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May
16
answered Swap being used when RAM is almost half free
Jan
4
awarded  Enlightened
Jan
4
awarded  Nice Answer
Jan
4
comment Postfix server begins send spam immediately after starting
postsuper -d ALL deletes all mails in your queue. Handle with care, if there might me other, non-spam messages in your queue too.
Jan
4
comment When reading SSD drive specs, what's the difference between MB/s and IOPS?
@HBruijn: I didn't state it, but for me it was clear that in a HP server you should only run drives that are supported by HP for that server. Regarding your number 2) - if a sector of a drive would fail exactly after X write cycles, you'd be right. But it does not. Some sectors fail after X-20%, some at X, some at X+20%. Generally, there is no hard limit for X. Failed sectors are indeed replaced as long as sectors are available. This is done by the SSD controller in the drive. If there are no more sectors available, the drive stops working and is probably dead. Then you have a mirror.
Jan
4
revised When reading SSD drive specs, what's the difference between MB/s and IOPS?
added 556 characters in body
Jan
4
comment When reading SSD drive specs, what's the difference between MB/s and IOPS?
Yes, you're right. If we talk about solaris, illumos and Oracle, I'd recommend ZFS as well. There is no need for a hardware raid controller.
Jan
4
comment When reading SSD drive specs, what's the difference between MB/s and IOPS?
ZFS can be a solution, but is probably not an enterprise solution as you don't get any support. It's not included in the mainline kernel, although it's easy to integrate it. I can only recommend strongly against mdraid (linux software raid). It delivers a fairly high throuput but fails miserably in high IOPS scenarios. Of course you should not go for a $20 Raid Controller if you want to max out SSD drives. The Controllers should be in a position to handle the IOPS and drives like the top ARECA or LSI Controllers (840.000 IOPS, Dual Core CPUs) can.
Jan
4
answered When reading SSD drive specs, what's the difference between MB/s and IOPS?
Jan
4
answered should multiple servers each run a full postfix stack, or use one central mail server
Jan
4
comment Delete the contents of a huge directory in CentOS 6.6
sure, just put a "* */12 * * * root find /var/www/html/secured/cookies -type f -delete" in /etc/cron.d/deletecookies
Dec
31
comment How to configure Postfix to only send out emails with a certain header?
What do you mean by "it should be left alone"? Should that mail be delivered to the target system according to the MX entries of the target mail address? Or should it be discarded? Or something else? Can you post your main.cf?
Dec
24
answered postfix/policyd-weight[11026]: warning: child: could not open RBL Lookup Socket to config
Dec
20
answered Share /home between datacenters
Dec
20
comment postfix always_BCC mail system configuration error
This error seems to be related to dovecot only. Postfix forwards all mails to the dovecot transport defined in master.cf (which you haven't posted as far as I can see). If I understood correctly, incoming mail gets handled correctly? That's strange, possibly it just has to do how dovecot handles the sender address?
Dec
8
awarded  Yearling
Sep
24
awarded  Autobiographer
Sep
11
awarded  Revival
Dec
8
awarded  Yearling
Jun
24
comment How to block sending mail from domain in postfix?
if that domain is still hacked, you should fight the root cause and disable that domain completely. it will be hacked again quite fast.