RadiSys ATCA-5400 RTM Spezifikationen PDF herunterladen (Seite 35)

Redundant user flash

TheCPMoptionallyincludestwobanksofuserflashmemor ywithupto16GBstorage

capacityforeachbank.Eachredundantflashbankcanbeusedtostoreanoperating

systemandapplicationimage,allowingittofunctionasabootdevice.

Eachuserflashconsistsofanembeddeduniv e rsalserialbus(eUSB)flashmodule.The

eUSBflashmemoryhasasmallformfactor,lowpowerconsumption,andfastaccesstime.

TheI/OcontrollerhubusesstandardUSB2.0connectionstocommunicatewiththeuser

flash.

Note:TheCPMincludesawrite‐protectionjumperforeachmemorybank.Referto

Jumpersettingsonpage 152formoreinformation.

Access to storage devices from Linux

TheCPMstoragedevicesareaccessiblefromLinuxasformattablemedia,dependingon

youroperatingsystemconfiguration.

Device type naming

TheLinuxdevicetypeisdeterminedbythephysicaldevicetypeinstalled.TheLinuxfile

systemnamesmaybe/dev/sd<drive><partition>forSCSIdevicesor/dev/

hd<drive><partition>forharddisks.USBandSASdevicesareconsideredSCSIdevices(/

dev/sd<drive><partition>).

Order of device discovery and naming

TheorderinwhichLinuxdiscoversthestoragedevicesistheorderthatitassignsthem

alphabeticalnames,startingwiththesuffix“a”.Forexample,thefirstSCSIdevice

discoveredisnamed/dev/sda,andthesecondisnamed/dev/sdb.

Identifying the assigned name for a specific device

Toidentifythedrivenameforaspecificdevice,usetheLinuxcommand:

cat/proc/partitions

Lookintheresultsforadrivesizethatcloselymatchesthedevice.

ToidentifytheSCSIdevicesbydevicemodel,usethecommand:

cat/proc/scsi/scsi

Thedevicesarelistedinorder,startingwith/dev/sda.

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RadiSys ATCA-5400 RTM Spezifikationen Seite 35