Yes, I had seen the issue of extended attributes and that doesn't
worry me that much. It won't be much information for the last copy
of data.
I guess my query comes down to how safe it is to mount the raw lustre
partition ro while it is still being served... and then to copy data
off it. I appreciate there will be a performance penalty.
Stu.
On 06/06/2007, at 4:52 PM, Stephen Willey wrote:
I inquired about this a while back and got the following:
"In order to minimize downtime, it would also be possible to use
the ext2
"dump" program in order to do device-level backups (including the
extended attributes) while the filesystem is in use. This backup
would
not be 100% coherent with the actual filesystem.
The problem with running rsync to do the final sync step is that this
has no understanding of extended attributes. For current (1.4.8)
versions of Lustre the OST EAs are not required for the correct
operation of the filesystem (they are redundant information to assist
recovery in case of corruption), but in the future that may not be
true."
The (offline) method of migrating an OST is here: https://
bugzilla.clusterfs.com/show_bug.cgi?id=4633 but after reading the
above I guess you should probably run the getfattr/setfattr
commands on the OSTs as well as the MDT.
Stephen
--
Dr Stuart Midgley
[EMAIL PROTECTED]
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