Silicon RAID controler
Heinz Mauelshagen
mauelshagen at redhat.com
Mon Sep 26 07:57:07 UTC 2005
On Sun, Sep 25, 2005 at 03:14:23PM +0200, Patrick Ale wrote:
> Hi All,
Hi Patrick.
>
> I tried the dmraid tool on my Silicon Image raidcontroler and was able to
> query the metadata.
> The metadata shown is correct for the logical volume.
>
> lilith:/home/patrick# dmraid -r
> /dev/hdi: sil, "sil_afajdfddahad", stripe, ok, 390718720 sectors, data@ 0
> /dev/hdk: sil, "sil_afajdfddahad", stripe, ok, 390718720 sectors, data@ 0
> lilith:/home/patrick# dmraid -s
> *** Active Set
> name : sil_afajdfddahad
> size : 781437440
> stride : 256
> type : stripe
> status : ok
> subsets: 0
> devs : 2
> spares : 0
Alright :-)
>
>
>
> Some funny things occure tho:
>
> - After an fdisk I have to reboot to reload the partition table. My guess is
> that this has to do with not calling the hardware directly but using the
> devmapper.
Yes, you need to rerun "dmraid -an;dmraid -ay" in order to activate
mappings for any changed/new partitions.
Of course no partitions should be active while changing them.
> - After an fsck 'df -hP' claims that 129MB is used. My question is; by what?
> It's an empty partition with just the lost+found directory.
If you're refering to an empty filesystem (ie, your one mounted
on /storage/sil-set0), that's filesystem metadata.
Filesystem need to store things like bitmaps, inode tables
and group descriptors which consume space even you haven't stored
any files on the filesystem yet.
>
> I also keep a log of my dmraid test activities and other stuff related to
> dmraid on my website: http://lilith.cathedrallabs.org/dmraid/
Naming got done this way in order to keep it unique in case you've
got multiple RAID controllers on a system (which is your case).
The names are persistant as well, which prevents you from nasty
name changes leading to eg, filesystems mounted on different mountpoints
after a reboot.
There's of course the option to symlink eg, /dev/mapper/sil* names
to /dev/ataraid/ entries.
>
> Another question I have: The ChangeLog et all mention that LSI Logic's
> Megaraid is supported. Does this also include the Megaraid used in Dell
> poweredges and HP DL380s?
Tell me ;-)
Presumably the RAID metadata hasn't changed on those: yes.
> If the answer is yes to this question then I should be able to help out
> testing and trying things for this part aswell.
Please do.
>
>
> With kind regards, Patrick
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--
Regards,
Heinz -- The LVM Guy --
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Heinz Mauelshagen Red Hat GmbH
Consulting Development Engineer Am Sonnenhang 11
Cluster and Storage Development 56242 Marienrachdorf
Germany
Mauelshagen at RedHat.com +49 2626 141200
FAX 924446
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