Fixes Linux drive letter shifting (/dev/sda .. /dev/sdz) breaking Munin's smart_ wildcard plugin, eliminates dmesg Sense Key errors caused by non-ATA devices (e.g. STEC ZeusRAM NVRAM SLOGs), and provides non-destructive RRD telemetry migration on the Munin master.
In the Linux kernel SCSI subsystem (drivers/scsi/sd.c), drive letters (sda, sdb, ..., sdz) are assigned on a first-come, first-served basis as SCSI targets report TEST UNIT READY.