Morning.

 

I've seen various videos from Linus and other you tubers on using unraid so decided to give it a go.

 

I have a 12bay dell r510 which I have removed the h700 and dropped in an LSI HBA.

 

I have checked a disk in all slots and it reads them fine, so last night I dropped in a 500g disk into a random front bay and 2x 250gb Kington SSD's into the internal bays along with a 10gb Mellanox card.

 

So I knew from straight off I would be limited to the ready/write speeds of the single 500gb disk which topped out around 120-125mb but when I enabled cache on the share in either raid 1 or raid 0 performance of a copy to the server dropped to around 25-50mb.

 

I was under the impression adding cache sped up the copy process and then moved the data on schedule.

 

SO why copying 50gb of large MKV files is performance so poor??

 

 

tower-diagnostics-20190215-1244.zip

Edited February 15, 20197 yr by andymiller

I have tried setting the SSD's as array disks as opposed to cache disks and I can get a sustained 120+ on a 2.5inch 500gb laptop disk but only 30-50mb on both Kingston Fury ssd's.

 

 

 

Not sure about your speed issues.    However you should be aware that using SSDs in the main array is not officially supported if you also want parity. This is because the SSDs can interfere with keeping parity valid depending on how Trim is supported on your system with the SSDs models in question.

I checked its an LSI 9211-8i, does that make a difference??

 

Trim currently doesn't work whit SAS2 LSI HBAs, it a LSI Linux driver problem, it works with SAS3 HBAs but like all LSI only for SSDs that support deterministic reads after trim, more info here:

https://forums.unraid.net/topic/74493-samsung-ssd-hba-trim/?do=findComment&comment=720627

 

Edited February 15, 20197 yr by johnnie.black

so if i was gonna buy a HBA that supported it what would i be looking for??

LSI are the recommended HBAs for Unraid, you can get a 9300-8i if the SSDs support RZAT, alternatively connect them to the onboard SATA ports.

its an r510 so the internal drives are connected directly to the sas backplane and expander. doesnt appear to be a way to run any drives from the mainboard.