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    linux文件树

    以前有意找这方面的资料,今天突然发现在系统中就有 linux系统用man hier solaris用man  filesystem 其结果如下        /      This is the root directory.  This is where the whole tree starts.        /bin   This directory contains executable programs which are needed in sin-               gle user mode and to bring the system up or repair it.        /boot  Contains static files for the  boot  loader.   This  directory  only               holds  the  files which are needed during the boot process.  The map               installer and configuration files should go to /sbin and /etc.        /dev   Special or device files,  which  refer  to  physical  devices.   See               mknod(1).        /dos   If  both MS-DOS and Linux are run on one computer, this is a typical               place to mount a DOS file system.        /etc   Contains configuration files which are local to the  machine.   Some               larger  software  packages, like X11, can have their own subdirecto-               ries below /etc.  Site-wide configuration files may be  placed  here               or in /usr/etc.  Nevertheless, programs should always look for these               files in /etc and you may have links for these files to /usr/etc.        /etc/opt               Host-specific configuration files for add-on applications  installed               in /opt.        /etc/sgml               This  directory  contains  the  configuration files for SGML and XML               (optional).        /etc/skel               When a new user account is created, files from  this  directory  are               usually copied into the user’s home directory.        /etc/X11               Configuration files for the X11 window system (optional).        /home  On  machines  with  home  directories  for  users, these are usually               beneath this directory, directly or  not.   The  structure  of  this               directory depends on local administration decisions.        /lib   This directory should hold those shared libraries th

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    X86 DBCA, NETCA GIVE JAVA HOTSPOT ERROR IF ON X86_64 HARDWARE

    在使用DBCA命令创建新的数据库时,DBCA命令无法启动。运行的环境是宿主机64bit+AMD cpu, 而客户机为Linux 32bit + Grid Infrastructure(32) + Oracle database software(32)的情形。原本想着32bit运行的会快一点,没想到Bug 8670579 在执行dbca时再一次被触发,根据Oracel描述,类似的NETCA也会触发这个Bug。 一、故障现象     [oracle@linux1 ~]$ dbca     #     # An unexpected error has been detected by HotSpot Virtual Machine:     #     #  SIGSEGV (0xb) at pc=0x9e0ea498, pid=4242, tid=3086584016     #     # Java VM: Java HotSpot(TM) Server VM (1.5.0_17-b02 mixed mode)     # Problematic frame:     # C  [libnnz11.so+0x3c498]     #     # An error report file with more information is saved as hs_err_pid4242.log     #     # If you would like to submit a bug report, please visit:     #   http://java.sun.com/webapps/bugreport/crash.jsp     #     Aborted     [oracle@linux1 ~]$

    02

    fio基础11

    rdma The RDMA I/O engine supports both RDMA memory semantics (RDMA_WRITE/RDMA_READ) and channel semantics (Send/Recv) for the InfiniBand, RoCE and iWARP protocols. falloc IO engine that does regular fallocate to simulate data transfer as fio ioengine. DDIR_READ does fallocate(,mode = keep_size,) DDIR_WRITE does fallocate(,mode = 0) DDIR_TRIM does fallocate(,mode = punch_hole) e4defrag IO engine that does regular EXT4_IOC_MOVE_EXT ioctls to simulate defragment activity in request to DDIR_WRITE event rbd IO engine supporting direct access to Ceph Rados Block Devices (RBD) via librbd without the need to use the kernel rbd driver. This ioengine defines engine specific options. gfapi Using Glusterfs libgfapi sync interface to direct access to Glusterfs volumes without options. gfapi_async Using Glusterfs libgfapi async interface to direct access to Glusterfs volumes without having to go through FUSE. This ioengine defines engine specific options. libhdfs Read and write through Hadoop (HDFS). The 'filename' option is used to specify host, port of the hdfs name-node to connect. This engine interprets offsets a little differently. In HDFS, files once created cannot be modified. So random writes are not possible. To imitate this, libhdfs engine expects bunch of small files to be created over HDFS, and engine will randomly pick a file out of those files based on the offset generated by fio backend. (see the example job file to create such files, use rw=write option). Please note, you might want to set necessary environment variables to work with hdfs/libhdfs properly. mtd Read, write and erase an MTD character device (e.g., /dev/mtd0). Discards are treated as erases. Depending on the underlying device type, the I/O may have to go in a certain pattern, e.g., on NAND, writing sequentially to erase blocks and discarding before overwriting. The w

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