Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

When you have a RAID controller managing an array over a large amount of disks in an external chassis with a SAS expander, what happens if someone accidentally powers off the external chassis or accidentally unplugs the cable? What's the worst and most likely cases in terms of data integrity in the array?

share|improve this question

closed as not constructive by BMDan, TheCleaner, mdpc, mgorven, Hauke Laging Jun 1 '13 at 1:51

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

Things break badly and people are upset at you and perhaps loss of sleep. – mdpc May 31 '13 at 19:13
up vote 4 down vote accepted

That's why SFF-8088 external SAS cables have locking connectors... That's also why external JBOD power switches are purposely hard to reach and typically require a long press to engage.

Given that, you're asking the same question as, "What would happen if I pulled a group of disks out of a running system?"

The answer is probably data loss, frustration and downtime... Don't let it happen.

  • Note, expanders are usually in the backplanes of external JBOD enclosures.
share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.