Centos7 xfs configuration and centos7xfs Configuration

Centos7 xfs configuration and centos7xfs Configuration

XFS is a file system with high scalability and high performance. It is also the default file system of rhel7/centos7.
XFS supports metadata journaling, which enables faster recovery from crash.
It also supports fragment and resizing during mounting and activity.
Through latency allocation, XFS has won many opportunities to optimize write performance.
Xfsdump and xfsrestore tools can be used to back up and restore the xfs file system,
Xfsdump can be used at the dump level to complete Incremental backup, and files can be excluded through size, subtree, and inode flags.
User, group, and project quotas are also supported.

The following describes how to create an xfs file system, allocate quotas, and resize it:
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Partition/dev/sdb (2G) and enable LVM

[root@localhost zhongq]#parted /dev/sdb                               GNU Parted 3.1Using /dev/sdbWelcome to GNU Parted! Type 'help' to view a list of commands.(parted) mkpart primary 4 2048(parted) set 1 lvm on                                                    (parted) p                                                             Model: VMware, VMware Virtual S (scsi)Disk /dev/sdb: 2147MBSector size (logical/physical): 512B/512BPartition Table: gptDisk Flags: Number  Start   End     Size    File system  Name     Flags 1      4194kB  2048MB  2044MB               primary  lvm

 

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Create PV

[root@localhost zhongq]# pvcreate /dev/sdb1  Physical volume "/dev/sdb1" successfully created[root@localhost zhongq]# pvdisplay  --- Physical volume ---  PV Name               /dev/sda2  VG Name               centos  PV Size               24.51 GiB / not usable 3.00 MiB  Allocatable           yes (but full)  PE Size               4.00 MiB  Total PE              6274  Free PE               0  Allocated PE          6274  PV UUID               9hp8U7-IJM6-bwbP-G9Vn-IVuJ-yvE8-AkFjcB     "/dev/sdb1" is a new physical volume of "1.90 GiB"  --- NEW Physical volume ---  PV Name               /dev/sdb1  VG Name                 PV Size               1.90 GiB  Allocatable           NO  PE Size               0     Total PE              0  Free PE               0  Allocated PE          0  PV UUID               bu7yIH-1440-BPy1-APG2-FpvX-ejLS-2MIlA8

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Allocate/dev/sdb1 to the VG named xfsgroup00

[root@localhost zhongq]# vgcreate  xfsgroup00 /dev/sdb1 Volume group "xfsgroup00" successfully created[root@localhost zhongq]# vgdisplay --- Volume group ---  VG Name               centos  System ID               Format                lvm2  Metadata Areas        1  Metadata Sequence No  3  VG Access             read/write  VG Status             resizable  MAX LV                0  Cur LV                2  Open LV               2  Max PV                0  Cur PV                1  Act PV                1  VG Size               24.51 GiB  PE Size               4.00 MiB  Total PE              6274  Alloc PE / Size       6274 / 24.51 GiB  Free  PE / Size       0 / 0     VG UUID               T3Ryyg-R0rn-2i5r-7L5o-AZKG-yFkh-CDzhKm     --- Volume group ---  VG Name               xfsgroup00  System ID               Format                lvm2  Metadata Areas        1  Metadata Sequence No  1  VG Access             read/write  VG Status             resizable  MAX LV                0  Cur LV                0  Open LV               0  Max PV                0  Cur PV                1  Act PV                1  VG Size               1.90 GiB  PE Size               4.00 MiB  Total PE              487  Alloc PE / Size       0 / 0     Free  PE / Size       487 / 1.90 GiB  VG UUID               ejuwcc-sVES-MWWB-3Mup-n1wB-Kd0g-u7jm0H

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Run the lvcreate command to create an LV named xfsdata with a size of 1 gb in the xfsgroup00 group.

