I am setting up a DS20 server (TRU64 4.0F) with a RAID Array 8000 attached using a HSZ80 SCSI controller. I have created a file domain with a series of filesets mounted up using ADVFS to store large numbers of small files. There will be a fileset for each month, and then a directory beneath that for each day. Typically each daily directory will store 90,000 to 100,000 small files in it. When copying large volumes of data to these filesets I am seeing a very noticable degredation in performance as the copy progresses.
I have produced the report below showing the number of files which were copied during each minute of the copy process based on cutting up the output of an 'ls -l' command.
Time Files copied.
12:57 10556
12:58 7564
12:59 6387
13:00 5389
13:01 4821
13:02 4228
13:03 3817
13:04 3625
13:05 3414
13:06 3236
13:07 3007
13:08 2849
13:09 2764
13:10 2607
13:11 2497
13:12 2410
13:13 2309
13:14 2266
13:15 2167
13:16 2117
13:17 2084
13:18 2012
13:19 1936
13:20 1931
13:21 1858
13:22 1820
13:23 1761
13:24 1735
13:25 1701
13:26 1299
The copy was done using 'cp -r' from one fileset to another.
Can anyone tell me whether this is normal, or whether there is any ADVFS performance tuning that I can do to improve this to remove the performance degradation?
Regards,
Bryan Mills.
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Received on Wed Jun 20 2001 - 14:21:41 NZST