Date: Tue, 5 Mar 2002 22:06:24 -0700 From: "Long, Scott" <Scott_Long@btc.adaptec.com> To: "'Patrick Thomas'" <root@utility.clubscholarship.com>, Tom Samplonius <tom@sdf.com> Cc: freebsd-scsi@freebsd.org Subject: RE: Dell PERC scrub / scrubbing question Message-ID: <CEDF5AA24668244F8D529010E2955A940A7602@btcexc01.btc.adaptec.com>
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Specifically, what kind of controller is this? There were several sub-models of the Dell PERC2. Tom is correct, a scrub is when all blocks on a redundant array (0, 5, 10, 50, etc) are read and the mirror/parity data is recalculated and written. On some controllers, the array can be used while the scrub is in progress, but this slows down both the scrub operation and the I/O to the array. If the scrub completes but then starts again after a reboot it could be either a bug in the firmware on the card, or that the card may not be getting shut down correctly and the firmware is starting a scrub to verify that no data was lost. Please send me your dmesg output so I can determine if I can help you with some specific debugging procedures. Scott > -----Original Message----- > From: Patrick Thomas [mailto:root@utility.clubscholarship.com] > Sent: Tuesday, March 05, 2002 12:13 AM > To: Tom Samplonius > Cc: freebsd-scsi@freebsd.org > Subject: Re: Dell PERC scrub / scrubbing question > > > > These are mirrors I have created, though...RAID 1. Comments > ? (please :) > > --PT > > > > > When I created my mirrors originally with my Dell PERC 2 > controller, they > > > immediately started scrubbing. The BIOS told me not to > use them until > > > they were done scrubbing. Fair enough. > > > > Depends on what they mean by scrubbing. It usually takes > a long time to > > initialize a RAID5 volume, because the parity is created > for the first > > time. > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-scsi" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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