On Tuesday 20 April 2004 01:21, Markus Schabel wrote: > Jeremy Zawodny wrote: > > On Monday, April 19, 2004, at 03:07 PM, Markus Schabel wrote: > >> well, i see the same problem as everybody here: i've had some > >> corrupted reiserfs systems, and it wasn't possible to restore the > >> data (except backups of coures ;)). We're still running reiserfs on > >> our proxy servers (squid), but we have the phenomenon that the > >> machines get slower and slower while squid is running, and if you > >> stop squid and wait some time and start it again it all goes fine > >> again. but the problem isn't squid, it seems to be reiserfs which > >> seems to be not able get all data written to disk in time and slows > >> the computer down. (sure this also depends on the harddisks, but we > >> played around with hdparm and the situation was exactly the same > >> with DMA enabled (140MB/s) and disabled (4MB/s), so it cannot be > >> the HDD).
For what it's worth: I've had opposite experiences. At one time I had what looked like severe filesystem corruption on my reiserfs disk. But it repaired it without any problems. I've been using it for at least 3 or 4 years now, on all my systems, ranging from laptops to a 0.4 TB raid5 fileserver and I am very happy with both the speed and the reliability. > > I'm confused. How does measuring sequential read/write performance > > map to squid performance? Doesn't squid usually do lots of little > > read/write ops, with lots of seeks too? > > well, the idea was to check if system performance would be influenced > by HDD speed. sure sequential read/write is not really the best test > for this, but i thougth we would see some changes, and since we didn't > the idea was that the HDD isn't the bottleneck. and since the system > behavior is better with ext3 than with reiserfs, the bottleneck may be > the filesystem. I think reiserfs is better than ext3 for lots of small files. Well, actually I think reiserfs is better <period> but then again, I might be biased... ;-) > is it possible to log HDD access (e.g. open, close, read, write, seek, > etc. operations)? Sure. man iostat (package sysstat) (Or give bonnie a try if it is only for benchmarking) Maarten -- Linux: Because rebooting is for adding hardware. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
