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From: hume.spamfilter on 9 Sep 2009 07:20
I've got a server on a Dell Poweredge 1850, using the onboard MegaRAID LSI
driver to mirror a pair of internal disks (I didn't build it this way, it
was the standard setup for the Linux admins).

I've got Solaris 10 U6, fully patched as of this morning, with ZFS root.
Overall, the machine works great... it has lots of RAM, and is only a
mail hub... most of the mail only exists in RAM long enough to be relayed.

However, I AM seeing odd pauses during I/O. A 'df' will hang for a second
or two after the first line. scp-ing a large file onto the box will move a
few megs and then hang for a few seconds, then move a few megs, etc etc.

This strikes me as similar behaviour to trying to use ZFS on a SAN without
disabling write caching, but I'm trying not to leap to conclusions.

--
Brandon Hume - hume -> BOFH.Ca, http://WWW.BOFH.Ca/
From: solx on 9 Sep 2009 07:44
hume.spamfilter(a)bofh.ca wrote:
> I've got a server on a Dell Poweredge 1850, using the onboard MegaRAID LSI
> driver to mirror a pair of internal disks (I didn't build it this way, it
> was the standard setup for the Linux admins).
>
> I've got Solaris 10 U6, fully patched as of this morning, with ZFS root.
> Overall, the machine works great... it has lots of RAM, and is only a
> mail hub... most of the mail only exists in RAM long enough to be relayed.
>
> However, I AM seeing odd pauses during I/O. A 'df' will hang for a second
> or two after the first line. scp-ing a large file onto the box will move a
> few megs and then hang for a few seconds, then move a few megs, etc etc.
>
> This strikes me as similar behaviour to trying to use ZFS on a SAN without
> disabling write caching, but I'm trying not to leap to conclusions.
>
Hi

Never had a problem like that with LSI MegaRAID SCSI controllers.
From: Chris Ridd on 9 Sep 2009 08:38
On 2009-09-09 12:44:35 +0100, hume.spamfilter(a)bofh.ca said:

> I've got a server on a Dell Poweredge 1850, using the onboard MegaRAID LSI
> driver to mirror a pair of internal disks (I didn't build it this way, it
> was the standard setup for the Linux admins).
>
> I've got Solaris 10 U6, fully patched as of this morning, with ZFS root.
> Overall, the machine works great... it has lots of RAM, and is only a
> mail hub... most of the mail only exists in RAM long enough to be relayed.
>
> However, I AM seeing odd pauses during I/O. A 'df' will hang for a second
> or two after the first line. scp-ing a large file onto the box will move a
> few megs and then hang for a few seconds, then move a few megs, etc etc.
>
> This strikes me as similar behaviour to trying to use ZFS on a SAN without
> disabling write caching, but I'm trying not to leap to conclusions.

I would ask the ZFS gods directly at zfs-discuss(a)opensolaris.org.

--
Chris

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