mikkydoos Posted February 17, 2017 Posted February 17, 2017 (edited) Hi all, I'll be VM'ing our physical main file server soon - currently 12TB capacity over 8 disks on a RAID5 array. I'll be putting extra hard disks in my host, creating a new array and a new datastore for that VM to fill up. My hypervisor machine only has RAID0 and RAID1 on the controller. HP HDD's for my server at the moment are: 4TB - £220 6TB - £770 If I create a RAID1 array can I make it larger than the capacity of the disk? e.g. If I put in four 4TB disks can I make an array of 8TB? Server is an HP Proliant 360p Gen 8 with the standard HP Smart Array P420i controller I'm pretty sure I can't but I'm throwing it out there...... Cheers in advance Edited February 17, 2017 by mikkydoos
kmount Posted February 17, 2017 Posted February 17, 2017 If the controller supports RAID10 you can put your 4x4TB in and get the 8TB you're talking about yep. (the P420 looks like it does https://www.hpe.com/h20195/v2/GetPDF.aspx/c04111534.pdf ) Be careful moving from 8 disks down to 4, you might have a performance impact to factor in. 1
Norphy Posted February 17, 2017 Posted February 17, 2017 Hi all, I'll be VM'ing our physical main file server soon - currently 12TB capacity over 8 disks on a RAID5 array. I'll be putting extra hard disks in my host, creating a new array and a new datastore for that VM to fill up. My hypervisor machine only has RAID0 and RAID1 on the controller. HP HDD's for my server at the moment are: 4TB - £220 6TB - £770 If I create a RAID1 array can I make it larger than the capacity of the disk? e.g. If I put in four 4TB disks can I make an array of 8TB? Server is an HP Proliant 360p Gen 8 with the standard HP Smart Array P420i controller I'm pretty sure I can't but I'm throwing it out there...... Cheers in advance No. RAID 1 is mirroring. What you're describing there sounds more like RAID 10, a mirror of striped disks.
bwestlake Posted February 17, 2017 Posted February 17, 2017 If you have two 4tb disks: RAID1 - 4TB (Redundant) RAID0 - 8TB (NON Redundant) Is that what your asking?
mikkydoos Posted February 17, 2017 Author Posted February 17, 2017 If you have two 4tb disks: RAID1 - 4TB (Redundant) RAID0 - 8TB (NON Redundant) Is that what your asking? No. I want to make a RAID1 array larger than the size of each single disk. I think I need RAID 10. If the controller supports RAID10 you can put your 4x4TB in and get the 8TB you're talking about yep. (the P420 looks like it does https://www.hpe.com/h20195/v2/GetPDF.aspx/c04111534.pdf ) Be careful moving from 8 disks down to 4, you might have a performance impact to factor in. Didn't think of disk performance yet. Good point. My onboard controller only has RAID0 and RAID1. I think I might need a new controller.
kmount Posted February 17, 2017 Posted February 17, 2017 Are you sure it's only RAID0 and RAID1? How many disks have you got plugged in right now? It might not show you RAID10 until you have 4 plugged in. 1
mikkydoos Posted February 17, 2017 Author Posted February 17, 2017 Are you sure it's only RAID0 and RAID1? How many disks have you got plugged in right now? It might not show you RAID10 until you have 4 plugged in. I don't think so. I've only got 3 in at the moment. Two mirrored and a spare.
PotNoodleTech Posted February 17, 2017 Posted February 17, 2017 I had to read that a couple of times to try and get exactly what you are asking. I think I understand now. The answer is no. Assuming your raid controller explicitly only supports raid 0 or raid 1 - Classic Raid 1 only allows you to use two disks in a mirror. To use multiple pairs of disks in raid 1 your controller needs to support a hybrid raid 1 mode - Raid 01 for two pairs of raid 1 mirror disks in a raid 0 stripe, or RAID 10 for two pairs of raid 0 stripes in a mirror. Need to find out exactly what your controller supports - it may well support RAID10/01 in which case you can do what you need to do (all 4 disks to create one 8TB mirror) 1
3s-gtech Posted February 17, 2017 Posted February 17, 2017 Without checking the quickspecs as I'm in a rush, the P420 should be able to do RAID 10 without breaking a sweat. We have G5 and G7 servers with their contemporary controllers fitted, all doing RAID 10. 2
mikkydoos Posted March 2, 2017 Author Posted March 2, 2017 Must be the number of disks in it at present. Some on the way.... lets see
Oaktech Posted March 2, 2017 Posted March 2, 2017 (edited) Grabbed from the HPE spec sheet... RAID Support RAID 6, 60 (Advanced Data Guarding) NOTE: RAID 6, 60 can be enabled with a minimum of 512 MB FBWC RAID 5, 50 (Distributed Data Guarding) NOTE: A minimum or 512 MB cache is required to enable RAID 5, 50 support of the Smart Array P420i RAID 1, 10 (Drive Mirroring) RAID 1 ADM, 10 ADM (Advanced Data Mirroring) RAID 0 (Striping) Edited March 2, 2017 by Oaktech 1
supawat1 Posted March 2, 2017 Posted March 2, 2017 I have HP ML380p Gen8 with P420i RAID Controller and for sure, it supports RAID10 and RAID 1. You can create multiple group of RAIDs 1, 5 and 10, the only limitation you have is the enclosure to hold HDDs. 1
mikkydoos Posted March 2, 2017 Author Posted March 2, 2017 I have HP ML380p Gen8 with P420i RAID Controller and for sure, it supports RAID10 and RAID 1. You can create multiple group of RAIDs 1, 5 and 10, the only limitation you have is the enclosure to hold HDDs. Great info. Thanks @supawat1 Looks like I'm good to go. Thanks for the posts guys
mikkydoos Posted March 2, 2017 Author Posted March 2, 2017 I have HP ML380p Gen8 with P420i RAID Controller and for sure, it supports RAID10 and RAID 1. You can create multiple group of RAIDs 1, 5 and 10, the only limitation you have is the enclosure to hold HDDs. Great info. Thanks @supawat1 Looks like I'm good to go. Thanks for the posts guys
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