[Lustre-discuss] OST outage = client freeze?

[Lukas Hejtmanek]

Hello,

I'm still playing with Lustre. I wanted to know what happens, if one of OSTs
disappear. 

So I created a file (it seems that the file is stored only to one OST, is it
expected?), I unmounted the OST from the metadata server, I tried to read the
file and the reading process is frozen (is is about 18 hours now).

I would expect that I/O error will be returned.

In dmesg I have:
[75510.730390] Lustre: 2111:0:(import.c:395:import_select_connection())
Skipped 24 previous similar messages
[76060.424140] LustreError: 11-0: an error occurred while communicating with
195.113.235.225 at tcp. The ost_connect operation failed with -19
[76060.424197] LustreError: Skipped 24 previous similar messages
[76135.381367] Lustre: 2111:0:(import.c:395:import_select_connection())
l_smaug2-OST0002-osc-ffff8104371bbc00: tried all connections, increasing
latency to 21s
[76135.381432] Lustre: 2111:0:(import.c:395:import_select_connection())
Skipped 24 previous similar messages
[76685.075827] LustreError: 11-0: an error occurred while communicating with
195.113.235.225 at tcp. The ost_connect operation failed with -19
[76685.075885] LustreError: Skipped 24 previous similar messages
[76760.031536] Lustre: 2111:0:(import.c:395:import_select_connection())
l_smaug2-OST0002-osc-ffff8104371bbc00: tried all connections, increasing
latency to 51s
[76760.031601] Lustre: 2111:0:(import.c:395:import_select_connection())
Skipped 24 previous similar messages
[77309.725917] LustreError: 11-0: an error occurred while communicating with
195.113.235.225 at tcp. The ost_connect operation failed with -19
[77309.725977] LustreError: Skipped 24 previous similar messages
[77384.683624] Lustre: 2111:0:(import.c:395:import_select_connection())
l_smaug2-OST0002-osc-ffff8104371bbc00: tried all connections, increasing
latency to 51s
[77384.683689] Lustre: 2111:0:(import.c:395:import_select_connection())
Skipped 24 previous similar messages

-- 
Lukáš Hejtmánek