[SunHELP] Moving a DiskSuite array

[George Munk]

Phil,

As stated in the earlier reply, the stripe can be re-created. See the -k
option to metainit.

As you noted, losing swap is a bad thing no matter what it is running
on. Is seems to me the down side of putting swap on a stripe is that the
probability of losing swap is greater than if it were running on a
single partition. With current disk reliability, running swap on a
stripe might still be a relativily low probability problem compared to
other things that can happen.


George


> -----Original Message-----
> From: Phil Stracchino [mailto:alaric at caerllewys.net]
> Sent: Saturday, June 14, 2003 5:45 PM
> To: SunHELP
> Subject: [SunHELP] Moving a DiskSuite array
>
>
> OK, folks, here's a couple of questions for y'all.
>
>
> I have machine A, an Ultra1 running Solaris8, with an
> attached 711 disk
> pack stuffed full of 9G Cheetahs with ...  um, lemmesee ...   five
> stripes across them.  I also have machine B, an Ultra30 running
> Solaris9.  I would like to detach the 711 from machine A and attach it
> to machine B.
>
> Can I do this non-destructively by copying the appropriate lines
> from machine A's /etc/lvm/md.cf to machine B?  If this won't work, is
> there some other way to move the array non-destruvtively?  Or must I
> recreate all the stripes from scratch on machine B after
> moving the 711,
> then restore the data from tape?
>
>
> On a related subject:  In Linux, if you create two swap partitions of
> the same size and assign them the same swap priority, the
> kernel is smart
> enough to automatically (and silently) stripe them for faster swap
> performance.  Solaris, I know, does not do so.  Can swap on a Solaris
> machine be placed on a stripe metadevice without ill effects?
>  When I've
> tried it, I've seen odd error messages about overlapping swap
> areas, but
> it seemed to work, so I don't know whether this is a serious error or
> just a case of the kernel running into something it didn't expect.
>
> (As a side note, when I've discussed this subject elsewhere
> in the past,
> people have said that having swap on a striped device is dangerous if
> you lose a disk, but it seems to me that if you lose a disk that has
> active swap in use on it, you're in a world of hurt regardless of
> whether the swap was striped or not.  So this seems like a specious
> argument.  If someone can explain to me why it isn't, please
> elucidate.)
>
>
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