Re: Conglomerate files - reiserfs (was: all sorts of things)

Rajeev Atluri (rajeev@cc859044-a.flrtn1.occa.home.com)
Wed, 30 Jun 1999 23:09:14 -0700 (PDT)

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> For example computer A shares a block device that is accessed by computers
> B, C, and D. They all access a file-system on the block device. Can
> locking be implemented with only read/writes to the disk? Do any existing
> file-systems do this? Are there any strategies to avoid problems from
> caching reads or caching writes? Do any existing file-systems do this?

GFS (Global File System) does this with the help of special drive
firmware. They are trying to push dlocks (device locks) into the scsi
standard so multi-initiator setups would be possible without performance
degradation that would be unavoidable if the storage media is used for
implementing locking.

There are also some commercial offerings that have this
kind of functionality.

Regards,
Rajeev

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