Filesystem corruption and bad perfomance with SRCS16 and PAE (raid 5 2TB)

Andras Gót andrej at
Tue Feb 6 21:12:51 UTC 2007


Can you try the AMD64 version on that server?


Artem Kuchin wrote:
> Hello!
> I've got an Intel  2400A  server to install FBSD. It has 4GB RAM,
> SRCS16 raid controller, configured 2TB (actually a little less, about 
> 1.9TB) RAID-5 array, Xeon 3.2Ghz
> Recently i have installed 6.2-R, cvsupped it to 6.2-STABLE
> (today, thanks to included csup utility, very convinient) and
> decided to turn on PAE so i can utilize all 4GB of RAM (w/o PAE
> i am loosing 512MB, too bad).
> I did that and then tried to run perl. Got  "segmantaion fault".
> Ignored  that and tried to copy port tree and then i found
> out that some files are damanged and connot be read. Also,
> directoried could not be deleted because it is not empty, but when
> i do ls in that dir it IS empty. weird.
> Booted single user, did fsck - found  a buch of errors, many
> softupdate inconsistencies.
> Fixed them. Rebooted (still in PAE). Run buildworld and
> copy ports tree at the same time. AFter 10 minutes again the same
> errors.
> Built a kernel without PAE, installed, rebooted in single user,
> fixed all filesystems, booted multiuser, run buildworld and copy of
> ports tree. Everything is okay. Did it many times. Still everything is 
> ok.
> Is it something bad about amr driver working under PAE?
> Also, with and after running in PAE (i mean, run PAE kernel,
> then install normal kernel and run it) the kernel compains like this
> _vfs_done(): amrd0 [WRITE(offset=8192, length=1536)] error = 5
> (no other message before  or aftrer this, disks are fully okay becuase
> dd works like a charm)
> Also, i did a simple thing
> dd if=/dev/amrd0 of=/dev/null bs=1M (tried 2m, 5m, 512k)
> The throughoutput is about 29MB/sec w/o PAE and 27MB/sec with PAE
> Did the same on a very old DUal Pentium III with 3Ware 7xxxx with RAID-5
> array and older harddrives. Got over 50Mb/sec.
> unixbench show terrible number for file perfomance.
> Why the heck amr is so slow?
> -- 
> Regards,
> Artem Kuchin
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