2550 and 660F problems

Henrik Beckman henrik.beckman at sgu.se
Wed Mar 6 05:46:00 CST 2002



Problems
1) / gets corrupted everytime it is written to (file or folder is created).
/ is on internal mirrored disk on aacraid, all partitions are ext2, only 
/ have problems.
Have tried 2.4.14 and 2.4.9-21RH but corruption still occurs .14 had 
standard aacraid .9-21 had new aacraid.

2)Performance from the array is not good enough.
Array is 13x73 raid5 on a qlogic 2200.
Filesystem is sgi xfs.


2550 2x1266Mhz, 1Gb RAM
660F 256Mb 14x73 (one hotspare)

[root@### bonnie++-1.02a]# ./bonnie++ -u ######  -d /dsk/st00a/slask

2.4.14 13x73 RAID5 qlogic 2200 (4.46.5)

Version 1.02a         ------Sequential Output------             
--Sequential Input-            --Random-
                                -Per Chr-        --Block--       
-Rewrite-       -Per Chr-       --Block--       --Seeks--
Machine        Size     K/sec     %CP     K/sec     %CP     K/sec    
 %CP     K/sec     %CP     K/sec     %CP      /sec     %CP
###.###.##     2G      13123      73       36933      18       13249    
    7     11384       67     33265        9      547.9       2
                          
            ------Sequential Create------            --------Random 
Create--------
                           -Create--      --Read---        -Delete--     
   -Create--         --Read---     -Delete--
             files      /sec     %CP  /sec     %CP      /sec     %CP    
  /sec     %CP      /sec     %CP  /sec     %CP
                16       506       7    +++++      +++       558       
7       540         6     +++++     +++   457       6
###.###.##,2G,13123,73,36933,18,13249,7,11384,67,33265,9,547.9,2,16,506,7,+++++,+++,558,7,540,6,+++++,+++,457,6 





2.4.9-21 13x73 RAID5 qlogic 2200 (5.36.3)

Version 1.02a           ------Sequential Output------             
--Sequential Input-         --Random-
                                -Per Chr-        --Block--         
-Rewrite-     -Per Chr-     --Block--     --Seeks--
Machine        Size     K/sec     %CP     K/sec     %CP     K/sec    
 %CP     K/sec     %CP     K/sec     %CP      /sec     %CP
###.###.##       2G     12102      68     13544       7     11751       
6     11064      67     45880      14     519.6       3
                
               ------Sequential Create------             --------Random 
Create--------
                             -Create--          --Read---         
-Delete--         -Create--         --Read---        -Delete--
              files      /sec     %CP      /sec     %CP      /sec    
 %CP      /sec     %CP      /sec     %CP      /sec     %CP
                 16        94       1     +++++     +++       110       
1        94       0     +++++     +++        98       1
###.###.##,2G,12102,68,13544,7,11751,6,11064,67,45880,14,519.6,3,16,94,1,+++++,+++,110,1,94,0,+++++,+++,98,1



2.4.9-21 Mirror 17GB aacraid (Alan Cox driver)

Version 1.02a           ------Sequential Output------             
--Sequential Input-         --Random-
                               -Per Chr-        --Block--        
-Rewrite-        -Per Chr-       --Block--     --Seeks--
Machine        Size     K/sec     %CP     K/sec     %CP     K/sec    
 %CP     K/sec     %CP     K/sec     %CP      /sec     %CP
###.###.##     2G     17967      99     33188      15      6814       
4     12604      75     47434      14     325.5       1
                
               ------Sequential Create------             --------Random 
Create--------
                             -Create--         --Read---         
-Delete--        -Create--        --Read--       - -Delete--
              files      /sec     %CP      /sec     %CP      /sec    
 %CP      /sec     %CP      /sec     %CP      /sec     %CP
                 16      2571      99     +++++     +++     +++++    
 +++      2641      99     +++++     +++     10115     100
###.###.##,2G,17967,99,33188,15,6814,4,12604,75,47434,14,325.5,1,16,2571,99,+++++,+++,+++++,+++,2641,99,+++++,+++,10115,100


As I see it I either go for xfs all the way or I switch over to ext3, I 
would prefer xfs.
I will rebuild the 660F with stripesets to se if I can get better 
performance, and I will format / and reinstall os to se if I can get rid 
of the fs corruption.

Anyone got a better idea ?

Any tips or hints are welcome.

/Henrik









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