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[linux-lvm] LVM2 [lvcreate --type raid5] issue



Hi

 

New to Linux, not sure if this is a legitimate fault, or if I am doing something wrong. Please can you advise on which release of LVM2 (if any) fixes this issue.

 

Initially tested using SL6.4, now testing with SL6.5. I have used both LiveDVD and basic “Minimal Desktop” Installations on the target computer and inside a VirtualBox Virtual Machine.

 

I am preparing to install SL6.5 on a small system with 3x750GB Disks. As a pre-requisite, I wish to testing the performance of the disks using different chunk/block sizes using LVM2 RAID5.

 

It is a preference to use LVM2 RAID5 rather than mdraid and LVM2 to reduce the complexity of setting up and managing the system.

 

However I am experiencing a problem when creating the Logical Volume. This issue occurs with both SL6.4 and SL6.5:

 

  /dev/vg_system1/lv_system1: read failed after 0 of 4096 at 0: Input/output error

  /dev/vg_system1/lv_system1: write failed after 0 of 4096 at 0: Input/output error

 

There was one additional issue with SL6.4 which also appears to be partially resolved in SL6.5. Certain commands function without an issue, however once the issue manifests, it appears in most or all commands:

 

[root localhost ~]# pvscan -vd

    Wiping cache of LVM-capable devices

    Wiping internal VG cache

    Walking through all physical volumes

  /dev/vg_system1/lv_system1: read failed after 0 of 4096 at 5368643584: Input/output error

  /dev/vg_system1/lv_system1: read failed after 0 of 4096 at 5368700928: Input/output error

  /dev/vg_system1/lv_system1: read failed after 0 of 4096 at 0: Input/output error

  /dev/vg_system1/lv_system1: read failed after 0 of 4096 at 4096: Input/output error

    /dev/vg_system1/lv_system1: read failed after 0 of 4096 at 0: Input/output error

  PV /dev/sdb1   VG vg_system1   lvm2 [16.00 GiB / 13.50 GiB free]

  PV /dev/sdc1   VG vg_system1   lvm2 [16.00 GiB / 13.50 GiB free]

  PV /dev/sdd1   VG vg_system1   lvm2 [16.00 GiB / 13.50 GiB free]

  PV /dev/sda2   VG VolGroup     lvm2 [11.51 GiB / 0    free]

  Total: 4 [59.50 GiB] / in use: 4 [59.50 GiB] / in no VG: 0 [0   ]

 

I am at a loss to explain this, I cannot find any information relating to these errors.

 

If I cannot resolve this within a reasonable period of time, I will be forced to use mdraid which is much less flexible – i.e. if I wish to use different RAID modes, I have to use separate partitions/volume groups for example I would consider using unraided partitions for /boot, RAID 0 for SWAP and /tmp and RAID 5 for the rest of the system. Separating these into different partitions means the system will have to span further across the disk at times.

 

I am considering possibly testing a later revision of LVM2 as I understand that SL6.5 has LVM2-2.02.100-8 while subversions 101 – 105 are available. I understand that to do this I may have to download the source code of this and dependant packages and compile it. This is not something I can easily do, but am prepared to try if I can get some guidance.

 

It may be useful to test this in RHEL 6.5 and CentOS 6.5 though I could only do this on the latter myself.

 

Below are the scripts to destroy the test LV/VG/PV and a test pass, and a script to create the PV/VG/LV as executed on a test system. Each attempt I execute the destroy script prior to running the create script. There is also a dump of the partition tables.

 

I hope you can point me in the right direction!

 

Thanks and Regards,

 

J Woolliscroft

[root localhost ~]# cat d_lv

lvremove /dev/vg_system1/lv_system1

vgremove vg_system1

pvremove /dev/sdb1 /dev/sdc1 /dev/sdd1

=====

[root localhost ~]# . ./d_lv

Do you really want to remove active logical volume lv_system1? [y/n]: y

  Logical volume "lv_system1" successfully removed

  Volume group "vg_system1" successfully removed

  Labels on physical volume "/dev/sdb1" successfully wiped

  Labels on physical volume "/dev/sdc1" successfully wiped

  Labels on physical volume "/dev/sdd1" successfully wipeda

 

[root localhost ~]# cat c_lv

parted -l

 

pvcreate -M2 -v /dev/sdb1 /dev/sdc1 /dev/sdd1

 

pvs -v -d

pvscan -v -d

 

vgcreate -s 4kib -v vg_system1 /dev/sdb1 /dev/sdc1 /dev/sdd1

 

vgs -v -d

vgscan -v -d

 

lvcreate --type raid5 -i 2 -I 4 -L 5G -ay -Zy -v -n lv_system1 vg_system1

 

lvs -v -d

lvscan -v -d

[root localhost ~]# . ./c_lv

Model: ATA VBOX HARDDISK (scsi)

Disk /dev/sda: 12.9GB

Sector size (logical/physical): 512B/512B

Partition Table: msdos

 

Number  Start   End     Size    Type     File system  Flags

1      1049kB  525MB   524MB   primary  ext4         boot

2      525MB   12.9GB  12.4GB  primary               lvm

 

 

