[Info-vax] Reclaim disk space for a 3PAR Storage Box

[Simon Clubley]

On 2021-08-30, Dave Froble <davef at tsoft-inc.com> wrote:
> On 8/30/2021 1:44 PM, Simon Clubley wrote:
>>
>> SSDs make me nervous because when they fail, they tend to fail hard
>> and sudden without any warning.
>
> Never seen a total head crash on a HDD?  Ok, neither have I, but I have 
> seen HDDs fail, and once they start, you cannot count on getting 
> accurate data off them.
>

Yes, I have actually (back as a student). Saw what happens when a
head decides to make contact with a platter on a removable disk pack. :-)

In modern times, yes I have had multiple HDDs fail but the usual levels
of redundancy have saved me so far. You cannot count on that with SSDs
however. Here's a couple of examples from your favourite vendor:

https://www.theregister.com/2019/11/25/hpe_ssd_32768/
https://www.theregister.com/2020/03/25/hpe_ssd_death_fix/

Imagine if your VMS cluster had those (and only those) installed as
part of a HBVS setup and then you walked in the next day and found that
every single drive, including all cluster-wide redundant backups, had all
failed at pretty much the same time and that you couldn't recover the data.

Like I said, SSDs make me nervous.

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Walking destinations on a map are further away than they appear.