Hello there!
I am doing some testing of OMV before using it as my main NAS OS. The hardware is an ODROID HC1 with a 2.5" WD SATA drive.
I am having a strange issue (at least it seems strange to me). I was testing the USB Backup plugin and the speeds were very underwhelming. Backing up a 5 GB share took roughly 15 minutes, equating a transfer rate of around 5 MB/s. I suspected that the problem might be related to the plugin itself, and therefore did some tests using plain rsync and cp to transfer files between the internal SATA drive and an attached USB thumb drive. The results are still disappointing:
sending incremental file list
P1000001.JPG
5,097,472 100% 98.57MB/s 0:00:00 (xfr#1, to-chk=223/224)
P1000002.JPG
6,557,696 100% 57.91MB/s 0:00:00 (xfr#2, to-chk=222/224)
P1000003.MP4
80,812,549 100% 92.08MB/s 0:00:00 (xfr#3, to-chk=221/224)
P1000004.JPG
5,696,000 100% 4.74MB/s 0:00:01 (xfr#4, to-chk=220/224)
P1000004.RW2
19,548,672 100% 16.09MB/s 0:00:01 (xfr#5, to-chk=219/224)
P1000005.JPG
5,396,992 100% 9.19MB/s 0:00:00 (xfr#6, to-chk=218/224)
P1000005.RW2
19,523,072 100% 3.34MB/s 0:00:05 (xfr#7, to-chk=217/224)
P1000006.JPG
6,629,376 100% 19.39MB/s 0:00:00 (xfr#8, to-chk=216/224)
P1000006.RW2
19,674,112 100% 6.56MB/s 0:00:02 (xfr#9, to-chk=215/224)
P1000007.JPG
5,747,200 100% 3.44MB/s 0:00:01 (xfr#10, to-chk=214/224)
P1000007.RW2
19,599,872 100% 5.16MB/s 0:00:03 (xfr#11, to-chk=213/224)
P1000008.JPG
4,806,144 100% 3.27MB/s 0:00:01 (xfr#12, to-chk=212/224)
P1000008.RW2
19,472,896 100% 4.84MB/s 0:00:03 (xfr#13, to-chk=211/224)
P1000009.JPG
4,546,560 100% 2.36MB/s 0:00:01 (xfr#14, to-chk=210/224)
P1000009.RW2
19,438,080 100% 6.89MB/s 0:00:02 (xfr#15, to-chk=209/224)
P1000010.JPG
5,449,216 100% 3.42MB/s 0:00:01 (xfr#16, to-chk=208/224)
P1000010.RW2
19,552,256 100% 5.30MB/s 0:00:03 (xfr#17, to-chk=207/224)
P1000011.JPG
5,474,304 100% 2.42MB/s 0:00:02 (xfr#18, to-chk=206/224)
P1000011.RW2
19,524,096 100% 6.87MB/s 0:00:02 (xfr#19, to-chk=205/224)
P1000012.JPG
3,952,128 100% 2.41MB/s 0:00:01 (xfr#20, to-chk=204/224)
P1000012.RW2
19,488,256 100% 3.77MB/s 0:00:04 (xfr#21, to-chk=203/224)
P1000013.JPG
3,673,600 100% 2.43MB/s 0:00:01 (xfr#22, to-chk=202/224)
P1000013.RW2
19,478,016 100% 4.07MB/s 0:00:04 (xfr#23, to-chk=201/224)
P1000014.JPG
4,618,752 100% 4.03MB/s 0:00:01 (xfr#24, to-chk=200/224)
P1000014.RW2
19,406,848 100% 6.13MB/s 0:00:03 (xfr#25, to-chk=199/224)
P1000015.JPG
5,358,592 100% 3.37MB/s 0:00:01 (xfr#26, to-chk=198/224)
P1000015.RW2
19,540,480 100% 4.61MB/s 0:00:04 (xfr#27, to-chk=197/224)
P1000016.JPG
4,749,312 100% 4.86MB/s 0:00:00 (xfr#28, to-chk=196/224)
P1000016.RW2
19,444,224 100% 3.89MB/s 0:00:04 (xfr#29, to-chk=195/224)
P1000017.JPG
4,443,136 100% 2.34MB/s 0:00:01 (xfr#30, to-chk=194/224)
As you can see, it starts out great. Then (I guess) some kind of write buffer gets filled up and performance takes a dive... It is almost as if it was buffering the transfer on the SD card that I use for OMV itself, although I think that I've been able to rule that option out by monitoring the disk usage during transfer.
My initial reaction was that this was just down to poor USB performance of the HC1 itself, but when I transfer files over the network to/from an SMB share on the thumb drive, I get reasonable USB 2 speed (~25 MB/s).
Any ideas?
Sorry If this thread went into the wrong forum category! Feel free to move it