server freezes with this error kernel: ata1.00: exception Emask 0x0 SAct 0x7fffffff SErr 0x0 action

[gurulakshman]

1. How can u check this is fake RAID
2. Also is it problem with rad disk or with sata cables

Please find the messages log at http://hyperwebenable.com/log/messages

i have run this command dmraid -r
[root@hyperwebenable ~]# dmraid -r
/dev/sda: ddf1, ".ddf1_disks", GROUP, ok, 976494592 sectors, data@ 0
/dev/sdb: ddf1, ".ddf1_disks", GROUP, ok, 976494592 sectors, data@ 0

[pschaff]

Don't use obsolete/unsupported releases - 5.7 is the current CentOS-5 release. See the [url=http://wiki.centos.org/Manuals/ReleaseNotes/CentOS5.7]CentOS 5.7 Release Notes[/url] for details. By not updating you are implicitly accepting that you will live with numerous bugs and security issues (and associated known exploits) that have subsequently been fixed.

Try a google on [url=https://www.google.com/search?q=dmraid+fakeraid+OR+hostraid&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a&safe=active]dmraid fakeraid OR hostraid[/url] for background, but it seems pretty clear you have FakeRAID. For a more definitive answer please [url=http://www.centos.org/modules/newbb/viewtopic.php?topic_id=28723&forum=54]provide more information about your system[/url] by running "./getinfo.sh" as [url=http://wiki.centos.org/TipsAndTricks/BecomingRoot]root[/url] and showing us the output file.