LogicalSolutionsNZ
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IBM DS3300 (LSI 1532 Array) change controller battery
I can't find reference to this anywhere and just need someone to confirm I am correct in my assumptions with replacing controller battery's in a duel controller DS3300.
I don't think i need to take the array offline and plan to take a single controller offline, change the battery, replace the controller and then repeat on the other side.
This SAN is connected to a ESX 3.5 environment via iSCSI in a shared storage configuration with multiple paths available to the target.
Sound like a plan?
I don't think i need to take the array offline and plan to take a single controller offline, change the battery, replace the controller and then repeat on the other side.
This SAN is connected to a ESX 3.5 environment via iSCSI in a shared storage configuration with multiple paths available to the target.
Sound like a plan?
Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)
that is correct, just check you have two paths to the SAN and controllers.
Better do offline the array and change the battery to avoid the conf error.
ASKER
Any third party like to chime in here and justify either of these statements with real life experiences?
Or VRABHILASH can you validate your statement with a reference link or share your experience of the error you talk about?
Or VRABHILASH can you validate your statement with a reference link or share your experience of the error you talk about?
Let me check, this should be done for Sun BBC.
Best practice includes:
- Making sure the hardware is healthy, nothing degraded, and certainly nothing rebuilding
- Make sure it is in active/active, not active/passive. Otherwise it will go offline
- Do one at a time, make sure it is spun up.
- Don't look for trouble, this will cause some I/O retries. If anything is mission critical then realize not all operating systems and software deal well with I/O timeouts & retries. Give users a heads up.
- The battery lets the NVRAM hold a copy of the metadata. If you have not backed up the config, or there is a configuration mismatch between controllers (rare, but possible), or have power/controller failure then you have risk of data loss as the system will already be degraded.
Backup first as a precaution. Risk is low, but I've seen it happen.
- Making sure the hardware is healthy, nothing degraded, and certainly nothing rebuilding
- Make sure it is in active/active, not active/passive. Otherwise it will go offline
- Do one at a time, make sure it is spun up.
- Don't look for trouble, this will cause some I/O retries. If anything is mission critical then realize not all operating systems and software deal well with I/O timeouts & retries. Give users a heads up.
- The battery lets the NVRAM hold a copy of the metadata. If you have not backed up the config, or there is a configuration mismatch between controllers (rare, but possible), or have power/controller failure then you have risk of data loss as the system will already be degraded.
Backup first as a precaution. Risk is low, but I've seen it happen.
ASKER
The DS3300 is an active/passive array.
Yes I have experienced bad things on the occasion with SAN's too which is why I'm super careful with anything i do, always follow best practice and take every precaution possible.
Problem is there is not documented best practice for this procedure I can find.
Maybe I should just take this thing offline to do the replacement. An extra hour and a half doing that is better than trying to rebuild a storage array which has corruption because I wanted to save myself an hour.
Yes I have experienced bad things on the occasion with SAN's too which is why I'm super careful with anything i do, always follow best practice and take every precaution possible.
Problem is there is not documented best practice for this procedure I can find.
Maybe I should just take this thing offline to do the replacement. An extra hour and a half doing that is better than trying to rebuild a storage array which has corruption because I wanted to save myself an hour.
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