>>> On Tue, 28 Oct 2025 20:01:41 +0000, Peter Grandi via >>> lustre-discuss <[email protected]> said:
> * [...] Reading is quite good for all clients. But since > yesterday early afternoon inexplicably the clients .13-36 > have a maximum average write speed of around 35-40MB/s; but > if I mount 'temp01' on any of the Lustre servers (and I > usually have it mounted on the MDT .40) write rates are as > good as before. [...] Also a whole set of workstations with ULTS 22 + Lustre 2.15 are not affected. I have been looking at various aspects of LNET and for example when I do 'lnetctl export' 'tx_min_credits' on some systems are negative so I guess I can increment them, but on one of the affected systems I looked at the tx_max_credits was 8 and the 'tx_min_credits' were all positive. One curious side node is that I get significantly lower write rates when with 'lnetctl set discovery 0' than when it is enabled. Both the Lustre servers and clients I have mentioned have 4 interfaces but only one has an IP address and is connected to a switch, so multirail should not have any impact, as far as I can imagine. _______________________________________________ lustre-discuss mailing list [email protected] http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
