>> Has anyone tuned XFS with its several mount options? some useful info below, which I didn't know (logbsize & delaylog). I suspect it would increase backuppc performance.
http://xfs.org/index.php/XFS_FAQ: > Q: I want to tune my XFS filesystems for <something> > > The standard answer you will get to this question is this: use the defaults. > > There are few workloads where using non-default mkfs.xfs or mount > options make much sense. In general, the default values already > used are optimised for best performance in the first place. mkfs.xfs > will detect the difference between single disk and MD/DM RAID setups > and change the default values it uses to configure the filesystem > appropriately. > > There are a lot of "XFS tuning guides" that Google will find for > you - most are old, out of date and full of misleading or just plain > incorrect information. Don't expect that tuning your filesystem for > optimal bonnie++ numbers will mean your workload will go faster. > You should only consider changing the defaults if either: a) you > know from experience that your workload causes XFS a specific problem > that can be worked around via a configuration change, or b) your > workload is demonstrating bad performance when using the default > configurations. In this case, you need to understand why your > application is causing bad performance before you start tweaking > XFS configurations. > > In most cases, the only thing you need to to consider for mkfs.xfs > is specifying the stripe unit and width for hardware RAID devices. > For mount options, the only thing that will change metadata performance > considerably are the logbsize and delaylog mount options. Increasing > logbsize reduces the number of journal IOs for a given workload, > and delaylog will reduce them even further. The trade off for this > increase in metadata performance is that more operations may be > "missing" after recovery if the system crashes while actively making > modifications. One other thing that I found while poking around is references to "lazy counters." This is a newer feature of XFS and should increase performance from what i can tell. If you make a filesystem with the current version of XFS tools it will be on by default. Make sure that your system is using the current version - see the mkfs.xfs man page for more. If you have an existing XFS filesystem it probably isn't on, but it appears you may be able to change that with xfs_util. I would make sure I had a backup of the filesystem before dorking with xfs_util. hope this helps danno -- Dan Pritts, Sr. Systems Engineer Internet2 office: +1-734-352-4953 | mobile: +1-734-834-7224 ------------------------------------------------------------------------------ vRanger cuts backup time in half-while increasing security. With the market-leading solution for virtual backup and recovery, you get blazing-fast, flexible, and affordable data protection. Download your free trial now. http://p.sf.net/sfu/quest-d2dcopy1 _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/