What is Nfsiostat?
What is Nfsiostat?
The nfsiostat command works as iostat command for the NFS mount points on the server. It uses the file /proc/self/mountstats as input and provides information about the input/output performance of NFS shares mounted in the system.
What is NFS latency?
The NFS response time should be less than 50 ms on average, to allow for NFS protocol processing and network transmission time. The disk response should be less than 40 ms. The average service time in milliseconds is a function of the disk.
What is Retrans in Nfsiostat?
The most important statistics to look out for are: retrans – This is the number of retransmissions. avg RTT (ms) – This is the duration from the time that the client’s kernel sends the RPC request until the time it receives the reply. This includes the RTT.
Is samba an NFS?
NFS is a file-sharing protocol that enables the users to access their clients’ files through a network, while Samba is a software that enables not only sharing of files but also sharing of printers.
What is Rsize and Wsize in NFS?
rsize: The number of bytes NFS uses when reading files from an NFS server. wsize: The number of bytes NFS uses when writing files to an NFS server. The wsize is negotiated between the server and client to determine the largest block size that both can support.
How can I make NFS faster?
Start plenty of NFS daemon threads.
- If read dominates, add RAM on the clients to cache more of the file systems and reduce read operations.
- If write dominates, make sure the clients are using noatime,nodiratime to avoid updating access times.
- If getattr dominates, tune the attribute caches.
What is nfsiostat command in Linux?
The nfsiostat command works similarly to the iostat command, but is used for the NFS mount points on the server. It uses the file /proc/self/mountstats as input and provides information about the input/output performance of NFS shares mounted on the system.
How to use nfsiostat with ISO 8601?
The nfsiostat command will use the ISO 8601 format (YYYY-MM-DD) instead. The timestamp displayed with option -t will also be compliant with ISO 8601 format. When this variable is set, transfer rates are shown in 512-byte blocks instead of the default 1K blocks. /proc filesystem must be mounted for nfsiostat to work.
How to run nfsiostat continuously at the interval 5 seconds?
For example, to run the nfsiostat command continuously at the interval of 5 seconds: If you do not want nfsiostat to run continuously and only want a finite number of reports, use the [count] argument with the [interval] argument. For example, to produce 10 reports at interval of 5 seconds use the below command.
How to display nfsiostat page cache related statistics?
Check nfsiostat Man Page for more info. If you want to sort NFS mount point by ops/sec then you need to use nfsiostat -s command as shown below. -s : Sort NFS mount points by ops/second. Check nfsiostat Man Page for more info. If you want to display all the page cache related statistics then you need to use nfsiostat -p command as shown below.