Model: ATA VBOX HARDDISK (scsi)

Disk /dev/sdb: 17.2GB

Sector size (logical/physical): 512B/512B

Partition Table: gpt

 

Number  Start   End     Size    File system  Name     Flags

1      1049kB  17.2GB  17.2GB               primary  lvm

 

 

Model: ATA VBOX HARDDISK (scsi)

Disk /dev/sdc: 17.2GB

Sector size (logical/physical): 512B/512B

Partition Table: gpt

 

Number  Start   End     Size    File system  Name     Flags

1      1049kB  17.2GB  17.2GB               primary  lvm

 

 

Model: ATA VBOX HARDDISK (scsi)

Disk /dev/sdd: 17.2GB

Sector size (logical/physical): 512B/512B

Partition Table: gpt

 

Number  Start   End     Size    File system  Name     Flags

1      1049kB  17.2GB  17.2GB               primary  lvm

 

 

Model: Linux device-mapper (linear) (dm)

Disk /dev/mapper/VolGroup-lv_swap: 2147MB

Sector size (logical/physical): 512B/512B

Partition Table: loop

 

Number  Start  End     Size    File system     Flags

1      0.00B  2147MB  2147MB  linux-swap(v1)

 

 

Model: Linux device-mapper (linear) (dm)

Disk /dev/mapper/VolGroup-lv_root: 10.2GB

Sector size (logical/physical): 512B/512B

Partition Table: loop

 

Number  Start  End     Size    File system  Flags

1      0.00B  10.2GB  10.2GB  ext4

 

 

    Set up physical volume for "/dev/sdb1" with 33552351 available sectors

    Zeroing start of device /dev/sdb1

    Writing physical volume data to disk "/dev/sdb1"

  Physical volume "/dev/sdb1" successfully created

    Set up physical volume for "/dev/sdc1" with 33552351 available sectors

    Zeroing start of device /dev/sdc1

    Writing physical volume data to disk "/dev/sdc1"

  Physical volume "/dev/sdc1" successfully created

    Set up physical volume for "/dev/sdd1" with 33552351 available sectors

    Zeroing start of device /dev/sdd1

    Writing physical volume data to disk "/dev/sdd1"

  Physical volume "/dev/sdd1" successfully created

    Scanning for physical volume names

    Wiping cache of LVM-capable devices

  PV         VG       Fmt  Attr PSize  PFree  DevSize PV UUID                              

  /dev/sda2  VolGroup lvm2 a--  11.51g     0   11.51g JjV0kz-rW98-zTxe-X1jm-T9h3-i6SG-Frd325

  /dev/sdb1           lvm2 a--  16.00g 16.00g  16.00g k7kxWU-W1bh-Eqda-xVj8-aBva-efN4-Et5B94

  /dev/sdc1           lvm2 a--  16.00g 16.00g  16.00g 9M29V5-qldE-mSVl-Z2UY-h9nM-1F3i-AEsNYu

  /dev/sdd1           lvm2 a--  16.00g 16.00g  16.00g zPpXzZ-ptwp-qxok-ubNq-asmz-Ifcj-QtRvfv

    Wiping cache of LVM-capable devices

    Wiping internal VG cache

    Walking through all physical volumes

  PV /dev/sda2   VG VolGroup        lvm2 [11.51 GiB / 0    free]

  PV /dev/sdb1                      lvm2 [16.00 GiB]

  PV /dev/sdc1                      lvm2 [16.00 GiB]

  PV /dev/sdd1                      lvm2 [16.00 GiB]

  Total: 4 [59.50 GiB] / in use: 1 [11.51 GiB] / in no VG: 3 [48.00 GiB]

    Wiping cache of LVM-capable devices

    Wiping cache of LVM-capable devices

    Adding physical volume '/dev/sdb1' to volume group 'vg_system1'

    Adding physical volume '/dev/sdc1' to volume group 'vg_system1'

    Adding physical volume '/dev/sdd1' to volume group 'vg_system1'

    Archiving volume group "vg_system1" metadata (seqno 0).

    Creating volume group backup "/etc/lvm/backup/vg_system1" (seqno 1).

  Volume group "vg_system1" successfully created

    Finding all volume groups

    Finding volume group "vg_system1"

    Finding volume group "VolGroup"

  VG         Attr   Ext   #PV #LV #SN VSize  VFree  VG UUID                                VProfile

  VolGroup   wz--n- 4.00m   1   2   0 11.51g     0  oaJmPd-ElY9-a0E9-hUlu-SLxE-XTje-LfpO31        

  vg_system1 wz--n- 4.00k   3   0   0 47.99g 47.99g hZTC0w-k0bJ-6M2A-Fmky-hHLo-hzHM-k8gdPl        

    Wiping cache of LVM-capable devices

    Wiping internal VG cache

  Reading all physical volumes.  This may take a while...

    Finding all volume groups

    Finding volume group "vg_system1"

  Found volume group "vg_system1" using metadata type lvm2

    Finding volume group "VolGroup"

  Found volume group "VolGroup" using metadata type lvm2

    Setting logging type to disk

    Finding volume group "vg_system1"

    Archiving volume group "vg_system1" metadata (seqno 1).

