HI, i have a problem with gfs.. 3 nodes: (rhel5.2 x64) connected to san network to eva4400. and i have one gfs1 file system (about 1TB)shared through three nodes if i place php-code on gfs fs - i have performance in 10 times lower than on ext3 fs in the same storage test i do from one node (1), second and third node doing nothing.. only mounted a gfs partition when php-code is being on gfs vmstat look like this procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 7 0 308 7488148 3032 176300 0 0 248 152 1080 347400 3 28 68 1 0 5 0 308 7487032 3032 176312 0 0 1 1 1014 387835 2 31 67 0 0 1 0 308 7486504 3032 176692 0 0 0 0 1011 386325 2 30 68 0 0 13 0 308 7486380 3032 176700 0 0 0 0 1017 391721 2 31 67 0 0 5 0 308 7485884 3032 176784 0 0 0 0 1011 378043 3 29 68 0 0 5 0 308 7485512 3056 176760 0 0 5 321 1030 388592 2 32 66 0 0 8 0 308 7485388 3056 176864 0 0 0 0 1011 375568 2 30 68 0 0 and on ext3 fs procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 60 0 308 6731144 57744 184440 0 0 0 0 21343 56952 53 42 5 0 0 44 0 308 6730152 57756 184540 0 0 0 60 20975 56834 53 41 6 0 0 48 0 308 6728912 57760 184620 0 0 4 0 21094 60327 52 41 6 0 0 27 0 308 6729284 57764 184792 0 0 1 1 21464 58993 48 36 16 0 0 8 0 308 6730028 57792 184852 0 0 0 1004 21048 52217 42 29 29 0 0 11 0 308 6730152 57792 184960 0 0 0 0 20631 48064 33 21 46 0 0 4 0 308 6729656 57804 185040 0 0 0 52 19673 38394 22 13 65 0 0 4 0 308 6729284 57804 185116 0 0 5 1 18023 32104 19 10 71 0 0 4 0 308 6729284 57804 185184 0 0 0 0 17620 30895 18 10 73 0 0 context switches on gfs about 380000/s, but on ext3 about 50000/s a tried tune gfs: - mount noatime,noquota,nodiratime - set statfs_fast = 1 - increasing statfs_slots how i can increase performance ? -- wbr, Sergey Skipidarov -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
