“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 [[email protected]]
发送时间: 2012年10月11日 11:04
收件人: renqiang
抄送: [email protected]
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 <[email protected]<mailto:[email protected]>>
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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