poor write performance on Fusion MPT SAS RAID controllers
If you’re have a hardware RAID controller using mptsas module on your Linux server, you may notice your write performance is extremely poor – i.e. some database workloads can be 30x slower than on other servers (i.e. using Linux software RAID).
An example card below – lspci shows:
02:05.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068 PCI-X Fusion-MPT SAS (rev 01)
How can you fix it? See below.
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