the short version: Can mdadm use /dev/sgX as devices? (and if so, how?) the longer version is: I inherited a 6-bay IBM x3655 with a ServeRAID-8k RAID controller (from docs, it seems to be an 8-port Adaptec 9580W SAS/SATA controller). I'd like to run Ubuntu 10.04. I can use the controller BIOS on boot to config and set up a RAID5 (which presents to the OS as '/dev/sda' - the 'very large device'. However there's no way to add notification of disk failure. There are some GUI Java-based packages which claim to be able to do this (a 32bit Java RaidManager (RaidMan), which seems to be a re-badged Adaptec StorageManager (StorMan - also available in a true 64bit version) which I've managed to get running but they both lock up in various ugly and opaque ways. Along with the Java GUI apps is an Adaptec commandline app called 'arcconf' that allows you to peek at the controller and does allow a primitive amount of control (but not email notification of disk failure). I'd prefer to use mdadm since it's simpler and mostly 'just works and does email notifications. However, the controller does not translate the /dev/sgX addresses to the /dev/sdX devices that mdadm seems to want. - lspci says: 05:00.0 RAID bus controller: Adaptec AAC-RAID (Rocket) (rev 02) - The boot process does not load the aacraid driver, but it can be modprobed manually. This doesn't change much tho: # lsmod |grep aacraid aacraid 76291 0 - dmesg shows: [ 3.394749] scsi 0:1:0:0: Attached scsi generic sg1 type 0 [ 3.394877] scsi 0:1:1:0: Attached scsi generic sg2 type 0 [ 3.394981] scsi 0:1:2:0: Attached scsi generic sg3 type 0 [ 3.395085] scsi 0:1:3:0: Attached scsi generic sg4 type 0 [ 3.395190] scsi 0:1:4:0: Attached scsi generic sg5 type 0 [ 3.395296] scsi 0:1:5:0: Attached scsi generic sg6 type 0 [ 3.395427] scsi 0:3:0:0: Attached scsi generic sg7 type 13 (The last is the controller) - # sg_scan shows /dev/sg0: scsi1 channel=0 id=0 lun=0 [em] /dev/sg1: scsi0 channel=1 id=0 lun=0 [em] /dev/sg2: scsi0 channel=1 id=1 lun=0 [em] /dev/sg3: scsi0 channel=1 id=2 lun=0 [em] /dev/sg4: scsi0 channel=1 id=3 lun=0 [em] /dev/sg5: scsi0 channel=1 id=4 lun=0 [em] /dev/sg6: scsi0 channel=1 id=5 lun=0 [em] /dev/sg7: scsi0 channel=3 id=0 lun=0 [em] /dev/sg8: scsi2 channel=0 id=0 lun=0 [em] /dev/sg9: scsi7 channel=0 id=0 lun=0 [em] # sg_map /dev/sg0 /dev/scd0 <- cdrom /dev/sg1 < no /dev/sdX mapping /dev/sg2 /dev/sg3 /dev/sg4 /dev/sg5 /dev/sg6 /dev/sg7 <- controller /dev/sg8 /dev/sda <- broadcom severworks SATA disk /dev/sg9 /dev/sdb <- USB thumbdrive -- Harry Mangalam - Research Computing, NACS, Rm 225 MSTB, UC Irvine [ZOT 2225] / 92697 949 824-0084(o), 949 285-4487(c) MSTB=Bldg 415 (G-5 on <http://today.uci.edu/pdf/UCI_09_map_campus.pdf> -- Non-sarcarstic use of 'seamless' in any context having to do with computers immediately disqualifies the speaker as an expert. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
