I want to know if 20MB/s is slow or normal for unraid

 

 

IO meter and Terra Copy also match performance wise. What I did not like was the occaisional lag I was seeing. I tested unraid on two systems, the faster one being a Athalon XP dual core 2400(4800), with 2GB of Ram, all 3 drives were onboard SATA.

The other system was using a pci promise card tx4 SATA2, same performance on the same 1TB drives with the 1.5Gbps limit jumper removed.

I also ran "sleep 30; blockdev --setra 2048 /dev/md1"

to both drives in hopes of seeing better performance but not really. I guess I will need a faster sata2 card.

 

hdparm -tT /dev/sda

 

/dev/sda:

Timing cached reads: 1776 MB in 2.00 seconds = 888.73 MB/sec

Timing buffered disk reads: 44 MB in 3.12 seconds = 14.10 MB/sec

 

/dev/sdb:

Timing cached reads: 1728 MB in 2.00 seconds = 864.49 MB/sec

Timing buffered disk reads: 60 MB in 3.09 seconds = 19.40 MB/sec

root@Tower:~# hdparm -tT /dev/sdc

 

/dev/sdc:

Timing cached reads: 1752 MB in 2.00 seconds = 876.71 MB/sec

Timing buffered disk reads: 56 MB in 3.03 seconds = 18.46 MB/sec

You don't indicate whether you were measuring read performance or write performance, which can be very different under some conditions.  Write performance to a parity-protected unRAID data drive can occasionally suffer lags, but that is the only condition normally, where lags might occur.

 

The hdparm test is a straight read performance measure, independent of the setra or most other conditions.  For your drives, it should be around 80MB/s or greater, so your speeds of 14, 19, and 18MB/s indicate something is really wrong or mis-configured.

 

Please post a syslog, and perhaps we can help diagnose.

BTW, I was running the Beta Version. I will retest tonight and see if the performance is the same.

Then I will upload my logs. I removed the PCI video card, and replaced it with an agp card, just in case.

I also disabled onboard peripherals that were using the same IRQ's. Thanks ahead for your help.

If I can get 60-80MB/s write speeds, then I will buy unraid, as it will server my purpose.

Those were write speeds.

 

BTW, I was running the Beta Version. I will retest tonight and see if the performance is the same.

Then I will upload my logs. I removed the PCI video card, and replaced it with an agp card, just in case.

I also disabled onboard peripherals that were using the same IRQ's. Thanks ahead for your help.

If I can get 60-80MB/s write speeds, then I will buy unraid, as it will server my purpose.

Those were write speeds.

 

 

You will not get 60-80MB/sec write speeds.  You will get 10-15, maybe a bit higher.  You can, however, leverage the cache drive feature to get higher than that but it won't be 60-80.

 

 

Bill

I believe I have a MB issues. so for now, please disregard my previous post. It seems my server does not always boot 100% of the time, and it is acting up.

It used to be 100% solid over the last 6 years. Time to upgrade.

Is unraid supported in HP ML380 G3 or G4 configs or Dell PowerEdge Xeon 3+Ghz?

I look forward to the day when unRaid can use 4GB or More of ram as a cache for transferring files at peak performance.

 

Cheers for now.