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Scott, Yes, all drives in a RAID parity set must be the same capacity. Yes, you can ride out the loss of a user ASP without negative consequences to the data on the other ASP's. You're mixing the terms ASP and parity set in your note; they are not necessarily equivalent. But if ASP three is constituted entirely of those two unprotected drives, then you can lose a drive in that ASP without losing data anywhere else. Your system should stay up. Regards, Andy Nolen-Parkhouse > In reviewing one of the old systems I am responsible for, I noticed that > some 17.54gb disk units were added onto the system (as ASP 3) and are in > an > unprotected state. I think if we had added 4gb disk units in these > locations, we simply could have added them to the existing parity set, but > since they are 17.54gb they can't be added. Is this correct? > > Size % I/O Request Read > Write > Read Write % --Protection-- > Unit Type (M) Used Rqs Size (K) Rqs Rqs (K) (K) Busy > ASP Type Status > 1 6607 4194 84.8 .5 10.3 .3 .2 12.5 6.7 0 > 1 DPY ACTIVE > 2 6607 3670 84.7 .5 15.3 .3 .2 18.6 11.4 0 > 1 DPY ACTIVE > 3 6607 3670 84.7 .5 18.2 .2 .2 24.0 10.9 0 > 1 DPY ACTIVE > 4 6607 3670 85.0 .5 11.7 .3 .2 17.2 4.9 0 > 1 DPY ACTIVE > 17 6607 3145 23.8 .0 5.4 .0 .0 4.0 5.9 0 > 2 DPY ACTIVE > <snip> > 23 6714 17548 18.6 .1 56.9 .1 .0 66.8 37.4 0 > 3 > 24 6714 17548 18.6 .2 67.6 .1 .0 76.6 50.2 0 > 3 > > > What could I expect if we lost either drive 23 or 24? Can the system ride > out the loss of a user ASP? If not, and it crashes, when the failed disk > is replaced and the system is brought back up, is there any data loss in > the ASPs that *are* RAID protected? (This is a V4R4 system). > > Scott Lindstrom
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