[root@localhost zhongq]# lvcreate -L 1024M -n xfsdata xfsgroup00WARNING: xfs signature detected on /dev/xfsgroup00/xfsdata at offset 0. Wipe it? [y/n] y  Wiping xfs signature on /dev/xfsgroup00/xfsdata.  Logical volume "xfsdata" created[root@localhost zhongq]# lvdisplay  --- Logical volume ---  LV Path                /dev/centos/swap  LV Name                swap  VG Name                centos  LV UUID                EnW3at-KlFG-XGaQ-DOoH-cGPP-8pSf-teSVbh  LV Write Access        read/write  LV Creation host, time localhost, 2014-08-18 20:15:25 +0800  LV Status              available  # open                 2  LV Size                2.03 GiB  Current LE             520  Segments               1  Allocation             inherit  Read ahead sectors     auto  - currently set to     8192  Block device           253:0     --- Logical volume ---  LV Path                /dev/centos/root  LV Name                root  VG Name                centos  LV UUID                zmZGkv-Ln4W-B8AY-oDnD-BEk2-6VWL-L0cZOv  LV Write Access        read/write  LV Creation host, time localhost, 2014-08-18 20:15:26 +0800  LV Status              available  # open                 1  LV Size                22.48 GiB  Current LE             5754  Segments               1  Allocation             inherit  Read ahead sectors     auto  - currently set to     8192  Block device           253:1     --- Logical volume ---  LV Path                /dev/xfsgroup00/xfsdata  LV Name                xfsdata  VG Name                xfsgroup00  LV UUID                O4yvoY-XGcD-0zPm-eilR-3JJP-updU-rRCSlJ  LV Write Access        read/write  LV Creation host, time localhost.localdomain, 2014-09-23 15:50:19 +0800  LV Status              available  # open                 0  LV Size                1.00 GiB  Current LE             256  Segments               1  Allocation             inherit  Read ahead sectors     auto  - currently set to     8192  Block device           253:3

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Format the partition as an xfs file system.
Note: After xfs is created, its size cannot be reduced, but it can be increased through xfs_growfs.

[root@localhost zhongq]# mkfs.xfs /dev/xfsgroup00/xfsdata meta-data=/dev/xfsgroup00/xfsdata isize=256    agcount=4, agsize=65536 blks         =                       sectsz=512   attr=2, projid32bit=1         =                       crc=0data     =                       bsize=4096   blocks=262144, imaxpct=25         =                       sunit=0      swidth=0 blksnaming   =version 2              bsize=4096   ascii-ci=0 ftype=0log      =internal log           bsize=4096   blocks=2560, version=2         =                       sectsz=512   sunit=0 blks, lazy-count=1realtime =none                   extsz=4096   blocks=0, rtextents=0

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Mount the xfs system partition to the specified directory, and enable the file system quota through the uquota parameter.

[root@localhost zhongq]# mkdir /xfsdata[root@localhost zhongq]# mount -o uquota,gquota /dev/xfsgroup00/xfsdata /xfsdata[root@localhost zhongq]# chmod 777 /xfsdata[root@localhost zhongq]# mount|grep xfsdata/dev/mapper/xfsgroup00-xfsdata on /xfsdata type xfs (rw,relatime,attr2,inode64,usrquota,grpquota)

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Run the xfs_quota command to view the quota information, allocate quotas to users and directories, and verify whether the quota limit is effective.

