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1. op-journaled fs, journal size and storage speeds (score: 1): Author: pg_xf2@xxxxxxxxxxxxxxxxx (Peter Grandi); Date: Sat, 30 Apr 2011 15:51:43 +0100; Been thinking about journals and RAID6s and SSDs. In particular for file system designs like JFS and XFS that do operation journaling (while ext[34] do block journaling). The issue is: journal size?; /archives/xfs/2011-04/msg00423.html (8,466 bytes)
2. Re: op-journaled fs, journal size and storage speeds (score: 1): Author: Dave Chinner <david@xxxxxxxxxxxxx>; Date: Sun, 1 May 2011 19:27:58 +1000; XFS is not an operation journalling filesystem. Most of the metadata is dirty-region logged via buffers, just like ext3/4. Perhaps you need to read some documentation like this: http://xfs.org/index.; /archives/xfs/2011-05/msg00005.html (12,217 bytes)
3. Re: op-journaled fs, journal size and storage speeds (score: 1): Author: pg_mh@xxxxxxxxxx (Peter Grandi); Date: Sun, 1 May 2011 19:13:03 +0100; Looking at the sources, XFS does operations journaling, in the form of physical ("dirty region") operation logging, instead of logical operation logging like JFS. Both are very different from block; /archives/xfs/2011-05/msg00016.html (15,841 bytes)
4. Re: op-journaled fs, journal size and storage speeds (score: 1): Author: Dave Chinner <david@xxxxxxxxxxxxx>; Date: Mon, 2 May 2011 11:23:06 +1000; Operation logging contains no physical changes - it just indicates the change to be made typically via an intent/done transaction pair. It says what is going to be done, then what has been done, but; /archives/xfs/2011-05/msg00019.html (20,222 bytes)
5. Re: op-journaled fs, journal size and storage speeds (score: 1): Author: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>; Date: Sun, 01 May 2011 23:35:30 -0500; Got a supplier for the custom hardware you'd need? Just use a PCIe SSD.... 50GB OCZ RevoDrive PCIe x4 SSD MLC NAND Dual SandForce 1200 controllers, internal RAID 0 design 70,000 write IOPS, 4KB alig; /archives/xfs/2011-05/msg00021.html (8,664 bytes)
6. Re: op-journaled fs, journal size and storage speeds (score: 1): Author: Christoph Hellwig <hch@xxxxxxxxxxxxx>; Date: Mon, 2 May 2011 06:40:31 -0400; Using a writeback cache on the log device is rather pointless as every writes needs write through semantics using FUA or a post-flush anyway. But I actually have patch to allow for devices with a wri; /archives/xfs/2011-05/msg00029.html (10,503 bytes)

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