    Creating logical volume lv_system1

    Creating logical volume lv_system1_rimage_0

    Creating logical volume lv_system1_rmeta_0

    Creating logical volume lv_system1_rimage_1

    Creating logical volume lv_system1_rmeta_1

    Creating logical volume lv_system1_rimage_2

    Creating logical volume lv_system1_rmeta_2

    activation/volume_list configuration setting not defined: Checking only host tags for vg_system1/lv_system1_rmeta_0

    Creating vg_system1-lv_system1_rmeta_0

    Loading vg_system1-lv_system1_rmeta_0 table (253:2)

    Resuming vg_system1-lv_system1_rmeta_0 (253:2)

    Clearing metadata area of vg_system1/lv_system1_rmeta_0

    Clearing start of logical volume "lv_system1_rmeta_0"

    Removing vg_system1-lv_system1_rmeta_0 (253:2)

    activation/volume_list configuration setting not defined: Checking only host tags for vg_system1/lv_system1_rmeta_1

    Creating vg_system1-lv_system1_rmeta_1

    Loading vg_system1-lv_system1_rmeta_1 table (253:2)

    Resuming vg_system1-lv_system1_rmeta_1 (253:2)

    Clearing metadata area of vg_system1/lv_system1_rmeta_1

    Clearing start of logical volume "lv_system1_rmeta_1"

    Removing vg_system1-lv_system1_rmeta_1 (253:2)

    activation/volume_list configuration setting not defined: Checking only host tags for vg_system1/lv_system1_rmeta_2

    Creating vg_system1-lv_system1_rmeta_2

    Loading vg_system1-lv_system1_rmeta_2 table (253:2)

    Resuming vg_system1-lv_system1_rmeta_2 (253:2)

    Clearing metadata area of vg_system1/lv_system1_rmeta_2

    Clearing start of logical volume "lv_system1_rmeta_2"

    Removing vg_system1-lv_system1_rmeta_2 (253:2)

    Creating volume group backup "/etc/lvm/backup/vg_system1" (seqno 3).

    activation/volume_list configuration setting not defined: Checking only host tags for vg_system1/lv_system1

    Creating vg_system1-lv_system1_rmeta_0

    Loading vg_system1-lv_system1_rmeta_0 table (253:2)

    Resuming vg_system1-lv_system1_rmeta_0 (253:2)

    Creating vg_system1-lv_system1_rimage_0

    Loading vg_system1-lv_system1_rimage_0 table (253:3)

    Resuming vg_system1-lv_system1_rimage_0 (253:3)

    Creating vg_system1-lv_system1_rmeta_1

    Loading vg_system1-lv_system1_rmeta_1 table (253:4)

    Resuming vg_system1-lv_system1_rmeta_1 (253:4)

    Creating vg_system1-lv_system1_rimage_1

    Loading vg_system1-lv_system1_rimage_1 table (253:5)

    Resuming vg_system1-lv_system1_rimage_1 (253:5)

    Creating vg_system1-lv_system1_rmeta_2

    Loading vg_system1-lv_system1_rmeta_2 table (253:6)

    Resuming vg_system1-lv_system1_rmeta_2 (253:6)

    Creating vg_system1-lv_system1_rimage_2

    Loading vg_system1-lv_system1_rimage_2 table (253:7)

    Resuming vg_system1-lv_system1_rimage_2 (253:7)

    Creating vg_system1-lv_system1

    Loading vg_system1-lv_system1 table (253:8)

    Resuming vg_system1-lv_system1 (253:8)

    Monitoring vg_system1/lv_system1

    Clearing start of logical volume "lv_system1"

  /dev/vg_system1/lv_system1: read failed after 0 of 4096 at 0: Input/output error

  /dev/vg_system1/lv_system1: write failed after 0 of 4096 at 0: Input/output error

    Creating volume group backup "/etc/lvm/backup/vg_system1" (seqno 3).

  Logical volume "lv_system1" created

    Finding all logical volumes

  LV         VG         #Seg Attr       LSize Maj Min KMaj KMin Pool Origin Data%  Meta%  Move Cpy%Sync Log Convert LV UUID                                LProfile

  lv_root    VolGroup      1 -wi-ao---- 9.51g  -1  -1 253  0                                                        BG77rR-C2lS-UXzm-V4KI-ptcG-1BZu-0yqVcV        

  lv_swap    VolGroup      1 -wi-ao---- 2.00g  -1  -1 253  1                                                        i6uo0r-9T2P-OW60-Z1i7-6o7y-id1Q-1R7Lli        

  lv_system1 vg_system1    1 rwi-a-r-r- 5.00g  -1  -1 253  8                                     100.00             GM0hKc-BHNV-CUAR-y0US-5Iw9-Ihi0-GSFD1V        

    Finding all logical volumes

  ACTIVE            '/dev/vg_system1/lv_system1' [5.00 GiB] inherit

  ACTIVE            '/dev/VolGroup/lv_root' [9.51 GiB] inherit

  ACTIVE            '/dev/VolGroup/lv_swap' [2.00 GiB] inherit

[root localhost ~]#

 

 

 

 


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