I believe that some admins do not have enough time to sit and find the documentation. I have seen it more than once that an admin just don't want to read the docs since it's like the "ocean" or something similar. Eliezer ---- Eliezer Croitoru Linux System Administrator Mobile: +972-5-28704261 Email: eliezer@xxxxxxxxxxxx -----Original Message----- From: squid-users [mailto:squid-users-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Marcus Kool Sent: Sunday, March 19, 2017 2:36 PM To: squid-users@xxxxxxxxxxxxxxxxxxxxx Subject: Re: SMP and AUFS The root cause of why admins configure SMP + [A]UFS is the lack of good documentation. A few lines in the wiki and squid.conf.documented should be enough. Marcus On 19/03/17 06:11, Eliezer Croitoru wrote: > I think that some warning message like "WARNING: be sure you know that UFS\AUFS doesn't support SMP\MultiWorkers" should be added to the stderr or cache.log. > > Eliezer > > ---- > Eliezer Croitoru > Linux System Administrator > Mobile: +972-5-28704261 > Email: eliezer@xxxxxxxxxxxx > > > -----Original Message----- > From: squid-users [mailto:squid-users-bounces@xxxxxxxxxxxxxxxxxxxxx] > On Behalf Of senor > Sent: Sunday, March 19, 2017 7:12 AM > To: squid-users@xxxxxxxxxxxxxxxxxxxxx > Subject: Re: SMP and AUFS > > On 3/17/2017 7:45, Alex Rousskov wrote: >> On 03/16/2017 10:42 PM, senor wrote: >> >>> I understand that AUFS is not SMP aware but if each worker has its >>> own AUFS cache is there any problem other than the inefficiencies of >>> duplicate cache? >> >> Yes. Clients may get stale cached entries, possibly breaking advanced >> HTTP transactions that rely on a more-or-less compliant proxy cache. >> >> Also, I do not know exactly how local and shared cache indexes >> interact when SMP-unaware store updates its local index without >> updating the shared one. Most likely, such partial updates lead to >> bugs. You may reduce bugs probability by not mixing shared and >> ufs-based stores in SMP mode, but I doubt you can eliminate all problems that way. >> >> >>> I'm pretty sure that AUFS is used with squid running in SMP mode a lot. >> >> I can think of many examples where a lot of people do things they >> should not be doing and do not do things they should be doing. Just >> because many use X to solve some problem, does not make using X a >> good idea and certainly does not make it the best solution available. >> >> >>> The squid wiki even has a CARP configuration example for this combination. >> >> I hope there are no official examples advertising SMP AUFS >> configurations. If there are, they should be removed IMO. >> >> Alex. >> > There are many references in the squid wiki, FAQ and Knowlegebase > about SMP but I don't see any of them reflecting the concerns you have > brought up. My point in mentioning that there are a lot of > installations using SMP and AUFS is that something widely used but > buggy tends to be brought up on this email list and I haven't seen it. > > I'm not trying to claim there are no problems. I'm just making sure my > expectations are realistic. Your comments were the first I became > aware anyone thought poorly about the combination of AUFS with SMP. > Rock is of course preferred but it comes with more baggage than AUFS. > My own experience has been pretty good. Maybe just lucky. > > Senor > _______________________________________________ > squid-users mailing list > squid-users@xxxxxxxxxxxxxxxxxxxxx > http://lists.squid-cache.org/listinfo/squid-users > > _______________________________________________ > squid-users mailing list > squid-users@xxxxxxxxxxxxxxxxxxxxx > http://lists.squid-cache.org/listinfo/squid-users > _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
