[3dem] [External] Re: RAID question for K2/K3 users

[Morgan, David Gene]

Marin,

Their argument is indeed speed, but it raises the question of whether the drop in speed is significant or not.  That was why I was asking about the experiences of people who might have tried this.


--
    politics is more difficult than physics.
                                             A. Einstein

            David Gene Morgan
        Electron Microscopy Center
             047E Simon Hall
             IU Bloomington
          812 856 1457 (office)
          812 856 3221 (3200)
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From: Marin van Heel <marin.vanheel at gmail.com>
Sent: Thursday, February 29, 2024 6:12 PM
To: Morgan, David Gene <dagmorga at indiana.edu>
Cc: 3dem at ncmir.ucsd.edu <3dem at ncmir.ucsd.edu>
Subject: [External] Re: [3dem] RAID question for K2/K3 users


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Dear David
The reason for a RAID-0 rather a RAID-5 is undoubtedly the higher I/O speed and not primarily a matter of company policy...
Cheers
Marin

On Thu, 29 Feb 2024, 20:00 Morgan, David Gene, <dagmorga at indiana.edu<mailto:dagmorga at indiana.edu>> wrote:
Hi,

We had an issue with a disk in the RAID array on our K3 last week.  It fortunately turned out to be a non-fatal error, but it did make me realize that this is a RAID0 array and that a real disk error could result in troublesome loss of data.

I asked a Gatan engineer who is here installing a system on a new microscope about switching to RAID5 or RAID6.  His comment was that company policy is RAID0 only, but that he didn't see any reason other than a loss in write speed that could result from switching RAID type.

Has anyone changed the RAID on a Gatan computer to something else, and if so, have you had any issues?

Thanks in advance.
--
    politics is more difficult than physics.
                                             A. Einstein

            David Gene Morgan
        Electron Microscopy Center
             047E Simon Hall
             IU Bloomington
          812 856 1457 (office)
          812 856 3221 (3200)
      https://urldefense.com/v3/__http://iubemcenter.indiana.edu__;!!Mih3wA!CVzCzG5A7RQhL67-8HLUSblVLI7iyjMciQ7CznlSytGavMYkXi3y_0H041vTj8xwdq1hFTyH9JAnMBvoHT4ORdg$ <https://urldefense.com/v3/__http://iubemcenter.indiana.edu__;!!Mih3wA!HV1p7q8MKM90aKMVu_thfmzPEZhCpnNSu2mSsEobLxBK-wFl1HMD93m6ng71u3LxL3bVhcQ4rn7F5N8s6icWnzw$>
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