vì vậy chúng tôi sẽ xem xét một số chi tiết trong phần này. Ngoài ra, đọc những ví dụ này sẽ cung cấp cho bạn với một sự hiểu biết lớn hơn về cách thức hoạt động SNMP, bất kể thực hiện cụ thể. Các công cụ đầu tiên chúng tôi sẽ xem xét là snmptranslate, cung cấp thông tin về cấu trúc MIB và các tổ chức của nó (nhưng không | Soft updates have the advantage that the only filesystem inconsistencies that can be caused by a crash are inodes and data blocks marked as in use that are actually free consult the papers listed in the earlier footnote to see why this is true . Because these errors are benign the filesystem can be made available for immediate use after rebooting. A background process similar to fsck is used to locate and correct these errors. Default Local Filesystems Table 10-2 lists the characteristics of thedefault local filesystem types for the various Unix versions. Table 10-2. Default local filesystem characteristics Item AIX FreeBSD HP-UX Linux Red Hat Linux SuSE Solaris Tru64 Tru64 Type jfs ufs vxfs ext3 reiserfs ufs ufs advfs Journaled yes soft updates yes yes yes yes no yes 64 bit files 2 GB yes yes yes yes yes yes yes yes Dynamic resizing yes yes yes yes yes yes 81 no yes 9 Sparse file support yes yes yes no yes yes yes yes NFSv3 support yes yes yes yes yes yes yes yes dump version provided yes yes yes yes no yes yes yes 8 Solaris 9 only 9 Requires the AdvFS utilities additional cost option I l@ve RuBoard PREVIOUS I NEXT F I l@ ve RuBoard Managing Filesystems This section covers such topics as mounting and dismounting local and remote filesystems the filesystem configuration file and checking local filesystem integrity with the fsck utility in other words the nitty gritty details of managing filesystems. Mounting and Dismounting Filesystems Mounting is the process that makes a filesystem s contents available to the system merging it into the system directory tree. A filesystem can be mounted or dismounted that is it can be connected to or disconnected from the overall Unix filesystem. The only exception is the root filesystem which is always mounted on the root directory while the system is up and cannot be dismounted. Thus in contrast to some other operating systems mounting a Unix filesystem does more than merely make its data available. Figure 10-1
