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RAID level 0 is used in high-performance applications where data safety is not critical Since RAID levels 2 and 4 are subsumed by RAID levels 3 and 5, the choice of RAID levels is restricted to the remaining levels Bit striping (level 3) is rarely used since block striping (level 5) gives as good data transfer rates for large transfers, while using fewer disks for small transfers For small transfers, the disk access time dominates anyway, so the bene t of parallel reads diminishes In fact, level 3 may perform worse than level 5 for a small transfer, since the transfer completes only when corresponding sectors on all disks have been fetched; the average latency for the disk array thus becomes very close to the worst-case latency for a single disk, negating the bene ts of higher transfer rates Level 6 is not supported currently by many RAID implementations, but it offers better reliability than level 5 and can be used in applications where data safety is very important The choice between RAID level 1 and level 5 is harder to make RAID level 1 is popular for applications such as storage of log les in a database system, since it offers the best write performance RAID level 5 has a lower storage overhead than level 1, but has a higher time overhead for writes For applications where data are read frequently, and written rarely, level 5 is the preferred choice Disk storage capacities have been growing at a rate of over 50 percent per year for many years, and the cost per byte has been falling at the same rate As a result, for many existing database applications with moderate storage requirements, the monetary cost of the extra disk storage needed for mirroring has become relatively small (the extra monetary cost, however, remains a signi cant issue for storage-intensive applications such as video data storage) Access speeds have improved at a much slower rate (around a factor of 3 over 10 years), while the number of I/O operations required per second has increased tremendously, particularly for Web application servers RAID level 5, which increases the number of I/O operations needed to write a single logical block, pays a signi cant time penalty in terms of write performance RAID level 1 is therefore the RAID level of choice for many applications with moderate storage requirements, and high I/O requirements RAID system designers have to make several other decisions as well For example, how many disks should there be in an array How many bits should be protected by each parity bit If there are more disks in an array, data-transfer rates are higher, but the system would be more expensive If there are more bits protected by a parity bit, the space overhead due to parity bits is lower, but there is an increased chance that a second disk will fail before the rst failed disk is repaired, and that will result in data loss.

ciscoasa(config)# group-policy policy_name attributes ciscoasa(config-group-policy)# webvpn ciscoasa(config-group-webvpn)# url-list {value URL_list_name | none}

Another issue in the choice of RAID implementations is at the level of hardware RAID can be implemented with no change at the hardware level, using only software modi cation Such RAID implementations are called software RAID However, there are signi cant bene ts to be had by building special-purpose hardware to support RAID, which we outline below; systems with special hardware support are called hardware RAID systems

As described earlier, there are two major categories of sales jobs: income producers and sales representativesThe underlying economic

The McGraw Hill Companies, 2001

If a URL list is not specified, then no URLs are displayed on the home page by default The url-entry command controls whether an address text box is displayed on the home portal so that users can type in their own URLs that the ASA will proxy:

11

ciscoasa(config)# group-policy policy_name attributes ciscoasa(config-group-policy)# webvpn ciscoasa(config-group-webvpn)# url-entry {enable | disable}

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By default an address text box is not displayed on a user s home page Other Home Page Elements If you don t want to create a home portal on the ASA, but want to use an internal server web page as the home page when the user logs in, configure the homepage command: