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- Newsgroups: comp.unix.cray
- Path: sparky!uunet!timbuk.cray.com!hemlock.cray.com!gme
- From: gme@aspen.cray.com (Jim Gmeinder)
- Subject: Re: DMF and Clustered File Systems
- Message-ID: <1992Sep8.100032.5331@hemlock.cray.com>
- Originator: gme@aspen
- Lines: 35
- Organization: Cray Research, Inc.
- References: <1992Sep4.131659.122@inet.d48.lilly.com>
- Distribution: world,local
- Date: 8 Sep 92 10:00:31 CDT
-
-
- In article <1992Sep4.131659.122@inet.d48.lilly.com>, rz63633@stewball.d50.lilly.com (Gregg A. Mantock) writes:
- > Does anyone know if a file can span accross multiple devices
- > in a clustered file system? Say that a file is created on a
- > particular device in a clustered file system. As the file
- > continues to grow it fills the device that it was created on.
- > Will the remainder of the file be written to one of the other
- > devices in the cluster, or will the process writing to the
- > file abend?
- >
- > This becomes an interesting situation when the Data Migration
- > Facility and File System Monitoring are running on the
- > clustered file system. Fsmon shows %used based on the whole
- > cluster of devices, but df shows the %free on each device.
- > Can I assume that fsmon knows what it is doing and that the
- > clustered file system need not be migrated until the entire
- > cluster hits the warning/critical threshold?
- >
- > Thanks,
- > Gregg
- > --
-
- Yes, the clustered file system need not be migrated until the entire
- cluster's warning/critical thresholds are reached. DMF manages a clustered
- file system as it would a normal (i.e. contained on one device) filesystem.
- Therefore, you want DMF actions started by fsmon, since it also views
- the cluster as a single filesystem.
-
- Hope this helps,
- Jim
- --
- --------------------------------------------------------------------------
- Jim Gmeinder Cray Research, Inc. (612)-683-5581
-
-
-