[smartmontools-support] SAS drives output

[Roy Sigurd Karlsbakk]

From: "Claudio Kuenzler" <napsty at gmail.com> 

> To: "Roy Sigurd Karlsbakk" <roy at karlsbakk.net>
> Cc: "smartmontools-support" <smartmontools-support at listi.jpberlin.de>
> Sent: Wednesday, 4 May, 2022 06:55:02
> Subject: Re: [smartmontools-support] SAS drives output

> On Wed, May 4, 2022 at 12:44 AM Roy Sigurd Karlsbakk via Smartmontools-support <
> [ mailto:smartmontools-support at listi.jpberlin.de |
> smartmontools-support at listi.jpberlin.de ] > wrote:

>> With SAS, however, its the amount of data available is a lot less [2].
> Yep. SAS (SCSI) is not ATA, therefore these are different kind of drives. The
> SMART table as you know it (with the attribute listing) is only present in ATA
> drives.

>> It's just strange - I would have thought SAS, being faster, better, more
>> expensive et cetera et cetera ad infinitum, would also deliver the same amount
>> of data over SMART or similar, but it doesn't look like that. Does SAS have an
>> alternate method of reading this out or is the data actually omitted or
>> concealed?

> Understandable, but that's just it. I doubt there is any additional data in the
> SAS drives which smartctl is not reading.

According to this post, [ https://superuser.com/questions/618736/how-do-i-interpret-smart-data-for-sas-disks, | https://superuser.com/questions/618736/how-do-i-interpret-smart-data-for-sas-disks, ] "Correction algorithm invocations" as reported by smartctl -l error could give a pointer to potential issues like those found with various other attributes on SATA. 

It also seems rewrites correlates to total corrected errors and Correction algorithm invocations except for rereads which seems to be nother story altogether. 

Short summary over the SAS drives i my system with Correction algorithm invocations > 0 

=== START OF READ SMART DATA SECTION === 
Error counter log: 
Errors Corrected by Total Correction Gigabytes Total 
ECC rereads/ errors algorithm processed uncorrected 
fast | delayed rewrites corrected invocations [10^9 bytes] errors 
============ /dev/sdo ============ 
[R] read: 1890693855 27 0 1890693882 27 561825.247 0 
[W] write: 0 0 0 0 0 274268.491 0 
============ /dev/sdq ============ 
[R] read: 1767968645 2 0 1767968647 2 563629.638 0 
[W] write: 0 0 0 0 0 265845.517 0 
============ /dev/sdu ============ 
[R] read: 1548213289 88 0 1548213377 88 13739.072 0 
[W] write: 0 0 0 0 0 22122.154 0 
============ /dev/sdv ============ 
[R] read: 3347515306 0 0 3347515306 0 556018.523 0 
[W] write: 0 0 7 7 7 269312.240 0 
============ /dev/sdah ============ 
[R] read: 3912943842 0 0 3912943842 0 657862.876 0 
[W] write: 0 0 1 1 2 1264878.422 1 
============ /dev/sdan ============ 
[R] read: 3504925953 76 0 3504926029 76 571224.984 0 
[W] write: 0 0 0 0 0 266987.398 0 
Vennlig hilsen 

roy 
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Roy Sigurd Karlsbakk 
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