Current build:

Supermicro H12SSL-I

EPYC 7302P

96GB ECC 3200 Mhz

LSI 9300 16i HBA

Array;

Parity drive: 18 TB EXOS SAS

Disk 1: 18 TB Ultrastar DC HC550 SATA

Disk 2: 18 TB EXOS SATA

Disk 3: 18 TB EXOS SATA

Disk 4: 12 TB EXOS SATA

Disk 5: 12 TB Iron Wolf (not pro) SATA

Disk 6: 10 TB HGST He10 SAS

Disk 7: 8 TB Red Plus SATA

 

Bought the SAS EXOS drive with the intention of removing the 10 and 8 TB drives from the array and I expected to get better IO performance due to the SAS drive being the parity drive. I'm not using turbo write so drives not being used can spin down but ~150MB/s is not what I was expecting. Am I expecting to much? All drives are healthy. Enabling turbo write doesn't affect IO performance either.

 

Disks 0 (parity) through 4 are in a NORCO SS-500

Disks 5 though 7 are in another NORCO SS-500

 

I use these cables-  Internal Mini SAS to SATA Cable, SFF-8643 to SATA Breakout https://a.co/d/2hSam69

 

Edited April 4, 20232 yr by Pstark

Write speed to the array is always limited due to the overheads of updating parity in real time.  This is described in more detail here in the online documentation.

On 4/4/2023 at 5:31 PM, Pstark said:

Am I expecting to much ?

Yes, turn on turbo write would better a lot but don't expect so much.

 

You have 96G RAM, it may cache much data for some help.

Edited April 8, 20232 yr by Vr2Io