Various factors that affect the NAS performance and availability in detail

1.Number of Hops -

A large number of hops can increase latency because IP processing is required at each hop, adding to the delay caused at the router.

2.Authentication with a directory service such as LDAP ,acture directory or NIS -

The authentication service must be available on the network ,with adequate bandwidth and must have enough resources to accomodate the authentication requests are presented to the servers,increasing latency.Authentication adds to latency only when authentication occurs.

3.Retransmission -

Link errors,buffer overfloes & flow control mechanisms can result in retransmission.This causes packets that have not reached the specofoed destination to be resent.Care must be taken when configuring parameters for speed & duplex settings on the network devices and the NAS heads so that they match.Impropoer configuration may results in errors & retransmission ,adding to latency.

4.Overutilized routers & switches -

The amount of time that can be overutilized device in a network takes to respond is always more than the response time of an optimally utilized or underutilized device.Network administrators can view vendor-specific statistics to determine the utilization of switch & routers in a network.Additional devices should be added if the current devices are overutilized.

5.File/directory lookup & metadata requests -

NAS clients access files on NAS devices.The processing required before reaching the appropriate file or directory can cause dealys.Sometimes a delay is caused by deep directory structures & can be resolved by flattering the directory structure & can be resolved by flattering the directory structure.Poor file sytem layout & an overutilized disk system can also degrade performance.

6.Overutilized NAS devices -

Clients accessing multiple files can cause high utilization levels on a NAS devices which can be determined by viewing utilization statistics.High utilization level can be caused by a processing file system.

7.Overutilized clients -

The client accessing CIFS or NFS data may also be overutilized.An overutilized client requires longer time to process the responses required from the server,increasing latency.Specific performance monitoring tools are available for various operating systems to help determine the utilization of client reasources.

Various factors that affect the NAS performance and availability in detail

1.Number of Hops -

A large number of hops can increase latency because IP processing is required at each hop, adding to the delay caused at the router.

2.Authentication with a directory service such as LDAP ,acture directory or NIS -

The authentication service must be available on the network ,with adequate bandwidth and must have enough resources to accomodate the authentication requests are presented to the servers,increasing latency.Authentication adds to latency only when authentication occurs.

3.Retransmission -

Link errors,buffer overfloes & flow control mechanisms can result in retransmission.This causes packets that have not reached the specofoed destination to be resent.Care must be taken when configuring parameters for speed & duplex settings on the network devices and the NAS heads so that they match.Impropoer configuration may results in errors & retransmission ,adding to latency.

4.Overutilized routers & switches -

The amount of time that can be overutilized device in a network takes to respond is always more than the response time of an optimally utilized or underutilized device.Network administrators can view vendor-specific statistics to determine the utilization of switch & routers in a network.Additional devices should be added if the current devices are overutilized.

5.File/directory lookup & metadata requests -

NAS clients access files on NAS devices.The processing required before reaching the appropriate file or directory can cause dealys.Sometimes a delay is caused by deep directory structures & can be resolved by flattering the directory structure & can be resolved by flattering the directory structure.Poor file sytem layout & an overutilized disk system can also degrade performance.

6.Overutilized NAS devices -

Clients accessing multiple files can cause high utilization levels on a NAS devices which can be determined by viewing utilization statistics.High utilization level can be caused by a processing file system.

7.Overutilized clients -

The client accessing CIFS or NFS data may also be overutilized.An overutilized client requires longer time to process the responses required from the server,increasing latency.Specific performance monitoring tools are available for various operating systems to help determine the utilization of client reasources.