lyndon@cs.AthabascaU.CA (Lyndon Nerenberg) (12/06/89)
Does anyone have a compendium of "typical" errors returned when an
I/O operation to an NFS filesystem fails? I'm particularly interested
in differences between soft and hard mounted remote filesystems, and
whether the (Unix) NFS filesystem implementation differentiates
between "soft" (retryable) and "hard" (physical device) errors.
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Lyndon Nerenberg VE6BBM / Computing Services / Athabasca University
{alberta,decwrl,lsuc}!atha!lyndon || lyndon@cs.AthabascaU.CA
The Connector is the Notwork.LUBKT@vax1.cc.lehigh.edu (12/07/89)
In article <1292@atha.AthabascaU.CA>, lyndon@cs.AthabascaU.CA (Lyndon Nerenberg) writes: > ..................................... I'm particularly interested > in differences between soft and hard mounted remote filesystems, and > whether the (Unix) NFS filesystem implementation differentiates > between "soft" (retryable) and "hard" (physical device) errors.... I do not understand the way you defined soft or hard mounts as "retryable" and "physical device" respectively. And, I do not think that is appropriate. As a general practice, soft mount is never tried if the mounted file system is read-write. If the network error occurs and the file system is mounted soft, and if you have some data on the mounted file system unsaved, then you have a chance of losing some/all of your data. If the file system is mounted "hard", the attempt (to save, taking the bove example) continues untils the network error is resolved. As you can see, this can lead your client machine to hang if server does not respond soon. If the server responds after sufficiently long time, you may get an error "Stale File handle" if you try to access the file system. In that case, you will have to dismount the file system and then, re-mount the it again. Usually, read-only file systems are mounted soft. Well, while addressing the NFS question, does any one know how to mount with interrupt enabled (hitting control-C should abort the mount). I have heard it is common for Sun or Vax machines. Does any one know if this can be done for Apple Unix (A/UX), version 1.1? Binod Taterway, User Consultant, Lehigh University Computing Center Lehigh University, Bethlehem, PA 18015. Tel: (215) 758-3984 E-mail: LUBKT@vax1.cc.lehigh.EDU (Internet), BT00@lehigh.BITNET