11/8/2022 0 Comments Drive snapshot raid 5![]() ![]() Your system is a single redundant system so uses RAID-10 and RAID-5-9. So for us the snapshot mechanism is purely there to aid data progression. This is ok for us as we do not need or intend to revert the storage to a previous point in history. We have found that frequent snapshots (every 2 hours) with short expiry times (2 hours), maintains a high rate of data progression from RAID-10 to RAID-6, whilst only keeping one snapshot at any time. A good set-up is going to depend largely on what your workloads are like. DRIVE SNAPSHOT RAID 5 SERIESI can highly recommend reading this, if you haven't already : Understanding RAID with Dell SC Series Storage - Dell Engineering - September 2016īasically that snapshot is MASSIVE, far bigger than it would normally be. Removing the Datastore associated with the old Volume. Copy all the stuff we wanted over from the old to the new Volume(Datastore). Create new vSphere Datastores in the new Volume. The only way we've found of getting rid of it easily was to create a new Volume. There must be a notice or maybe you havent change the state from setup/maintenance back up production. There is no Blockstorage which nows which data are deleted by a Host because the Host neededs to tell this to the storage.ītw: I can see a yellow flag on your SC. i think its a HighWatermark and as long you dont run the space reclamation/scsi unmap in an ESX/Datastore this values never decreased again. Dell support can fix that.Ībout the % allocated for the Disk. mostlikely on Tier1 RAID10 because you have import huge amount of data trough your Tier1. I have seen sometimes that the SC allocates on the wrong place. The SC "allocate" space because the system needs to be prepared that maybe data needs to be writen. We enable the Snapshots AFTER the migration During the VM migration we create a custom StorageProfile or using Import to lowest Tier to be sure that our mass Data goes into a RAID5/6 If we deliver and setup a SC for a customer Some ppl use SAN snapshot during the day and VM Backup in the night and place Data on a different Storage. Think about whats happend if a crypto trojaner comes into your environment you need to restore a huge VM You wanna be prepare for a mass restore. Otherwise it can takes up to 12 days before changing Tiers For Dataprogression(only when have 2 or more tiers) and Autotiering OnDemand. It can be part of the your DR strategy of course or your Backupproduct can read the data from the san snapshot for performance reasons. You should be careful that the SAN doesn't go into emergency mode, as this will impact all other LUNs on the SAN and prevent hosts and VMs writing new data t them too.Īnd what is the advantage if the data goes from Raid 10 to Raid5?īecause "old" data takes less space on a RAID5 compared to RAID10.ĭo you suggest not making snapshots but using another backup tool?Ī storage snapshot is not a backup. Take a look at the "Disks" section of the "Storage" tab in the DSM, I suspect you'll see the disks are nearly full. You have to remember the Dell SC is ALWAYS thin provisioned, so it is very easy to define LUNS (Dell SC Volumes) that add up to more than the amount of physical storage available. ![]() This suggests that the problem is not with your LUN, but the underlying array. It shows that your LUN (700GB) has very little space used (only about 500MB). Your screen shot is not the whole picture. If your application shows no noticeable benefit to having tier-1 RAID-10, you might also consider using a profile that writes directly to RAID-5/6. If you are not using Dell SC snapshots to restore your systems to a previous point in time, you could consider creating your own storage profile, so you only have one snapshot in existence at any one time. The snapshots on the Dell SC are used as mechanism to allow data progress from being stored at RAID-10 to RAID-5 or RAID-6 (depending on whether you are using single or dual disk redundancy). ![]()
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