[SunHELP] Disk Layout Issues...

[Fred Dikeman]

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Hi David,
We've been putting 40Gb disks in Ultra 5 & 10's on a regular basis for the
last two years without a problem.  Just stay away from Western Digital
drives. They work but they're a pain.

Fred Dikeman
Data Instruments, Inc


David Goldsobel wrote:

> Is it possible to put in a drive bigger than 20GB? According to the
> folks at Sun my ultra 10 can only handle drives up to 20 GB? I would
> love to know because I wanted to put up an FTP server and need more
> storage.
> Sorry to answer your question with a question
> David
>
> -----Original Message-----
> From: sunhelp-admin at sunhelp.org [mailto:sunhelp-admin at sunhelp.org] On
> Behalf Of Michael Vang
> Sent: Saturday, October 13, 2001 10:46 PM
> To: sunhelp at sunhelp.org
> Subject: [SunHELP] Disk Layout Issues...
>
> I'm assuming that having 2 disks versus 1 is better for a server
> layout...
>
> Would having / on disk 1 and /export/home on disk 2 be best?
>
> Or is there another layout, possibly with SDS, that is better...
>
> I figure using 2 swap slices is a good idea, too...
>
> I have the opportunity to purchase either 1 80GB disk or 2 40GB disks
> for my U5...
>
> I've already purchased the bracket for the 2nd disk, so I am leaning
> towards the 2 disk approach...
>
> I looked into mirroring, but it looks like a hack on the U5...
>
> -----
> When using Solstice DiskSuite 4.1 software, it is recommended that you
> have a minimum of three metadevice databases to maintain a "quorum." It
> is further recommended that the databases be maintained on different
> disks, which would require three IDE hard drives in the system. Because
> the Ultra 5 system can support only two hard drives, only two metadevice
> databases are possible. This limitation has a known impact.
>
> Solstice DiskSuite software will function with only two disks and two
> database replicas. However, if one disk fails, there is not a quorum. No
> problem with the system will be seen until after the system is powered
> down. After the system is powered down, it will not power on and boot in
> multiuser mode without system administration intervention.
>
> For example, if the quorum is not seen during boot due to a hard drive
> failure, the system boots in single-user mode. The problem is reported
> by the system when the machine is rebooted. The output is similar to the
> following example:
> -----
>
> I'm worried too about the CMD PCIO646 IDE chip on the U5...
>
> http://www.cmd.com/ApplicationNotes/0646UDesignTips.pdf
>
> Apparently there are issues with DMA operation when both channels are
> active...
>
> Any thoughts?
>
> Anyone have a U5 with 2 disks? How does it perform?
>
> This is for my new project: http://www.teamprimerib.com/freeshell.html
>
> Thanks!
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