck to sequential speeds
The third number is the V6 in "turbo" mode, supposed to drive the SD
card faster and perhaps push the SCSI timings.
dd if=gcc-4.6.4.tar.bz2 bs=512 of=/dev/null
v5 72006076 bytes (72 MB) copied, 60.1136 seconds, 1.2 MB/s
v6 72006076 bytes (72 MB) copied, 14.6039 seconds, 4.9 MB/s
v6 6.1.1T 72006076 bytes (72 MB) copied, 14.231 seconds, 5.1 MB/s
dd if=curl.tar.gz bs=4096 of=/dev/null
v5 59883520 bytes (60 MB) copied, 51.6644 seconds, 1.2 MB/s
v6 59883520 bytes (60 MB) copied, 10.0634 seconds, 6.0 MB/s
v6 6.1.1T 59883520 bytes (60 MB) copied, 9.96611 seconds, 6.0 MB/s
dd if=/dev/zero bs=512 count=65536 of=testfile
v5 33554432 bytes (34 MB) copied, 18.3618 seconds, 1.8 MB/s
v6 33554432 bytes (34 MB) copied, 17.491 seconds, 1.9 MB/s
v6 6.1.1T 33554432 bytes (34 MB) copied, 15.1965 seconds, 2.2 MB/s
Its definitely worth using at least a Class 10 SD card. I also tried a
Class 4 card, and it topped out at about 1.2 mb/sec read, 850 kb/sec
write even on the V6.
The Class 10 card is supposed to do at least 10 mb/sec write, and at
least that much (maybe much more) read. These numbers didn't come as
close as I expected.
I saw some minor improvements with the latest V5 firmware (reflected above).
I hope these are interesting.
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