[root@localhost zhongq]# xfs_quota -x -c 'report' /xfsdataUser quota on /xfsdata (/dev/mapper/xfsgroup00-xfsdata)                               Blocks                     User ID          Used       Soft       Hard    Warn/Grace     ---------- -------------------------------------------------- root                0          0          0     00 [--------]Group quota on /xfsdata (/dev/mapper/xfsgroup00-xfsdata)                               Blocks                     Group ID         Used       Soft       Hard    Warn/Grace     ---------- -------------------------------------------------- root                0          0          0     00 [--------][root@localhost zhongq]# xfs_quota -x -c 'limit bsoft=100M bhard=120M zhongq' /xfsdata[root@localhost zhongq]#xfs_quota -x -c 'report' /xfsdataUser quota on /xfsdata (/dev/mapper/xfsgroup00-xfsdata)                               Blocks                     User ID          Used       Soft       Hard    Warn/Grace     ---------- -------------------------------------------------- root                0          0          0     00 [--------]zhongq              0     102400     122880     00 [--------]Group quota on /xfsdata (/dev/mapper/xfsgroup00-xfsdata)                               Blocks                     Group ID         Used       Soft       Hard    Warn/Grace     ---------- -------------------------------------------------- root                0          0          0     00 [--------][root@localhost zhongq]# su zhongq[zhongq@localhost ~]$ dd if=/dev/zero of=/xfsdata/zq00 bs=1M count=100100+0 records in100+0 records out104857600 bytes (105 MB) copied, 28.9833 s, 3.6 MB/s[zhongq@localhost ~]$ dd if=/dev/zero of=/xfsdata/zq01 bs=1M count=100dd: error writing ‘/xfsdata/zq01’: Disk quota exceeded21+0 records in20+0 records out20971520 bytes (21 MB) copied, 4.18921 s, 5.0 MB/s[zhongq@localhost ~]$ exit[root@localhost zhongq]# xfs_quota xfs_quota> helpdf [-bir] [-hn] [-f file] -- show free and used counts for blocks and inodeshelp [command] -- help for one or all commandsprint -- list known mount points and projectsquit -- exit the programquota [-bir] [-gpu] [-hnNv] [-f file] [id|name]... -- show usage and limitsUse 'help commandname' for extended help.xfs_quota> printFilesystem          Pathname/                   /dev/mapper/centos-root/boot               /dev/sda1/var/lib/docker     /dev/mapper/centos-root/xfsdata            /dev/mapper/xfsgroup00-xfsdata (uquota, gquota)xfs_quota> quota -u zhongqDisk quotas for User zhongq (1000)Filesystem                        Blocks      Quota      Limit  Warn/Time      Mounted on/dev/mapper/xfsgroup00-xfsdata    122880     102400     122880   00  [6 days]   /xfsdata

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Use the command lvextend to scale the LV to 1.5 GB (the initial capacity is 1 GB), and then use the command xfs_growfs to scale up the xfs File System (here the block count is used)

[root@localhost zhongq]# lvextend -L 1.5G /dev/xfsgroup00/xfsdata   Extending logical volume xfsdata to 1.50 GiB  Logical volume xfsdata successfully resized  [root@localhost zhongq]# xfs_growfs /dev/xfsgroup00/xfsdata -D 393216meta-data=/dev/mapper/xfsgroup00-xfsdata isize=256    agcount=4, agsize=65536 blks         =                       sectsz=512   attr=2, projid32bit=1         =                       crc=0data     =                       bsize=4096   blocks=262144, imaxpct=25         =                       sunit=0      swidth=0 blksnaming   =version 2              bsize=4096   ascii-ci=0 ftype=0log      =internal               bsize=4096   blocks=2560, version=2         =                       sectsz=512   sunit=0 blks, lazy-count=1realtime =none                   extsz=4096   blocks=0, rtextents=0data blocks changed from 262144 to 393216  [root@localhost zhongq]# df -h|grep xfsdata/dev/mapper/xfsgroup00-xfsdata  1.5G  153M  1.4G  10% /xfsdata

What is the xfs format in centos7?

Like ext3 ext4, It is a file system, but it is called massive storage.
Performance Comparison see also
Www.cnblogs.com/...7.html
 
For XFS File System Problems in LINUX

Run the following command to check whether the kernel supports the XFS file system?
Grep "CONFIG_XFS_FS"/boot/config -*

What is the output of the above command? My computer is shown as follows:
[Root @ localhost ~] # Grep "CONFIG_XFS_FS"/boot/config -*
/Boot/config-2.6.18-348.1.1.el5: CONFIG_XFS_FS = m
/Boot/config-2.6.18-348.el5: CONFIG_XFS_FS = m