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using raid devices raw, loop devices ?

To: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
Subject: using raid devices raw, loop devices ?
From: Larsen, Tore Høivaag <tore.hoivaag.larsen@xxxxxxxxxxxxxx>
Date: Wed, 5 Jan 2011 08:59:59 +0000
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Thread-index: AQHLrLbuml7ejoxV20GtlM6UyRyIsw==
Thread-topic: using raid devices raw, loop devices ?
Lots of people is using >2TB luns labeled loop and using major device. 

# parted -s /dev/sdd print
Disk geometry for /dev/sdd: 0.000-10486938.000 megabytes
Disk label type: loop
Minor    Start       End     Filesystem  Flags
1          0.000 10486938.000  xfs     
            ^^^^

Comments?   What causes the occasional corruption? Boot time fsck, dmraid?  
Volume manager daemons?


# parted -s /dev/sdd print
Disk geometry for /dev/sdd: 0.000-10486938.000 megabytes
Disk label type: loop
Minor    Start       End     Filesystem  Flags
1          0.000 10486938.000  xfs         
[root@argus-vnq1 TSDCLI-v2.3.zip]# dmesg | grep sdd
sdd : very big device. try to use READ CAPACITY(16).
SCSI device sdd: 21477249024 512-byte hdwr sectors (10996352 MB)
SCSI device sdd: drive cache: write back
sdd : very big device. try to use READ CAPACITY(16).
SCSI device sdd: 21477249024 512-byte hdwr sectors (10996352 MB)
SCSI device sdd: drive cache: write back
 sdd: unknown partition table
Attached scsi disk sdd at scsi8, channel 0, id 0, lun 0
XFS mounting filesystem sdd
Starting XFS recovery on filesystem: sdd (dev: sdd)
Ending XFS recovery on filesystem: sdd (dev: sdd)




Regards,
ToreL
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