AIX系统使用USB闪存设备

AIX系统使用USB闪存设备Inthisarticle,IwilldemonstratehowtocreateaUSBmemorystickfilesystem(hereaftercalledUSBstick)IamusingAIX7.1witha4GBSandiskmemorystick.TheseUSBstickscancomeinsizesupto256GB.Memorysticksareusefulinmyopinionbecause:Theyareidealforfastdataaccess.Theycanbeusedindatatransferwherenetworkperformanceispoor.Theyaregreatforscratchortemporaryfilesystems.Theyarecheaperthanotheralternatives.Theonlydownsideisthattheydohavealimitedlifeinthatthewritecyclesonthesedrivestypicallylastaround8-10years,beforethememorycellswearout.Butastheyarecheaptobuy,thisisreallynotaconcernasyouwouldnodoubtreplacethemwithinthattimeperiodanyway.TheAIX6.1documentationstatesthatitsupportsthefollowingbrandedUSBsticks:SandiskLenovoKingstonHowever,Ihaveusedotherbrandedandnon-brandedUSBstickswithnoissuesfound.MountingaUSBstick（挂载USB设备）Besuretohavethecorrectfileset(s)installedbeforeinsertingyourUSBstick.Thefollowingfile-setsarerequiredtoaccessaUSBstick:（先确定USB设备驱动包是否安装）#lslpp-Ldevices.usbif.08025002.rteFilesetLevelStateTypeDescription(Uninstaller)devices.usbif.08025002.rte7.1.0.15AFUSBMassStorageDeviceSoftware#lslpp-Ldevices.common.IBM.usb.rteFilesetLevelStateTypeDescription(Uninstaller)devices.common.IBM.usb.rte7.1.0.15AFUSBSystemSoftwareInserttheUSBstickandruncfgmgrtodiscoverit:（插入USB闪存设备）#cfgmgr（刷新硬件设备）Oncediscovered,youhavetwodevices(theblockandrawdevice):ls-l*usbms0cr--r--r--1rootsystem44,0Aug2218:59rusbms0br--r--r--1rootsystem44,0Aug2218:59usbms0Itisalsoshowninthedevicesoutput:#lsdev|grepusb（列出所有USB接口的设备）usb0AvailableUSBSystemSoftwareusbhc0Available08-08USBHostController(33103500)usbhc1Available08-09USBHostController(33103500)usbhc2Available08-0aUSBEnhancedHostController(3310e000)usbms0Available2.1USBMassStorageForAIX5.3,thefirstUSBdeviceisshownasflashdrive0.Atthispoint,IcouldtreattheUSBstickasarawvolumeandwritedatatoit.However,inthisdemonstration,IwillmounttheUSBstickasafilesystem.IfeelthereisnoneedtocreatealogdeviceforthisUSBmount,sincethepurposeofascratchfilesystemisthatitistemporaryandthusspeedisoftheessencewhentransferringdata.TocreatetheUSBstickfilesystemusethefollowingcommand:（给USB设备添加文件系统）#mkfs-Vjfs2-oea=v2/dev/usbms0mkfs:destroy/dev/usbms0(yes)?Filesystemcreatedsuccessfully.3927736kilobytestotaldiskspace.Device/dev/usbms0:StandardemptyfilesystemSize:7855472512-byte(DEVBLKSIZE)blocksThepreviouscommandinitializedtheUSBstick.SelectYestodestroy,orratherinitialize,thedevice.Thefilesystemtypeisofjfs2type.Idonotbelievethatatypeofjfs2reallymattersforthistask,asthefilesystemisnotgoingtousethejfs2logdevice.Butasthisisthenormwhencreatingfilesystems,Icreateditasajfs2.Toensurethefilesystemisscalable,Ispecifythatwiththe'ea'option.Inthisexample,thedevicetouseistheUSBstickinserted,whichisusbms0.ForAIX5.3,thereisnoNOLOGoptioninthemountcommand.Next,mountthefilesystemspecifyingthatisittobemountedwithoutalogdevice;besuretocreatethedirectoryitistobemountedonfirst:#mkdir/usb_mnt（建立挂载点）#mount-olog=NULL/dev/usbms0/usb_mnt（挂载USB设备）#df-g|grepusb/dev/usbms03.753.731%41%/usb_mntIfyouwishtousealogdevicetomounttheusbstick,usetheinlinelog.Thisensuresthatitiscontainedwithinthefilesystem:（建立带日志的文件系统）#mkfs–olog=INLINE,ea=v2–Vjfs2/dev/usbms0mkfs:destroy/dev/usbms0(yes)?logform:Formatinlinelogfory?yFilesystemcreatedsuccessfully.3912376kilobytestotaldiskspace.Device/dev/usbms0:StandardemptyfilesystemSize:7824752512-byte(DEVBLKSIZE)blocks#mkdir/usb_mnt#mount-Vjfs2-olog=/dev/usbms0/dev/usbms0/usb_mntUnmountingamemorystickOnceyouhavefinishedusingtheaUSBstickfilesystem,unmountit,removeit,thendeletetheusbms0device:#umount/usb_mnt（卸载挂载的USB设备）#rmdev-dlusbms0（将USB设备在系统中移除）MountingapreviousinitializedmemorystickIfyouareinpossessionofamemorystickthatcontainsdatawhatwaspreviouslymountedasafilesystem,toaccessitsimplymountit.Besuretocreatethemountpointfirst.Forexample,assumetheUSBdeviceisinsertedinthesecondUSBslot,thenhavethedevicediscoveredasusbms1:#mkdir/usbstick#mount-olog=NULL/dev/usbms0/usbstickBacktotopConclusionUsingUSBsticksisagreatwhenyouwanttocreateafastreadaccessscratchfilesystemforprocessingormaybearawdevicetodumpsomefilesintofortransporttoanotherAIXsystem.USBsticksofferonesolutionwhereyouhaveapoornetwork,andyouneedtogetalargeamountofdatatransferred.