Thank you for suggesting to use SSD. I have been thinking about that as well, but currently, the storage of BackupPC is using a 1TB disk, with about 80% utilization.
Changing to 1TB SSD might be a little bit overkill on the customer's budget :)
On 31/10/13 13:06, Sharuzzaman Ahmat Raslan wrote:
> Hi Holger,
>
> Based on short session of troubleshooting, I believe the machine
> actually suffer from low I/O speed to the disk. Average read is about
> 3 MB/s, which I considered slow for a SATA disk in IDE emulation.
Is that under load, or while idle? If it is under load, then it might be
expected, remember throughput is very bad for HD when you have random
load due to seek times.
If it is idle and has that performance level, then there is something
wrong. Even old IDE disks could do at least 30 to 50MB/s for large
contiguous reads.
> I'm planning to suggest to the customer to have a RAID 1 setup to
> increase the I/O speed. I'm looking at possibilities to speed things
> up by not having to change the overall setup.
While RAID1 will assist in reliability and is one strategy to reduce
downtime/data loss (but it isn't a backup), it also is not going to
improve performance. With RAID1 you still need to write to both disks,
and while it is theoretically possible to balance reads across both
disks, it likely won't do that well without a proper hardware raid
controller.
Personally, my suggestion would be to consider using a SSD, since you
are using such an old drive, probably you don't need a lot of space, so
a 120GB SSD might be suitable. An SSD will handle random IO
significantly better than any one or two drive system, with much higher
transfer rates as well (there is no penalty for seek times with SSD).
Again, personally, I've used a couple of systems with 5 x 480GB Intel
520s SSD in RAID5, and they have been working really well (except they
were difficult to actually get stock of them most of this year, and I
hear they are now replaced by a new model).
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