Greetings, I’m in the process of tracking down lower than expected performance and occasional blocked tasks on some internal file servers with XFS datastores. Several sources have pointed out the importance of using the correct stripe unit and stripe size when formatting and mounting XFS filesystems, and that XFS can detect these values for some, but not all, hardware RAID controllers. The servers in question are PowerEdge R510b servers with PERC H700 controllers. Datastores are RAID5 with a 128K stripe. Is there any way to determine if the stripe unit and stripe size were detected correctly? These values were not specified when the filesystems were formatted or mounted. If they were not detected, is there any way to determine them programmatically? If this is not the correct forum for this question please point me in the right direction. Best regards, John Simpson Format command: mkfs.xfs /dev/sdb1 Fstab entry: /dev/sdb1 /DS01 xfs defaults,logbufs=8 1 2 # uname -a Linux reyqa-ribs001 2.6.32-573.12.1.el6.x86_64 #1 SMP Tue Dec 15 21:19:08 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux # cat /etc/redhat-release CentOS release 6.7 (Final) # rpm -qi xfsprogs Name : xfsprogs Relocations: (not relocatable) Version : 3.1.1 Vendor: CentOS Release : 16.el6 Build Date: Wed 15 Oct 2014 10:16:05 AM EDT Install Date: Wed 25 Feb 2015 11:46:11 AM EST Build Host: c6b8.bsys.dev.centos.org Group : System Environment/Base Source RPM: xfsprogs-3.1.1-16.el6.src.rpm Size : 3325667 License: GPL+ and LGPLv2+ Signature : RSA/SHA1, Fri 17 Oct 2014 04:00:19 PM EDT, Key ID 0946fca2c105b9de Packager : CentOS BuildSystem <http://bugs.centos.org> URL : http://oss.sgi.com/projects/xfs/ Summary : Utilities for managing the XFS filesystem Description : A set of commands to use the XFS filesystem, including mkfs.xfs. XFS is a high performance journaling filesystem which originated on the SGI IRIX platform. It is completely multi-threaded, can support large files and large filesystems, extended attributes, variable block sizes, is extent based, and makes extensive use of Btrees (directories, extents, free space) to aid both performance and scalability. Refer to the documentation at http://oss.sgi.com/projects/xfs/ for complete details. This implementation is on-disk compatible with the IRIX version of XFS. # xfs_info /DS01 meta-data="" isize=256 agcount=5, agsize=268435455 blks = sectsz=512 attr=2, projid32bit=0 data = bsize=4096 blocks=1212415488, imaxpct=5 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal bsize=4096 blocks=521728, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 John Simpson |
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