Messages in this thread | | | Date | Wed, 17 Dec 2003 16:25:11 -0700 | From | jshankar <> | Subject | RE: ext3 file system |
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Hello,
Please provide some more insight.
Suppose a filesystem issues a write command to the disk with around 10 4K Blocks to be written. SCSI device point of view i don't get what is the parallel I/O. It has only 1 write command. If some other sends a write request it needs to be queued. But the next question arises how the write data would be handled. Does it mean the SCSI does not give a response for the block of data written. In otherwords does it mean that the response would be given after all the block of data is written for a single write request.
Thanks Jay
>===== Original Message From Mike Fedyk <mfedyk@matchmail.com> ===== >On Wed, Dec 17, 2003 at 05:25:49PM -0500, Richard B. Johnson wrote: >> to the physical media. There are special file-systems (journaling) >> that guarantee that something, enough to recover the data, is >> written at periodic intervals. > >Most journaling filesystems make guarantees on the filesystem meta-data, but >not on the data. Some like ext3, and reiserfs (with suse's journaling >patch) can journal the data, or order things so that the data is written >before any pointers (ie meta-data) make it to the disk so it will be harder >to loose data. >- >To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in >the body of a message to majordomo@vger.kernel.org >More majordomo info at http://vger.kernel.org/majordomo-info.html
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