On Tue, Nov 03, 2009, Derrick Ryalls wrote: > On Tue, Nov 3, 2009 at 10:21 AM, Steve Polyack <kor...@comcast.net> wrote: > > Derrick Ryalls wrote: > >> > >> 1) In the event of a disk failure, how do I trace back the name such > >> as adX to a physical drive in the enclosure? Is there a way to take > >> the drive offline then use atacontrol to spin it down or something so > >> it is easy to identify? > >> > > > > In my opinion you are best off using glabel(8) to give names to the disks. > > This way you can name them in a way that makes sense to you. Additionally, > > when you create the ZFS pool you will use the glabel'd names. This means > > that the pool will still come up properly if something causes your devices > > to be numbered differently (i.e. a drive dies and you happen to reboot the > > system). > > I believe ZFS does this automatically. Supposedly, if you take a > working set of RAIDZ drives from one machine and put it in another, > ZFS will figure out the drives since they get labelled by ZFS > internally. My question concerns how to identify the physical disk in > question based on the adX or glabel name? Different name in software > is fine, but if the drive fails I want to make sure I pull the correct > drive.
This is only true if the metadata on the drives is re-read -- if your pool loses a drive and the device numbers shuffle, your pool will be FAILED on the next boot. You can, however, force the metadata to be re-read via a 'zfs export POOL', and a subsequent 'zfs import POOL'. However, using glabel avoid that step entirely, as ZFS will always see the 'right' devices in the right places, regardless of where they are physically. -Mahlon -- Mahlon E. Smith http://www.martini.nu/contact.html
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