Dear Luca, many thanks for the tip...in effect I was not sure about the mailing list I choose ;-P (BTW: I just subscribed to such mailing list...) Vega -----Messaggio originale----- Da: dm-devel-bounces@xxxxxxxxxx [mailto:dm-devel-bounces@xxxxxxxxxx] Per conto di Luca Berra Inviato: venerdì 9 novembre 2007 17.38 A: dm-devel@xxxxxxxxxx Cc: ataraid-list@xxxxxxxxxx Oggetto: Re: [dm-devel] - info about dm Vega, you should probably address dmraid related question to the ataraid mailing list. i am cc-ing the mentioned list, and doing a full quote for that reason On Wed, Nov 07, 2007 at 02:51:52PM +0100, Vega Forneris wrote: >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?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 > > CNR ? Servizi Informatici di Campo > Gestione servizi GRID > > Area di Ricerca Roma II - Tor Vergata > Via del Fosso del Cavaliere, 100 > 00133 Roma > > Tel: +39 06 4993 4667 > Fax: +39 06 4993 4650 > Email: Vega.Forneris@xxxxxxxxxxxxx >+--------------------------------------+ > > > >-- >dm-devel mailing list >dm-devel@xxxxxxxxxx >https://www.redhat.com/mailman/listinfo/dm-devel -- Luca Berra -- bluca@xxxxxxxxxx Communication Media & Services S.r.l. /"\ \ / ASCII RIBBON CAMPAIGN X AGAINST HTML MAIL / \ -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel _______________________________________________ Ataraid-list mailing list Ataraid-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ataraid-list
