Re: mdadm raid1 read performance

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 04/05/11 13:30, Drew wrote:

It seemed logical to me that if two disks had the same data and we
were reading an arbitrary amount of data, why couldn't we split the
read across both disks? That way we get the benefits of pulling from
multiple disks in the read case while accepting the penalty of a write
being as slow as the slowest disk..



I would have thought as you'd be skipping alternate "stripes" on each disk you minimise the benefit of a readahead buffer and get subjected to seek and rotational latency on both disks. Overall you're benefit would be slim to immeasurable. Now on SSD's I could see it providing some extra oomph as you suffer none of the mechanical latency penalties.

--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux RAID Wiki]     [ATA RAID]     [Linux SCSI Target Infrastructure]     [Linux Block]     [Linux IDE]     [Linux SCSI]     [Linux Hams]     [Device Mapper]     [Device Mapper Cryptographics]     [Kernel]     [Linux Admin]     [Linux Net]     [GFS]     [RPM]     [git]     [Yosemite Forum]


  Powered by Linux