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NetComrade
9 Posts
0
724
October 29th, 2009 08:00
CX4-480 Vault Disks
Can someone point me to documentation what happens when a vault disk is lost in this model? (I believe ours is called NS4-480, perhaps because it comes with a NAS)
We recently lost one in a CX500, and it was not pretty (write cache got disabled, and emc support didn't instruct us to just use one of existing available drives to replace it, and disk got rebuilt twice--first to spare, then back to vault before we got write cache back, which took a good 4 hours)
We recently lost one in a CX500, and it was not pretty (write cache got disabled, and emc support didn't instruct us to just use one of existing available drives to replace it, and disk got rebuilt twice--first to spare, then back to vault before we got write cache back, which took a good 4 hours)
chiodp
149 Posts
150
0
Posted October 29th, 2009 09:00
Due to the new Persistent memory features only present in the CX4 write cache will stay enable in the following scenarios :
- Power supply or fan failures
- Single SPS failure
- Single vault drive failure
- Single SP failure or SP restart
For you old CX500 you can unflag the HA vault option this will allow the write cache to stay enable also if one of the disk in the vault failed .
Because the CX500 has no Persistent Memory Features Frequently , the data is at risk if another cache vault disk should fail.
For more info please refer to the following FAQ for CX4:
Frequently Asked Questions: Q3 2009 Mid-tier Storage Launch for Virtual Environments
http://powerlink.emc.com/km/live1/en_US/Offering_Basics/FAQ/Q309Mid-tierStorageLaunchFAQs.doc?mtcs=ZXZlbnRUeXBlPUttQ2xpY2tDb250ZW50RXZlbnQsZG9jdW1lbnRJZD0wOTAxNDA2NjgwNDYzM2YxLGRvY3VtZW50VHlwZT1tc3c4LG5hdmVOb2RlPTBiMDE0MDY2ODAzNGFlYzFfR3JpZA__