Oops... forgot to add. You can also avoid this by mounting the
volume with data=writeback. It is this default ordered journaling
mode (data=ordered) that is eventually forcing this data flush.
Sunil Mushran wrote:
stat-ing a file makes the fs acquire a readlock (PR) forcing the other
node
to downgrade from writelock (EX) which then forces it to flush the
dirty pages
to disk. Say you have 500M to flush and your iscsi setup's io thruput
is 30MB/s.
That'll be 16 secs.
Note: The nodes are not frozen. The ls and cp processes are waiting on
the
pages to flush to disk.
You can confirm this by repeating the test and doing a "find ."
instead of ls.
The former will not stat the file (will only stat the directory) and
thus avoid
the force flush seen above.
Yuri Kirsanov wrote:
Good day, everyone.
I have SAN server build with Openfiler OS, with iSCSI mode turned on.
I have two nodes, which connect to that server via iSCSI, using one
of two active iSCSI partitions. I've installed ocfs2 1.3.3 with
kernel 2.6.23.1, configured it, made ocfs2 partition and was
successful in mounting it on both nodes. Everything works just fine,
I can upload file from one node and delete it using another one,
except for one strange thing. When I'm using ocfs2 mounted partition
from one node, for example, uploading 1Gb test file into it, and I
try to access that partition from another node - just to read
directory, for example, - both nodes "freeze" for about 15-20
seconds, both operations just stops for a while, and then copying
continues on first node, while second one gets directory listing.
I have no errors on both nodes, neither iSCSI ones, no ocfs2. All
three servers are joined together using 1Gbit/sec network switch and
there's no other machines on that switch.
If you need any information, please feel free to ask me about it.
Thanks in advance!
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