Re: Data loss after force umount !

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2013-10-8 上午9:00于 "higkoohk" <higkoohk@xxxxxxxxx>写道:
>
> Thanks everyone, the env like this :
>
> Linux 3.0.97-1.el6.elrepo.x86_64 CentOS 6.4
>
> ceph version 0.61.7 (8f010aff684e820ecc837c25ac77c7a05d7191ff)
>
> /dev/sdd1 on /var/lib/ceph/osd/ceph-2 type xfs (rw)
> /dev/sdb1 on /var/lib/ceph/osd/ceph-3 type xfs (rw)
> /dev/sdc1 on /var/lib/ceph/osd/ceph-4 type xfs (rw)
>
> meta-data=/dev/sdb1              isize=2048   agcount=4, agsize=8895321
blks
>          =                       sectsz=512   attr=2, projid32bit=0
> data     =                       bsize=4096   blocks=35581281, imaxpct=25
>          =                       sunit=0      swidth=0 blks
> naming   =version 2              bsize=4096   ascii-ci=0
> log      =internal               bsize=4096   blocks=17373, version=2
>          =                       sectsz=512   sunit=0 blks, lazy-count=1
> realtime =none                   extsz=4096   blocks=0, rtextents=0
>
> /usr/libexec/qemu-kvm -name centos6-clone2 -S -machine
rhel6.4.0,accel=kvm -m 1000 -smp 2,sockets=2,cores=1,threads=1 -uuid
dd1a7093-bdea-4816-8a62-df61cb0c9bfa -nodefconfig -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/centos6-clone2.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
file=rbd:rbd/centos6-clone2:auth_supported=none:mon_host=agent21.kisops.org\:6789,if=none,id=drive-virtio-disk0
-device
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-netdev tap,fd=22,id=hostnet0,vhost=on,vhostfd=23 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:5c:71:f1,bus=pci.0,addr=0x3
-vnc 0.0.0.0:0 -vga cirrus -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
>
> Use `umount -l` to force umount.

`umount -l` is not force umount, it just detach the fs from the hierarchy.
The fs is mounted internelly in the kernel if there still are references.
I'm not surprise the fs errors If you use `umount -l` to umount the rbd in
one guest, then mount the  rbd in another guest.

Yan, zheng
>
> Anything else ?
>
>
> 2013/10/8 Mark Nelson <mark.nelson@xxxxxxxxxxx>
>>
>> Also, mkfs, mount, and kvm disk options?
>>
>> Mark
>>
>>
>> On 10/07/2013 03:15 PM, Samuel Just wrote:
>>>
>>> Sounds like it's probably an issue with the fs on the rbd disk?  What
>>> fs was the vm using on the rbd?
>>> -Sam
>>>
>>> On Mon, Oct 7, 2013 at 8:11 AM, higkoohk <higkoohk@xxxxxxxxx> wrote:
>>>>
>>>> We use ceph as the storage of kvm .
>>>>
>>>> I found the VMs errors when force umount the ceph disk.
>>>>
>>>> Is it just right ? How to repair it ?
>>>>
>>>> Many thanks .
>>>>
>>>> --higkoo
>
>
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