Wow, thanks Jim for the accurate and detailed explaination! Indeed, this seems to have much to do with the NTFS/FUSE combination, as when I try to mount those external USB drives I could see a line in the log saying FUSE was being used here. I also did some tests with the iostat and iotop tools, and seems that in the time interval between the device being plugged in and when it gets opened as a folder on the client side, there's a process of 'nautilus --no-desktop <mountpoint>' running the 99% of the IO operations of the server, so I guess this is the culprit.
I also tried setting Alejandro's options, but it didn't seem to help. Any tips on why is that so expensive and how to reduce it a little bit? Again thank you guys! 2014-07-01 18:29 GMT+01:00 Jim Klimov <jimkli...@cos.ru>: > One point in the question was the USB drive's filesystem. > > Typically one would see FAT (aka pcfs for Solaris hosts) or NTFS > here, of which NTFS support in the Unixes is often done with an > userspace FUSE driver layer which tends to be slow even with the > faster devices (i.e. HDDs). USB Flash is rather slow as it is (raw), > and being USB over Ethernet does not help things much ;) > > Of course it is valid to see ext* or ufs or whatever on flashes, > but the other options are typically less portable and rarely used. > > Also, the "pcfs" in Solaris was historically also known to be > sub-performant, so AFAIK both Solaris 11 and illumos had projects > to rewrite it with a modern FAT supporting driver. But with your > OL hosts this part does not matter. > > I'd expect this to be a problem with NTFS/FUSE, primarily. > See if "iostat" and similar server-side tools yield anything > interesting regarding the disk traffic while it is being mounted? > > As a second option, it might be some networking speed mismatch > resulting in pathological bandwidths, though this would be also > visible with interactive (graphics) part of your sessions, probably. > For example, some gigabit switches for servers with poor buffering > settings or implementations were known to cause problems when the > downstream 10/100M DTUs were used, google for details if this rings > a bell for your setup. > > HTH, > //Jim Klimov > > > On 2014-07-01 18:29, Edwin Marqe wrote: > >> Hi Alejandro! >> >> I've indeed checked the log and it seems pretty normal apart of the >> speed issue. The device is detected a few seconds after plugging it in, >> but seems to be completely mounted about 40 seconds later (after which >> the nautilus navigator with the mounted drive is automatically shown). I >> think this will be a storage capacity problem, as if I plug in any 1-2 >> Gb USB drive it gets mounted a few seconds after. I've also tried >> plugging several >= 8 Gb USB drives and it happens with all of them, so >> I guess it's "normal", but I'd still like to know whether there's a way >> to enhace the speed of mounting. >> >> I'm using Oracle Linux 6.3 and SRS 5.4 here. >> >> Thanks for your help >> >> >> 2014-07-01 13:39 GMT+01:00 Alejandro Soler <aso...@martinaditrento.com >> <mailto:aso...@martinaditrento.com>>: >> >> >> Hi Edwin >> >> Not all devices and filesystems are well supported. Check the systems >> > > > > -- > > > +============================================================+ > | | > | Климов Евгений, Jim Klimov | > | технический директор CTO | > | ЗАО "ЦОС и ВТ" JSC COS&HT | > | | > | +7-903-7705859 (cellular) mailto:jimkli...@cos.ru | > | CC:ad...@cos.ru,jimkli...@gmail.com | > +============================================================+ > | () ascii ribbon campaign - against html mail | > | /\ - against microsoft attachments | > +============================================================+ > > > > > _______________________________________________ > SunRay-Users mailing list > SunRay-Users@filibeto.org > http://www.filibeto.org/mailman/listinfo/sunray-users >
_______________________________________________ SunRay-Users mailing list SunRay-Users@filibeto.org http://www.filibeto.org/mailman/listinfo/sunray-users
