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Dear all, I just installed Scientific
Linux 5 and I used for the first time DM drivers for working with the embedded
RAID (the servers are IBM xSeries, with an Adaptec HostRAID ASR - SATA). I
really appreciate the fact that now Linux is able to recognize such devices,
but I had some troubles configuring it and I’d like to have some info for
better understanding how things work. I’ll be a little
“verbose” for clarifying what I did and which are my doubts… 1)
Installation & Configuration I
installed SL5 on a system which was running SL3 with HW drivers released by
IBM. Linux was able to identify correctly the device (installed through CD),
mapped it as /dev/mapper/asr_ and proceeded with he installation. Anyway,
I found a little problematic configuring it manually: I tried to install SL5 on
a node which was misconfigured: instead of seeing one device, it was managing
the 2 HD (/dev/sda and /dev/sdb) as 2 separate devices an if I tried to
configure them (at install time, via CD or network boot) with DM, I got many errors about the RAID
table (“ERROR: asr: Invalid RAID config table checksum on /dev/sda”
or even “asr: Invalid magic number in RAID table; saw 0x0
expected…”). I tried to reconfigure the RAID card first via BIOS
and then trying again
to configure it via Linux (“dmsetup create …”) but even if it
seemed working (exit code 0), then querying the device asr_ (i.e. “dmraid
–r”) resulted in errors as reported above…or better, dmraid
commands (-r, -ay, -tay,…) reported errors, while dmsetup commands (status, ls,…) worked normally. The
only way I found for well-configuring the device was to install SL3 with
specific drivers, and then to install SL5 with DM…all both commands now
work perfectly In
brief: If
I try to configure DM-RAID from scratch and I get such errors, how can I do?
What’s that “RAID table”? Where is it written? Not in the MBR
of an HD, ‘cause I tried to copy the MBR of the cloned disk which had no
problem (still recognized as “good” for RAID and DM) and nothing
changed… 2)
Managing disks I
configured disks in RAID 1 (mirror) but I wonder how to manage this RAID; in
particular, how can I do for: - stopping a device (disk) and put it
offline/and viceversa? - reconfiguring/rebuilding it (due to
broken/faulting HD)? At
the moment I should change a couple of disks (SMARTD warnings reported), but I’m
scared about the “RAID table error”… Many Thanks in advance for
all help you can give me… Best Regards Vega Forneris +--------------------------------------+ Vega Forneris
Gestione servizi GRID
Fax: +39 06 4993
4650 Email: Vega.Forneris@xxxxxxxxxxxxx +--------------------------------------+ |
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