Richard, thank you so very much!
This is the kind of answer I expected from Sun Storage.
I will do more studies before I speak again.
Happy holidays!!!
z
- Original Message -
From: Richard Elling [EMAIL PROTECTED]
To: Joseph Zhou [EMAIL PROTECTED]
Cc: William D. Hathaway [EMAIL PROTECTED];
zfs-discuss@opensolaris.org; [EMAIL PROTECTED];
[EMAIL PROTECTED]
Sent: Sunday, December 07, 2008 12:57 AM
Subject: Re: [zfs-discuss] Hardware Raid Vs ZFS implementation on
SunX4150/X4450
Joseph Zhou wrote:
Yeah?
http://www.adaptec.com/en-US/products/Controllers/Hardware/sas/value/SAS-31605/_details/Series3_FAQs.htm
Snapshot is a big deal?
Snapshot is a big deal, but you will find most hardware RAID
implementations
are somewhat limited, as the above adaptec only supports 4 snapshots and
it is an
optional feature. You will find many array vendors will be happy to
charge lots
of money for the snapshot feature.
Windows OS does that too.
Not the Windows OS I run on my laptop. But the feature seems to be best
integrated
on Max OSX.
Compression -- where is the performance data showing compression in
OpenSolaris has little overhead?
If you search these archives you will find instances where compression
performance is much faster than not, and you will find instances where
compression has significant overhead. YMMV. As with most things,
there are engineering and design trade-offs that you should consider.
Clones -- tell me the benefit of Clone when we have point-in-time copies
with continuous, policy-based protection? And snapshot images are mostly
writable and sync-able today?
In ZFS, snapshots are read-only. Clones are created from a snapshot
and can be writable. We use clones extensively for OS upgrading and
patching. For example, when you upgrade OpenSolaris, we clone the
OS file systems and upgrade the clone, so that you can move forward
or roll back to different versions. Many people use clones for virtual
machines.
Man, I am an open storage analyst, please, tell me I am wrong!
I suggest you read the docs, particularly the ZFS Administration Guide.
http://www.opensolaris.org/os/community/zfs/docs
-- richard
zStorageAnalyst
- Original Message -
From: William D. Hathaway [EMAIL PROTECTED]
To: zfs-discuss@opensolaris.org
Sent: Saturday, December 06, 2008 11:41 PM
Subject: Re: [zfs-discuss] Hardware Raid Vs ZFS implementation on Sun
X4150/X4450
I don't understand your statement/questions. This wasn't a response to
ZFS versus every possible storage platform in the world. The original
poster was asking about comparing ZFS versus hardware RAID on specific
machines as mentioned in the title. AFAIK you don't get compression,
snapshots and clones with standard hardware RAID cards.
--
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