[Gluster-users] 答复: lost data, help!

[renqiang]

        “I'm not sure if a truncate syscall will reset the data of the block which will be allocaed.. ”

       We use ext4 file system, dose it will reset the data of the block which will be allocated when it do a truncate syscall.


________________________________
发件人: Tao Lin [linbaiye at gmail.com]
发送时间: 2012年10月11日 11:04
收件人: renqiang
抄送: gluster-users at gluster.org
主题: Re: [Gluster-users] lost data, help!

I don't think glusterfs can help you out, and I guess that the "cp" command will do a trucate before copy data. While you were trying to copy files from bricks to mountpoint, it was obvious that you were trying to copy a file to itself, the cp command would truncate the file first, then "cp" found there was no data to copy, that was why data became to lose. Now this problem turn out to be a problem of low layer filesystem, and I'm not sure if a truncate syscall will reset the data of the block which will be allocaed.. Files that placed at new bricks must have contained valid data, so keep trying to use recover tools.

2012/10/10 renqiang <renqiang at 360buy.com<mailto:renqiang at 360buy.com>>

Hi,all:



       I have a problem now！Can you help me！

       When I use replace-brick command to use some new machines to replace some old machines in my cluster.
   But it dosen't susscess! It only create some link files in the new machines,it dosen't copy the real data to the

   new machines.So we have an idea，we copy the data in the bricks of  all the old machines to the volume of

   my cluster from the mount point of the volume.(There is only one volume in my cluster.) But we ingnor the

   link files in the bricks of the old methines.When we copy all the files in the bricks of the old methines to the
   volume , the link files overwrite  all the real data files which are linked by the link files. So we  lost much data.

  And when we read the files which are lost data, gluster will choose the file's real file in dead loop,So client

  time out and there are too many socket links.

        How can we find our data? We try to use some disk tools to recovery the lost data。 We analyse all
   copyed link files to find out which data wo lose.

        Can someone give me some suggestions,thank you!



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