- #Dell powervault md3600i check disk health drivers
- #Dell powervault md3600i check disk health update
- #Dell powervault md3600i check disk health full
- #Dell powervault md3600i check disk health windows
#Dell powervault md3600i check disk health update
#Dell powervault md3600i check disk health drivers
If you still have access to the virtual disk that is not on preferred path, you have multipath drivers installed You will get an alert telling you that this will disrupt communications if you do not have the multipath drivers installed.To correct this you just need to manually redistribute the virtual disks back to their preferred paths.ġ.
In some cases the communication does not shift back to the primary path when it becomes available again. – the array will communicate via the alternate controller. If that path is not available – due to a network issue, controller reset, etc.
When virtual disks are created, they are assigned to one of the two controllers as a preferred communication path. The alert on the system is due to a virtual disk not being on the preferred path. Yes you can redistribute the Virtual Disks while the MD is in production see below: The goal would be to create a bunch of volumes and split them evenly between controllers.Taken from Dell website at the following url: As always if you are unsure set a maintenance window for this, The rest of the thread also states about the issue being fixed in a firmware update: Even on active/active storage systems (which I'm not sure yours is), they can have an affinity for one controller over another. Another problem with having all the storage in the same LUN is that generally, IO is sent to a single controller for that LUN. Normal operating systems have a configurable command queue depth (the number of outstanding IOs they'll line up for the storage), and each volume/LUN has its own queue. Lastly, if you have all the storage in one big volume presented as a single LUN, your command queue might be saturated. Each 7200 RPM disk will provide a certain number of IO/s when you're reading unpredictably, so the number of drives in your raid times the number of IO/s per drive will be your theoretical performance cap. If it's random small-block, you'll get low numbers of MB/s, but as many IO/s as your disks can provide. If it's sequential, you'll get a higher number of MB/s, but a lower number of IO/s. Next up, if your benchmark is measuring a mixture of reads and writes, the performance you'll get from the storage controller will depend on the type of IO. One benefit of RAID-10 is that there's no parity to calculate, so it's unlikely that the controllers' processors are simply not able to keep up. That's because each write is done to two disks, but reading is only done from one. Secondly, once the cache starts destaging data to disk, the write performance on RAID-10 (assuming that the controllers are not introducing bottlenecks) will be half that of the read performance. You can measure this fairly easily by figuring out how much cache you have and doing a 100% write benchmark with less data than that.
#Dell powervault md3600i check disk health full
First thing, assuming you have write caching enabled, all your writes until the cache is full should be done at line speed. Judging by your comments and edits, your bottleneck might be the storage. Some lines of the Swith Configuration: interface Te1/0/23Īnd multipath output: ~]# multipath -ll -v2 The array is setup as a single logical volume of 5.7TBĭisks are all 1TB 7.2k SAS 6GB (ST1000NM0001) Should I expect more than that ? Providing it has dual 10 GbE my thoughts where to come around the 400 Mb/s.Īny ideas ? Guidelines ? Troubleshooting tips ? = 262144Īfter my tests i can barely come to 200 Mb/s read/write. Prio_callout "/sbin/mpath_prio_rdac /dev/%n"Īnd nf : node.startup = automatic Getuid_callout "/sbin/scsi_id -g -u -s /block/%n" There's nothing else on the switch one VLAN for SAN traffic. The MD3600 has 2 RAID controllers, each has 2x 10GbE ethernet nics. I have a dedicated 24x 10GbE Switch (PowerConnect 8024), setup to jumbo frames 9K. Recent owner of a Dell PowerVault MD3600i i'm experiencing some weird results.