Short answer is yes.  The power down procedure is to turn off both SPS’s (the UPS batteries) and let the array power itself down. The array will vault the cache to disk and power off. If you want to commit all dirty pages to their actual disks, rather than to vault, I’d disable write cache and wait for it to complete. It will go to “disabling” for a while during which time it’s flushing data to disk, then switch to “disabled”. Then you can power off the SPS’s and let the array power down.  On power up, be sure that all of the DAEs (except the O-O enclosure) are powered up before you power on the SPSs. Once it’s fully online, check and enable write cache.
Currently, we have a Raid 1/0 Stripe Meta-LUN composed from the following Raid Groups/Disks.  RG2, Bus0, Enclosure0, Disk 5 - 8 = 525 GB Raid 1/0 LUN RG4, Bus0, Enclsoure0, Disk 9 - 12 = 525 GB Raid 1/0 LUN RG6, Bus2, Enclosure5, Disk 0 - 3 = 525 GB Raid 1/0 LUN RG8, Bus2, Enclosure5, Disk 4 - 7 = 525 GB Raid 1/0 LUN  As you can imagine the Meta-LUN is a 2100 GB LUN.  We need to power down the array.  My concern is that fact that the Stripe Meta-LUN has components on Bus0, Enclosure0.  Please keep in mind all SAN servers will obviously be shut down prior to shutting down the array.  Will this cause an issue?  Thanks,  Damian
Raid 1/0 Meta-LUNs on Bus0, Enclosure0. Can I power down the Array?