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8

Each drive adds its performance to the sum, so more drives will be faster than less drives, all else being equal. The size doesn't directly have an effect, though. If you have a choice between 2.5 inch 300GB 10k RPM drives and 2.5 inch 900GB 10k RPM drives, they'll perform about the same, drive for drive. The difference is when you figure it per TB. So 10 TB ...


2

A part of the reason you might want to implement a RAID array is the read speed improvement. Using only a single disk to read from, but writing to both, smells wrong. If your actual problem is that you are experiencing worse read times since replacing a disk in your RAID setup, you might want to troubleshoot that disk instead of working around it. Here ...


2

I know you can do the following in Linux LVM and can only assume that it may be possible on other OS's: Use the Volume Manager to set up your redundancy and data striping for reliability and performance. Simply use both disks as physical volumes for a LVM volume group and create a LVM logical volume with the correct redundancy and striping when setting ...


1

Although not a fix for your underlying problem, the mdadm command has the --write-mostly option: -W, --write-mostly subsequent devices listed in a --build, --create, or --add command will be flagged as 'write-mostly'. This is valid for RAID1 only and means that the 'md' driver will avoid reading from these devices if at all possible. This can be useful ...


1

Yes. More spindle = higher IOPS. Provided that the smaller drives are similar, performance-wise, to the larger drives (i.e., similar interface and similar RPM).


1

Please provide numbers detailing your expected and actual performance figures. Also, what is the SAS topology? How many SFF-8088 cables are in place between the host and the D2700 JBOD? As I mentioned earlier, the HP StorageWorks D2700 is S.M.A.R.T. aware and reports on SCSI Enclosure Services (SES) details... But your use case here is narrow. That's a ...



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