IBM System x3500 M4 12Internal disk storage optionsThe IBM System x3500 M4 server supports the following internal storage configurations:8x 3.5" Simple Swap SATA hard drive bays (only available in CTO)z8x 3.5" hot-swap SAS/SATA hard drive baysz8x 3.5" hot-swap SAS/SATA drive bays + 8x 2.5" Slim-SFF SAS/SATA hot-swap drive bays (onlyzavailable in CTO, requires two RAID controllers)8x 2.5" Slim-SFF SAS/SATA hot-swap hard drive baysz16x 2.5" Slim-SFF SAS/SATA hot-swap hard drive baysz24x 2.5" Slim-SFF SAS/SATA hot-swap hard drive baysz32x 2.5" Slim-SFF SAS/SATA hot-swap hard drive bayszFigure 5 shows these configurations.Figure 5. Internal drive configurationsBackplanesStandard models of x3500 M4 ship with eight (all models except C4x) 2.5" Slim-SFF SAS/SATA hot-swapdrive bays. Model C4x ships with eight 3.5" SAS/SATA hot-swap hard drive bays. The following tableshows internal storage expansion options available for the x3500 M4 server.Table 6. Internal storage expansion optionsPartnumberName Maximumquantitysupported94Y5978 Additional 8 x 2.5” Hot-Swap SAS/SATA Upgrade Kit for 16 or 24 HDDs (shown in Figure 5as an Upgrade 1 used in configurations 4, 5, and 6)281Y7010 Additional 8 x 2.5" Hot-Swap SAS/SATA Upgrade Kit for 32 HDDs (shown in Figure 5 as anUpgrade 2 used in configuration 6)1