HDDs protected or unprotected?

65 pts.
Tags:
AS/400 hardware
AS/400 storage
HDD
i5/OS
Hello, After upgrading an existing 8203-E4A machine (i5/OS, V5R4M5) with 2x139 HDDs feature code #3677, i see in the "Work with disk units-> Display Disk Configuration Protection" that the model of disk units added are 090. The array is RAID5 and have 6 HDDs. 3 HDDs are 099, 2 HDDs are 090 and 1 is hotspare. Does it mean that this 2 HDDs added to the ASP1, doesn't contain parity bits? Are they protected? (i mean if one of them have problems will the array protected again?) Info: When i see from strsst "Work with Disk Units" in "Display Device Parity Status" i see them active, also in "Display Disk Hardware Status" i see them RAID-5/Active. If you need more details, please let me know.

Software/Hardware used:
2 #3667 HDDs 139.5 GB 15k RPM
ASKED: June 20, 2011  2:33 PM
UPDATED: June 21, 2011  7:56 PM

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  • TomLiotta
    After upgrading an existing 8203-E4A machine ... with 2x139 HDDs Just to be certain, did you already have a 3-disk RAID-5 set that you wanted to add two disks to? Or did you add two disks to three existing disks and then attempt to start RAID-5 over all five disks at one time? If you started with a 3-disk set, I don't think you can "add" two disks to it. I believe you have to stop RAID-5, then start it over all five. (That would seem to be your best course.) The two new disks may be waiting for one more in order to start a second 3-drive set. Tom
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  • Infoko
    Hello, I initialized the 2 disks and followed the procedures from the ibm site: http://publib.boulder.ibm.com/infocenter/powersys/v3r1m5/index.jsp?topic=/iphal_p5/cifconfigonos400.htm It was 4 disk since the begining (3 RAID5 + 1 Hotspare) after the above action now re 6 disk (5 seems to be RAID5 1 is hotspare). It was no problem to include 2 unit in paity set, it was succesfull. What i want to be sure is that are this 2 HDDs added protected or no, since their model show 090, that means no parity. Tom as i know 2 HDDs are ok to add, more than 2 you should stop parity and start again, or create a new parity set. Please give me some suggestions. Thnx,
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  • TomLiotta
    It was 4 disk since the begining (3 RAID5 + 1 Hotspare)... We need comment from someone who has experience with that configuration. I see that as a 3-drive set as far as my understanding goes; but I can imagine a method of having a hot-spare participate in parity even while it's not participating in other I/O... I suppose. To me, it wouldn't make sense having a fourth drive configured as a hot-spare in a 4-drive set. The implication is that after it was activated (and the failing disk was removed), the result would be a functional 4-drive set, which is clearly not sensible. I suggest that you get IBM to clarify the exact meaning of your original setup, assuming that no one here has worked with that configuration. Tom
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