HPE Storage Users Group

A Storage Administrator Community




Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: drive enclosure replacement
PostPosted: Fri Jan 08, 2021 2:43 pm 

Joined: Wed Aug 21, 2013 11:40 pm
Posts: 30
I have an 8400 with 12 drive cages, is it possible to replace a drive enclosure online without shutting the array completely down ?

I have moved all PD's data that reside on the cage but concerned if cage is removed before new cage is inserted will the other cages still be able to process data.


Top
 Profile  
Reply with quote  
 Post subject: Re: drive enclosure replacement
PostPosted: Sat Jan 09, 2021 12:47 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 1191
Location: Europe
trireed wrote:
I have an 8400 with 12 drive cages, is it possible to replace a drive enclosure online without shutting the array completely down ?

I have moved all PD's data that reside on the cage but concerned if cage is removed before new cage is inserted will the other cages still be able to process data.


If the system is correctly configured and healthy, all cages are connected thru two paths/loops which are reversed. An unrealistic example would be:

Loop1: node -> cage 1 -> cage 2 -> cage 3 -> cage 4
Loop2: node -> cage 4 -> cage 3 -> cage 2 -> cage 1

Lets say you remove cage 2, cage 1 is still connected thru Loop1 and cage 3 and 4 thru Loop2.

So replacing an empty cage (keep in mind that an empty cage is unsupported) is no problem. With you have HA cage you can also replace a cage without removing the disks first.

_________________
The views and opinions expressed are my own and do not necessarily reflect those of my current or previous employers.


Top
 Profile  
Reply with quote  
 Post subject: Re: drive enclosure replacement
PostPosted: Sat Jan 09, 2021 12:57 pm 
User avatar

Joined: Tue Oct 07, 2014 8:34 am
Posts: 197
Hi,
we have removed two Times a Drive Cage (and Dives) online.
After unalloc and dismiss PDs we use:

showcage
servicecage remove -f cage
showcage
checkhealth

Cali


Top
 Profile  
Reply with quote  
 Post subject: Re: drive enclosure replacement
PostPosted: Thu Jan 14, 2021 10:57 am 

Joined: Wed Aug 21, 2013 11:40 pm
Posts: 30
Cali, so we replaced cage and all the original drives are now showing failed in the new cage, in my case cage12, they were in cage11 which was removed.

all drives were unalloc and also servicemag start was ran on each PD to move data off prior to removing cage11. All drives show normal on cage, firmware is current on cage. If you do a showpd though all drives are failed state.

Wondering if we are missing something here, we tried servicemag resume on each drive and all completed successfully but drives still showing failed state which is odd since it seems to be using drives. Looking for a way to reset drive status out of the failed state?


Top
 Profile  
Reply with quote  
 Post subject: Re: drive enclosure replacement
PostPosted: Thu Jan 14, 2021 2:27 pm 

Joined: Wed Aug 21, 2013 11:40 pm
Posts: 30
Found my answer !

If a drive has a failed status but you know drive is good, like what happened to me due to a cage replacement you can clear the error by issuing:

controlpd clearerr wwn

This is not documented in CLI reference since its a hidden command for support.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 


Who is online

Users browsing this forum: Bing [Bot] and 18 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group | DVGFX2 by: Matt