[lustre-discuss] client server communication half-lost, read-out?

Alexander I Kulyavtsev aik at fnal.gov
Mon Aug 1 13:37:05 PDT 2016

I used this:

# lctl get_param printk

lnet.printk=warning error emerg console

# lctl set_param printk=+neterror


# lctl set_param printk=-neterror

Take a look at  "Diagnostic and Debugging Tools" chapter at lustre manual.

# lctl debug_list subs
Subsystems: all_subs, undefined, mdc, mds, osc, ost, class, log, llite, rpc, mgmt, lnet, lnd, pinger, filter, echo, ldlm, lov, lquota, osd, lfsck, lmv, sec, gss, mgc, mgs, fid, fld

# lctl debug_list types
Types: all_types, trace, inode, super, ext2, malloc, cache, info, ioctl, neterror, net, warning, buffs, other, dentry, nettrace, page, dlmtrace, error, emerg, ha, rpctrace, vfstrace, reada, mmap, config, console, quota, sec, lfsck, hsm

You may take a look at neterror, net.

The list of parameters (it is long, running on oss):
# lctl list_param -R | less
# lctl list_param -R | wc -l
error: list_param: /proc/fs/lustre/llite/*: Found no match
error: list_param: /proc/fs/lustre/qmt/*: Found no match


On Aug 1, 2016, at 11:28 AM, Thomas Roth <t.roth at gsi.de> wrote:

> Hi all,
> we are suffering from "temporarily unavailable" OSTs, where "temporarily" is a slight understatement, should read "permanently".
> Evicting the client on the OSS manually or deactivating+activating the OSTs in question works without problems.
> However, the clients are never evicted on Lustre's own. Obviously, the communication between client and OST is not dead entirely.
> Is there a way to read out the communication between such an osc - obdfilter pair? As the network people do with wireshark et al.?
> Cheers,
> Thomas
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