From: "Patrick H." <linux-raid@feystorm.net>
To: linux-raid <linux-raid@vger.kernel.org>
Subject: Re: filesystem corruption
Date: Wed, 05 Jan 2011 08:55:17 -0700 [thread overview]
Message-ID: <4D249465.3060103@feystorm.net> (raw)
In-Reply-To: <4D2493A4.9010209@shiftmail.org>
HP DL360-G6. SAS controller with battery backed write accelerator.
I havent been focusing on the reliability of the drives as this is proof
of concept testing. If we decide to use it, the drives will be replaced
with 2TB SSD PCIe cards.
-Patrick
Sent: Wed Jan 05 2011 08:52:04 GMT-0700 (Mountain Standard Time)
From: Spelic <spelic@shiftmail.org>
To: Patrick H. <linux-raid@feystorm.net> linux-raid
<linux-raid@vger.kernel.org>
Subject: Re: filesystem corruption
> On 01/05/2011 03:28 PM, Patrick H. wrote:
>> No, my drives are battery backed as well.
>
> what drives are they, if I can ask? OCZ SSDs with supercapacitor maybe?
>
> Do you know if they will really flush the whole write cache on sudden
> power off? I read smoky sentences about this for the OCZ drives. In
> certain points it seemed like the supercapacitor was only able to
> provide the same guarantees of a HDD, that is, no further data loss
> due to erase-then-rewrite-32K and flash wear levelling stuff, but was
> not able to flush the write cache.
> Did you try with e.g. a stream of simple databases transactions then
> disconnecting the cable suddenly like this test
> http://www.mysqlperformanceblog.com/2009/03/02/ssd-xfs-lvm-fsync-write-cache-barrier-and-lost-transactions/
>
> ?
>
> Thank you
prev parent reply other threads:[~2011-01-05 15:55 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-03 1:58 filesystem corruption Patrick H.
2011-01-03 3:16 ` Neil Brown
[not found] ` <4D214B5C.3010103@feystorm.net>
2011-01-03 4:56 ` Neil Brown
2011-01-03 5:05 ` Patrick H.
2011-01-04 5:33 ` NeilBrown
2011-01-04 7:50 ` Patrick H.
2011-01-04 17:31 ` Patrick H.
2011-01-05 1:22 ` Patrick H.
2011-01-05 7:02 ` CoolCold
[not found] ` <AANLkTinL_nz58f8rSPuhYvVwGY5jdu1XVkNLC1ky5A65@mail.gmail.com>
2011-01-05 14:28 ` Patrick H.
2011-01-05 15:52 ` Spelic
2011-01-05 15:55 ` Patrick H. [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4D249465.3060103@feystorm.net \
--to=linux-raid@feystorm.net \
--cc=linux-raid@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).