几个linux内核参数

raid=noautodetec libata.force=3.0G mem=1G

不检测raid， sata限制3.0G 内存限制1G

https://serverfault.com/questions/400338/how-to-reduce-the-sata-link-speed-of-drive-in-centos

Specifically
    libata.force=   [LIBATA] Force configurations.  The format is comma
            separated list of "[ID:]VAL" where ID is
            PORT[.DEVICE].  PORT and DEVICE are decimal numbers
            matching port, link or device.  Basically, it matches
            the ATA ID string printed on console by libata.  If
            the whole ID part is omitted, the last PORT and DEVICE
            values are used.  If ID hasn't been specified yet, the
            configuration applies to all ports, links and devices.

            If only DEVICE is omitted, the parameter applies to
            the port and all links and devices behind it.  DEVICE
            number of 0 either selects the first device or the
            first fan-out link behind PMP device.  It does not
            select the host link.  DEVICE number of 15 selects the
            host link and device attached to it.

            The VAL specifies the configuration to force.  As long
            as there's no ambiguity shortcut notation is allowed.
            For example, both 1.5 and 1.5G would work for 1.5Gbps.
            The following configurations can be forced.

            * Cable type: 40c, 80c, short40c, unk, ign or sata.
              Any ID with matching PORT is used.

            * SATA link speed limit: 1.5Gbps or 3.0Gbps.

            * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
              udma[/][16,25,33,44,66,100,133] notation is also
              allowed.

            * [no]ncq: Turn on or off NCQ.

            * nohrst, nosrst, norst: suppress hard, soft
                          and both resets.

            * dump_id: dump IDENTIFY data.

            If there are multiple matching configurations changing
            the same attribute, the last one is used.