Archives for storage - Page 3
DO NOT TRY IT IN PRODUCTION. USE AT YOUR OWN RISK!
Good news... here you can get a little script to enable, disable, and check the disksort flag on your disks (not persistent after reboot, take a look on my other post to a link for how to do it).
Take ...
DO NOT TRY IT IN PRODUCTION. USE AT YOUR OWN RISK!
In my last post i did write about some issues related with disksort:
1) Performance (Latency)
2) Consistency
In my D Script i'm printing the buf sector when the sd driver receives it. So, without sorting.
That's important because i'm ...
Hello there, this will be a long post... so, i think if you have no time to waste, think again before you go ahead.
And, no. I'm not Morpheus, so i cannot offer you the truth. Actually, i can just offer you my doubts. And no pills, i do ...
In my last post about 'Performance', i did talk about a ZFS tuning parameter: zfs_prefetch_disable. And that was a ZFS read parameter...
In this post, we will take a look in another one, with the same 'water to wine' effect. This time with focus on writes...
We have a set ...
Hello there...
I think you agree that the storage's problem is the READ requests, synchronous by nature. And, as i said many times before, i think the solution for all problems (the answer for all questions ;-) is cache. Many levels, many flavors.
I did read many times about the ...
These days i was working to understand a workload: random, many small files (e.g: web servers), running on NFS/ZFS environment.
Interesting to see that the discs were really busy, a very heavy random workload, but a few NFS reads and writes requests. On top of it, an idle SSD as a ...
PLEASE BE AWARE THAT ANY INFORMATION YOU MAY FIND HERE MAY BE INACCURATE, AND COULD INCLUDE TECHNICAL INACCURACIES, TYPOGRAPHICAL ERRORS, AND EVEN SPELLING ERRORS.
From the MANUAL page:
The zdb command is used by support engineers to diagnose
failures and gather statistics. Since the ZFS file ...
These days i was invited to do a presentation about Open Storage and ZFS on two Oracle/Sun events here in Brazil. One in Rio de Janeiro, and another here at São Paulo. Well, it was very interesting, first because i did live in Rio de Janeiro (1998/1999), and is ...