By the way, the documentation is excellent, for a developer who wants to work on the codebase. It describes the data structures and layouts etc.. better than perhaps any other Linux filesystem. But i
david@xxxxxxx put forth on 1/27/2011 2:11 PM: how do I understand how to setup things on multi-disk systems? the documentation I've found online is not that helpful, and in some ways contradictory.
As suggested before - why are you messing with AGs instead of allocsize? I suspect that with the default configuration, XFS was trying to maximize throughput by reducing seeks with multiple processes
A simple google search turns up discussions like this: http://oss.sgi.com/archives/xfs/2009-01/msg01161.html Where someone reads the docco and asks questions to fill in gaps in their knowledge that t
Only depending on block device capacity. Once at the maximum AG size (1TB), mkfs has to add more AGs. So once above 4TB for hardware RAID LUNs and 16TB for md/dm devices, you will get an AG per TB of
"in the long term we still expect fragmentation to degrade the performance of XFS file systems" Other than that, no hints there about how changing agcount affects things. Well, I've got 2/3 of those
Am Thursday 27 January 2011 schrieb Stan Hoeppner: With one addition: Use a recent xfsprogs! ;) Earlier ones created more AGs, didn't activate lazy super block counter (likely no issue here) and what
Picking the perfect mkfs.xfs parameters for a hardware RAID array can be somewhat of a black art, mainly because no two vendor arrays act or perform identically. if mkfs.xfs can figure out how to do
"so we intend to add an on-line file system defragmentation utility to optimize the file system in the future" You are quoting from the wrong link - that's from the 1996 whitepaper. And sure, at the
I'm going to be blunt - XFS is not a filesystem suited to use by clueless noobs. XFS is a highly complex filesystem designed for high end, high performance storage and therefore has the configurabili
Picking the perfect mkfs.xfs parameters for a hardware RAID array can be somewhat of a black art, mainly because no two vendor arrays act or perform identically. if mkfs.xfs can figure out how to do
Just because we can't do it right now doesn't mean it is not possible. Array/raid controller vendors need to implement the SCSI block limit VPD page, and if they do then stripe unit/stripe width may