Du spørger måske også dig selv – hvorfor bør man overveje 12G diske i stedet for de gode gamle 6G ? HP har efterhånden introduceret 12G diske som 6G nærmer sig EOL. Men husk – en 12G disk kræver også en controller der supporterer 12G – ellers opnår man ikke nogen forbedret ydelse.
6G vs. 12G
The benefits of 12G SAS for HDDs has more to do with maximizing the amount of potential throughput that you can achieve with a logical volume (not individual device performance). For instance, the max throughput you can achieve with a single 6G link is ~525 MiB/s. The max for a 12G link is ~1050 MiB/s. So with eight SAS links (P440/H240 have 8 SAS links) you have the potential for more throughput with a 12G solution:
- 6G SAS * 8 links = ~4200 MiB/s
- 12G SAS * 8 links = ~8400 MiB/s // Note that a x8 PCIe 3.0 (8G per lane compared to SAS at 12G per link)
Tommelfingerreglen er derfor – en 12G storage controller med tilhørende 12G HDD’s giver dobbelt ydelse sammenlignet med 6G.
Spm – så står jeg naturligvis til rådighed.
Mvh
Jørgen
PS! Find mere info om HP harddrives her: HP_SAS_drives
