TAILIEUCHUNG - Red Hat Linux Networking and System Administration Third Edition phần 7

Phần này cho bạn thấy làm thế nào để cấu hình một máy chủ NFS, xác định Mô tả Tạo một phân vùng, tiểu học, hợp lý, hoặc mở rộng bằng cách chỉ định kích thước bắt đầu từ kết thúc bằng MB. Tạo ra một phân vùng chính, hợp lý, hoặc mở rộng bằng cách chỉ định kích thước bắt đầu | 582 Chapter 25 using Gigabit Ethernet GigE whenever possible will improve Internet server service performance. Finally using a higher-performance filesystem on the directories that hold email can substantially improve performance. For example ext3 does a great job on mail partitions because short-lived mail files might not even need to be created in the filesystem if they pass through the filesystem journal quickly enough. ReiserFS can be a good idea for mail partitions on which hundreds of thousands of tiny files live in the same directories. Optimizing LDAP Services Several items in the slapd configuration can be tweaked to give better server performance. The items shown in the following list show configuration directives that can be modified for performance reasons Cache size modification You can increase the size of the cache using the cachesize directive in . For example the following directive sets the number of LDAP entries stored in the cache to 100 000 cachesize 100000 Disk subsystem As suggested elsewhere in this chapter replace IDE disks with SCSI disks and replace or augment SCSI disks with FibreChannel. If SCSI and FibreChannel are too rich for your budget using Serial ATA SATA drives and a SATA controller of course hits a good middle ground because SATA is faster than IDE and less expensive than SCSI and FibreChannel. If you have multiple LDAP data stores situate each store on its own disk and if possible its own dedicated I O controller in order to minimize I O contention with other processes. Filesystem tuning On filesystems that support it disable updating file access and modification timestamps which will decrease the number of file operations that have to be performed by two-thirds. Fewer CPU cycles spent on bookkeeping means more CPU cycles spent doing actual LDAP-related work. Indexing With limits indexes increase performance but at the cost of additional memory disk and CPU usage. Accordingly don t index data you don t often search.

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